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Selection Guides

 

General Power Supply

Table Listing of Power Supply Selection Guides
Current Mode Controllers Resonant Mode Controllers
Current Mode Controllers (Special Features) Special Function Circuits
Current Mode Lighting Controllers Supply Monitors & Active Clamps
Power Supply Support Products Voltage Mode Controllers

Current Mode Controllers
(1 of 11 tables, see below)

Unitrode Part Number
UCC3305 # UCC3800 UCC3801 UCC3802 UCC3803
Application Constant Power HID Lamp Controller DC-DC and Battery DC-DC and Battery Off-line DC-DC and
Battery
Topology Boost, Flyback Buck, Boost Buck, Boost Forward, Flyback Buck, Boost
Voltage Reference Tolerance 2% 1.5% 1.5% 1.5% 1.5%
Peak Output Current 0.5A 1A 1A 1A 1A
Maximum Practical Operating Frequency 500kHz 1MHz 1MHz 1MHz 1MHz
Outputs 3 - Single and Dual Alternating, Totem Pole Single, Totem Pole Single, Totem Pole Single, Totem Pole Single, Totem Pole
Startup Current   100mA 100mA 100mA 100mA
Leading Edge Blanking   Y Y Y Y
Soft Start   Y Y Y Y
Maximum Duty Cycle   100% 50% 100% 100%
Separate Oscillator/ Synchronization Terminal          
Application/Design Note U-161 DN-65, U-133A DN-65, U-133A DN-42A,  DN-65, U-133A DN-43, DN-48, DN-54, DN-56, DN-65, U-133A

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
# Does Not Feature UVLO

 

Current Mode Controllers
(2 of 11 tables, see below)

Unitrode Part Number
UCC3804 UCC3805 UCC3806 UCC3807 + UCC3808 +
Application Off-line DC-DC and Battery Isolated Output, Push-pull Controller Off-line, DC-DC and Battery Off-line, DC-DC
Topology Forward, Flyback Forward, Flyback Push-pull, Full Bridge, Half Bridge Forward, Flyback Buck, Boost Push-pull, Full Bridge, Half Bridge
Voltage Reference Tolerance 1.5% 1.5% 1% 1.5%   2%
Peak Output Current 1A 1A 0.5A 1A  0.5A Source, 1A Sink
Maximum Practical Operating Frequency 1MHz 1MHz 1MHz 1MHz   1MHz
Outputs Single, Totem Pole Single, Totem Pole Dual Alternating, Totem Pole  Single, Totem Pole  Dual Alternating, Totem Pole
Startup Current 100mA 100mA 100mA 100mA 130mA
Leading Edge Blanking Y Y   Y  
Soft Start Y Y Y Y Y
Maximum Duty Cycle 50% 50% 50%/50% Programmable 50%/50%
Separate Oscillator/ Synchronization Terminal     Y    
Application/Design Note DN-65, U-133A DN-46, DN-65, U-133A DN-45, DN-51,
DN-65, U-144		 DN-65 DN-65

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

 

Current Mode Controllers
(3 of 11 tables, see below)

Unitrode Part Number
UCC3809 + UCC3810 UCC3813-0 + UCC3813-1 + UCC3813-2 +
Application Isolated Off-line, DC-DC Primary Controller Dual PWM Controller, Off-line, DC-DC DC-DC and Battery  DC-DC and Battery Off-line
Topology Forward, Flyback, Buck, Boost Forward, Flyback Buck, Boost Buck, Boost Buck, Boost Forward, Flyback
Voltage Reference Tolerance 5% 1.5% 1.5% 1.5% 1.5%
Peak Output Current 0.4A Source, 1A Sink 1A 1A 1A 1A
Maximum Practical Operating Frequency 1MHz 1MHz 1MHz 1MHz 1MHz
Outputs Single, Totem Pole Dual, Totem Pole Single, Totem Pole Single, Totem Pole Single, Totem Pole
Startup Current 100mA 150mA 100mA 100mA 100mA
Leading Edge Blanking   Y Y Y Y
Soft Start Y   Y Y Y
Maximum Duty Cycle 90% 50% 100% 50% 100%
Separate Oscillator/ Synchronization Terminal N/A Y      
Application/Design Note DN-65 DN-65 DN-65, U-133A DN-65, U-133A DN-65, U-133A

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

 

Current Mode Controllers
(4 of 11 tables, see below)

Unitrode Part Number
UCC3813-3 + UCC3813-4 + UCC3813-5 + UC3823 UC3823A
Application DC-DC and Battery Off-line DC-DC and Battery DC-DC DC-DC
Topology Buck, Boost Forward, Flyback Forward, Flyback Buck, Boost Buck, Boost
Voltage Reference Tolerance 1.5% 1.5% 1.5% 1% 1%
Peak Output Current 1A 1A 1A 1.5A 2A
Maximum Practical Operating Frequency 1MHz 1MHz 1MHz 1MHz 1MHz
Outputs Single, Totem Pole Single, Totem Pole Single, Totem Pole Single, Totem Pole Single, Totem Pole
Startup Current 100mA 100mA 100mA 1.1mA 0.1mA
Leading Edge Blanking Y Y Y   Y
Soft Start Y Y Y Y Y
Maximum Duty Cycle 100% 50% 50% 100% Programmable
Separate Oscillator/ Synchronization Terminal       Y Y
Application/Design Note DN-65, U-133A DN-65, U-133A DN-65, U-133A U-131 U-128

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

 

Current Mode Controllers
(5 of 11 tables, see below)

Unitrode Part Number
UC3823B UC3824 UC3825 UC3825A UC3825B
Application Off-line Synchronous Rectifier, Forward Converter DC-DC DC-DC Off-line
Topology Buck, Boost Forward, Flyback Push-pull, Full Bridge, Half Bridge Push-pull, Full Bridge, Half Bridge Push-pull, Full Bridge, Half Bridge
Voltage Reference Tolerance 1% 1% 1% 1% 1%
Peak Output Current 2A 1.5A 1.5A 2A 2A
Maximum Practical Operating Frequency 1MHz 1MHz 1MHz 1MHz 1MHz
Outputs Single, Totem Pole Dual Complementary, Totem Pole Dual Alternating, Totem Pole Dual Alternating, Totem Pole Dual Alternating, Totem Pole
Startup Current 0.1mA 1.1mA 1.1mA 0.1mA 0.1mA
Leading Edge Blanking Y     Y Y
Soft Start Y Y Y Y Y
Maximum Duty Cycle Programmable 100% 50%/50% Programmable Programmable
Separate Oscillator/ Synchronization Terminal Y Y Y Y Y
Application/Design Note U-128   U-110 U-128 U-128

 

Current Mode Controllers
(6 of 11 tables, see below)

Unitrode Part Number
UC3826 @ UC3827 + UCC3829 + UCC3839 @ UC3841
Application Secondary Side, Average Current Mode Multiple Output or High Voltage Output DC-DC Converters Off-line, DC-DC Secondary Side, Average Current Mode Control Off-line, DC-DC
Topology Forward, Flyback, Buck, Boost Buck Current Fed
or Voltage Fed, Push-pull		 Buck, Boost, Push-pull, Full Bridge, Half Bridge Any Topology Forward, Flyback, Buck, Boost
Voltage Reference Tolerance 1% 4% 1% 1% 1%
Peak Output Current 0.25A Floating 1A for Buck Stage, 0.8A for Push-pull Drivers 2.2A 10mA to Drive Opto-coupler 1A
Maximum Practical Operating Frequency 1MHz 500kHz 1MHz 1MHz 500kHz
Outputs Single, Totem Pole Floating Buck, Push-pull Dual Alternating, Totem Pole Opto-coupler Drive Single, Open Collector
Startup Current   1mA 200mA   4.5mA
Leading Edge Blanking N/A        
Soft Start Y Y Y   Y
Maximum Duty Cycle Programmable 90% for Buck Stage, 50%/50% for Push-pull Stage 50%/50%   Programmable
Separate Oscillator/ Synchronization Terminal Y Y Y    
Application/Design Note     DN-65   DN-28

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
@ Pulse- by-Pulse Current Limiting Not Applicable
+ New Product

 

Current Mode Controllers
(7 of 11 tables, see below)

Unitrode Part Number
UC3842 UC3842A UC3843 UC3843A UC3844
Application Off-line Off-line DC-DC DC-DC Off-line
Topology Forward, Flyback, Buck, Boost Forward, Flyback Buck, Boost Forward, Flyback Buck, Boost Forward, Flyback Buck, Boost Forward, Flyback Buck, Boost
Voltage Reference Tolerance 1% 1% 1% 1% 1%
Peak Output Current 1A 1A 1A 1A 1A
Maximum Practical Operating Frequency 500kHz 500kHz 500kHz 500kHz 500kHz
Outputs Single, Totem Pole Single, Totem Pole Single, Totem Pole Single, Totem Pole Single, Totem Pole
Startup Current 1mA 0.5mA 1mA 0.5mA 1mA
Leading Edge Blanking          
Soft Start          
Maximum Duty Cycle 100% 100% 100% 100% 50%
Separate Oscillator/ Synchronization Terminal          
Application/Design Note DN-27, DN-40, U-100A DN-27, DN-29, DN-40 DN-30, U-100A DN-27, DN-29, DN-40 U-100A

 

Current Mode Controllers
(8 of 11 tables, see below)

Unitrode Part Number
UC3844A UC3845 UC3845A UC3846 UC3847
Application Off-line DC-DC DC-DC Off-line, DC-DC Off-line, DC-DC
Topology Forward, Flyback Buck, Boost Forward, Flyback Buck, Boost Forward, Flyback Buck, Boost Push-pull, Full Bridge, Half Bridge Push-pull, Full Bridge, Half Bridge
Voltage Reference Tolerance 1% 1% 1% 1% 1%
Peak Output Current 1A 1A 1A 0.5A 0.5A
Maximum Practical Operating Frequency 500kHz 500kHz 500kHz 500kHz 500kHz
Outputs Single, Totem Pole Single, Totem Pole Single, Totem Pole Dual Alternating, Totem Pole Dual Alternating, Totem Pole
Startup Current 0.5mA 1mA 0.5mA    
Leading Edge Blanking          
Soft Start       Y Y
Maximum Duty Cycle 50% 50% 50% 50%/50% 50%/50%
Separate Oscillator/ Synchronization Terminal       Y Y
Application/Design Note DN-27, DN-29, DN-40 U-100A DN-27, DN-29, DN-40 DN-45, U-93, U-100A U-93

 

Current Mode Controllers
(9 of 11 tables, see below)

Unitrode Part Number
UC3848 @ UC3849 @ UC3851 UC3856 UC3875
Application Average Current Mode, Off-line, DC-DC Secondary Side, Average Current Mode Off-line, Programmable, Primary Side Isolated Output, Push-pull Controller Zero Voltage Transition, Phase Shifted Bridge
Topology Forward, Flyback Forward, Flyback, Buck, Boost Forward, Flyback, Buck, Boost Push-pull, Full Bridge, Half Bridge Full Bridge
Voltage Reference Tolerance 1% 1% 1% 1% 1%
Peak Output Current 2A 0.25A 0.2A 1.5A 2A
Maximum Practical Operating Frequency 1MHz 1MHz 500kHz 1MHz 1MHz
Outputs Single, Totem Pole Single, Totem Pole Single, Totem Pole Dual Alternating, Totem Pole Quad, Phase Shifted, Totem Pole
Startup Current 500mA   4.5mA   150mA
Leading Edge Blanking N/A N/A      
Soft Start   Y Y Y Y
Maximum Duty Cycle Programmable Programmable 50% 50%/50% 100%
Separate Oscillator/ Synchronization Terminal   Y   Y Y
Application/Design Note U-135, U-140 U-140 DN-28 DN-45 DN-63, U-136

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
@ Pulse- by-Pulse Current Limiting Not Applicable

 

Current Mode Controllers
(10 of 11 tables, see below)

Unitrode Part Number
UC3876 UC3877 UC3878 UC3879 UCC3883
Application Zero Voltage Transition, Phase Shifted Bridge Zero Voltage Transition, Phase Shifted Bridge Zero Voltage Transition, Phase Shifted Bridge Zero Voltage Transition, Phase Shifted Bridge Primary Side Controller for ISDN Applications
Topology Full Bridge Full Bridge Full Bridge Full Bridge Flyback
Voltage Reference Tolerance 1% 1% 1% 1% 1%
Peak Output Current 2A 2A 2A 0.1A 0.7A
Maximum Practical Operating Frequency 1MHz 1MHz 1MHz 300kHz 400kHz
Outputs Quad, Phase Shifted, Totem Pole Quad, Phase Shifted, Totem Pole Quad, Phase Shifted, Totem Pole Quad, Phase Shifted, Totem Pole Single
Startup Current 150mA 150mA 150mA 150mA  
Leading Edge Blanking         Y
Soft Start Y Y Y Y Y
Maximum Duty Cycle 100% 100% 100% 100% 50%
Separate Oscillator/ Synchronization Terminal Y Y Y Y Y
Application/Design Note DN-63, U-136 DN-63, U-136 DN-63, U-136 DN-63, U-136, U-154 U-139

 

Current Mode Controllers
(11 of 11 tables)

Unitrode Part Number
UCC3884 + UCC3885
Application Off-Line or DC-DC Frequency Foldback Controller Secondary Side Regulator for ISDN Applications
Topology Forward, Flyback, Buck, Boost Flyback
Voltage Reference Tolerance 2% 1%
Peak Output Current 0.5A Source, 1A Sink N/A
Maximum Practical Operating Frequency 750kHz 400kHz
Outputs Single Single
Startup Current 200mA  
Leading Edge Blanking   Y
Soft Start Y Y
Maximum Duty Cycle 80% 50%
Separate Oscillator/ Synchronization Terminal Y Y
Application/Design Note DN-65, U-164  

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

< top >

Current Mode Controllers
Special Features
(1 of 2 tables, see below)		 Unitrode Part Number
UCC3830 + UC3870 @ UC3874 @ UCC3880 +
Application Microprocessor Power Synchronous Rectifier, Average Current Mode Synchronous Rectifier, Average Current Mode Microprocessor Power
Topology Buck Buck Buck Buck
Voltage Reference Tolerance 1%* 2% 2% 1%*
Peak Output Current 1.5A 1A 1A 1.5A
Maximum Practical Operating Frequency 100kHz/200kHz/ 400kHz 300kHz 300kHz 100kHz/200kHz/ 400kHz
Outputs Single Dual, Totem Pole Dual, Totem Pole Single
Soft Start   Y Y  
Average Current Mode Y Y Y Y
Foldback Current Limiting Y     Y
Maximum Duty Cycle 95% 100% 100% 95%
Special Features 5 Bit Programmable Output Voltage, UV/OV Monitor External Reference Input Down to 1.5V Low Power Standby Mode 4 Bit Programmable Output Voltage, UV/OV Monitor

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
@ Pulse- by-Pulse Current Limiting Not Applicable
+ New Product

 

Current Mode Controllers
Special Features (2 of 2 tables)

Unitrode Part Number
UCC3881 + UCC3882 + UC3886 +
Application Microprocessor Power Microprocessor Power Microprocessor Power
Topology Buck Synchronous Buck Buck
Voltage Reference Tolerance 1% 1%* 1.5%
Peak Output Current 1.5A 1.5A 1.5A
Maximum Practical Operating Frequency 100kHz/200kHz/ 400kHz 700kHz 400kHz
Outputs Single Dual, N-FET Drive Single
Soft Start      
Average Current Mode Y Y Y
Foldback Current Limiting Y Y  
Maximum Duty Cycle 95% 95% 95%
Special Features   5 Bit Programmable Output Voltage, UV/OV Monitor External Reference Input,
Use with UC3910
Application/Design Note     U-156, U-157

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

< top >

Current Mode Lighting Controllers

Unitrode Part Number
UCC3305 UC3871 UC3872
Application Constant Power HID Lamp Controller Zero Voltage Switched Fluorescent Lamp Driver with LCD Bias Supply Zero Voltage Switched Fluorescent Lamp Driver
Topology Boost, Flyback Push-Pull Push-pull
Voltage Range 5V to 18V 4.5V to 20V 4.5V to 24V
Reference Tolerance 2% 1.2% 1.2%
Open Lamp Detect Y Y Y
Soft Start Y Y Y
External Synchronization Y Y Y
Shutdown Current N/A 1mA 1mA
Maximum Frequency 200kHz 200kHz 200kHz
Lamp Intensity Control Y Y Y
Application/Design Note DN-65, U-161 DN-75, U-141, U-148 DN-75, U-141, U-148

 

Voltage Mode Controllers
(1 of 8 tables, see below)

Unitrode Part Number
UC3524 # UC3524A UC3525A UC3525B UC3526
Application Fixed Frequency PWM, Off-line, DC-DC Fixed Frequency PWM, Off-line, DC-DC Fixed Frequency PWM, Off-line, DC-DC Fixed Frequency PWM, Off-line, DC-DC Fixed Frequency PWM, Off-line, DC-DC
Topology Forward, Flyback, Buck, Boost Forward, Flyback, Buck, Boost Full Bridge, Half Bridge Full Bridge, Half Bridge Full Bridge, Half Bridge
Voltage Reference Tolerance 4% 1% 1% 0.75% 1%
Peak Output Current 100mA 200mA 400mA 200mA 100mA
Maximum Practical Operating Frequency 300kHz 500kHz 500kHz 500kHz 400kHz
Outputs Dual Alternating, Uncommitted Dual Alternating, Uncommitted Dual Alternating, Totem Pole Dual Alternating, Totem Pole Dual Alternating, Totem Pole
Startup Current   4mA      
Voltage Feedforward          
Soft Start     Y Y Y
Maximum Duty Cycle 50%/50% 50%/50% 50%/50% 50%/50% 50%/50%
Separate Oscillator/ Synchronization Terminal Y Y Y Y Y
Application/Design Note       DN-36  

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
# Does Not Feature UVLO

 

Voltage Mode Controllers
(2 of 8 tables, see below)

Unitrode Part Number
UC3526A UC3527A UC3527B UC3548 UCC3570
Application Fixed Frequency PWM Off-line, DC-DC Fixed Frequency PWM, Off-line, DC-DC Fixed Frequency PWM, Off-line, DC-DC Off-line, DC-DC Wide Range, Off-line
Topology Full Bridge,
Half Bridge		 Full Bridge, Half Bridge Full Bridge, Half Bridge Flyback, Forward Forward, Flyback, Buck, Boost
Voltage Reference Tolerance 1% 1% 0.75% 1% 1%
Peak Output Current 100mA 400mA 200mA 2A 500mA
Maximum Practical Operating Frequency 550kHz 500kHz 500kHz 1MHz 500kHz
Outputs Dual Alternating, Totem Pole Dual Alternating, Totem Pole Dual Alternating, Totem Pole Single, Totem Pole Single, Totem Pole
Startup Current       500mA 85mA
Voltage Feedforward       Y Y
Soft Start Y Y Y Y Y
Maximum Duty Cycle 50%/50% 50%/50% 50%/50% Programmable 100%
Separate Oscillator/ Synchronization Terminal Y Y Y    
Application/Design Note     DN-36   DN-65, U-150

 

Voltage Mode Controllers
((3 of 8 tables, see below)

Unitrode Part Number
UC3572 UC3573 UC3578 + UCC3580 $ + UCC3581 +
Application Low Power, High Efficiency, Spot Regulator Low Power, High Efficiency, Spot Regulator DC-DC Active Clamp/ Reset PWM Off-line, Primary Side PWM for ISDN Applications
Topology Negative Output Flyback Buck Buck Forward, Flyback Forward, Flyback
Voltage Reference Tolerance 2% 2% 2% 1.5% 1.5%
Peak Output Current 0.5A 0.5A 0.6A Source, 0.8A Sink 1A / 0.5A 1A
Maximum Practical Operating Frequency 300kHz 300kHz 100kHz Internal Oscillator 1MHz 100kHz
Outputs Single, Totem Pole Single, Totem Pole Single, Floating Totem Pole Dual Complementary, Totem Pole Single, Totem Pole
Startup Current     N/A 50mA 100mA
Voltage Feedforward       Y  
Soft Start     Y Y Y
Maximum Duty Cycle 100% 100% 90% Programmable Programmable
Separate Oscillator/ Synchronization Terminal       Y Y
Application/Design Note   DN-70     DN-65

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
$ Sleep Current
+ New Product

 

Voltage Mode Controllers
(4 of 8 tables, see below)

Unitrode Part Number
UCC3582 + UCC3583 + UC3584 + UC3823 UC3823A
Application High Efficiency DC-DC Secondary Side Post Regulation DC-DC Secondary Side Synchronous Post Regulator DC-DC DC-DC
Topology Synchronous Buck Buck Buck Buck, Boost Buck, Boost
Voltage Reference Tolerance 1.5% 1.5% 1% 1% 1%
Peak Output Current 0.5A 1.5A Source, 0.5A Sink 1.5A Source and Sink 1.5A 2A
Maximum Practical Operating Frequency 500kHz 500kHz 1MHz 1MHz 1MHz
Outputs Dual Complementary, Totem Pole Single, Totem Pole Single, Totem Pole Single, Totem Pole Single, Totem Pole
Startup Current 15mA* 100mA N/A 1.1mA 0.1mA
Voltage Feedforward Y N/A   Y Y
Soft Start Y Y Y Y Y
Maximum Duty Cycle 100% 95% 94% 100% Programmable
Separate Oscillator/ Synchronization Terminal   Y Y Y Y
Application/Design Note DN-65     U-131 U-128

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

 

Voltage Mode Controllers
(5 of 8 tables, see below)

Unitrode Part Number
UC3823B UC3824 UC3825 UC3825A UC3825B
Application Off-line Synchronous Rectifier, Forward Converter DC-DC DC-DC Off-line
Topology Buck, Boost Forward, Flyback Push-pull, Full Bridge, Half Bridge Push-pull, Full Bridge, Half Bridge Push-pull, Full Bridge,Half Bridge
Voltage Reference Tolerance 1% 1% 1% 1% 1%
Peak Output Current 2A 1.5A 1.5A 2A 2A
Maximum Practical Operating Frequency 1MHz 1MHz 1MHz 1MHz 1MHz
Outputs Single, Totem Pole Dual Complementary, Totem Pole Dual Alternating, Totem Pole Dual Alternating, Totem Pole Dual Alternating,
Totem Pole
Startup Current 0.1mA 1.1mA 1.1mA 0.1mA 0.1mA
Voltage Feedforward Y     Y Y
Soft Start Y Y Y Y Y
Maximum Duty Cycle Programmable 100% 50%/50% Programmable Programmable
Separate Oscillator/ Synchronization Terminal Y Y Y Y Y
Application/Design Note U-128   U-110 U-128 U-128

 

Voltage Mode Controllers
(6 of 8 tables, see below)

Unitrode Part Number
UC3827 + UCC3829 + UC3841 UC3851 UC3875
Application Multiple Output or High Voltage Output DC-DC
Converters		 Off-line, DC-DC Primary Side, Programmable, Off-line, DC-DC Off-line, Programmable, Primary Side Controller Zero Voltage Transition, Phase Shifted Bridge
Topology Buck Current Fed or Voltage Fed, Push-pull Buck, Boost, Push-pull, Full Bridge, Half Bridge Forward,Flyback, Buck, Boost Forward, Flyback, Buck, Boost Full Bridge
Voltage Reference Tolerance 4% 1% 1% 1% 1%
Peak Output Current Floating 1A for Buck Stage, 0.8A For Push-pull Drivers 2.2A 1A 0.2A 2A
Maximum Practical Operating Frequency 500kHz 1MHz 500kHz 500kHz 1MHz
Outputs Floating Buck, Push-pull Dual Alternating,
Totem Pole		 Single, Open Collector Single, Totem Pole Quad Phase Shifted, Totem Pole
Startup Current 1mA 200mA 4.5mA   150mA
Voltage Feedforward Y Y Y Y  
Soft Start Y Y Y Y Y
Maximum Duty Cycle 90% for Buck Stage, 50%/50% for Push-pull Stage 50%/50% Programmable 50% 100%
Separate Oscillator/ Synchronization Terminal Y Y     Y
Application/Design Note   DN-65 DN-28 DN-28 DN-63, U-136

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

 

Voltage Mode Controllers
(7 of 8 tables, see below)

Unitrode Part Number
UC3876 UC3877 UC3878 UC3879
Application Zero Voltage Transition, Phase Shifted Bridge Zero Voltage Transition, Phase Shifted Bridge Zero Voltage Transition, Phase Shifted Bridge Zero Voltage Transition, Phase Shifted Bridge
Topology Full Bridge Full Bridge Full Bridge Full Bridge
Voltage Reference Tolerance 1% 1% 1% 1%
Peak Output Current 2A 2A 2A 0.1A
Maximum Practical Operating Frequency 1MHz 1MHz 1MHz 300kHz
Outputs Quad Phase Shifted,
Totem Pole		 Quad Phase Shifted, Totem Pole Quad Phase Shifted, Totem Pole Quad Phase Shifted,
Totem Pole
Startup Current 150mA 150mA 150mA 150mA
Voltage Feedforward        
Soft Start Y Y Y Y
Maximum Duty Cycle 100% 100% 100% 100%
Separate Oscillator/ Synchronization Terminal Y Y Y Y
Application/Design Note DN-63, U-136 DN-63, U-136 DN-63, U-136 DN-63, U-136, U-154

 

Voltage Mode Controllers
(8 of 8 tables)

Unitrode Part Number
UCC3888 + UCC3889 UCC3890 +
Application Off-line Power Supply Controller Off-line Power Supply Controller Off-line Battery Charge Controller
Topology Flyback Flyback Flyback
Voltage Reference Tolerance 3% 3% 4%
Peak Output Current 0.15A 0.15A 0.15A
Maximum Practical Operating Frequency 250kHz 250kHz 250kHz
Outputs Single, Totem Pole Single, Totem Pole Single, Totem Pole
Startup Current 150mA 150mA  
Voltage Feedforward Y Y Y
Soft Start      
Maximum Duty Cycle 55% 55% N/A
Separate Oscillator/ Synchronization Terminal      
Application/Design Note DN-59, U-149 DN-59, U-149  

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

< top >

Resonant Mode Controllers
(1 of 3 tables, see below)

Unitrode Part Number
UC3824 UC3852 > UC3855 UC3860 UC3861 UC3862
Application Synchronous Rectifier, Zero Voltage Transition, Forward Power Factor Correction, Zero Current Transition Power Factor Correction, Zero Voltage Transition Off-line, DC-DC, Zero Current Switching Off-line, Zero Voltage Switching DC-DC and Battery, Zero Voltage Switching
Topology Forward, Flyback Boost Boost Half Bridge, Full Bridge Half Bridge, Full Bridge Forward, Flyback
Voltage Reference Tolerance 1% 7% 1% 1% 1% 1%
Peak Output Current 1.5A 0.5A 1.5A 2A 1A 1A
Maximum Practical Operating Frequency 1MHz 250kHz 500kHz 2MHz 1MHz 1MHz
Outputs Dual Complementary, Totem Pole Single Dual Soft Switching, Totem Pole Dual Programmable, Totem Pole  Dual Alternating, Totem Pole Single, Totem Pole
Startup Current 1.1mA 1mA 150mA 300mA 150mA 150mA
Maximum Duty Cycle 100% N/A 100% Programmable 50%/50% 100%
Separate Oscillator/ Synchronization Terminal Y N/A Y Y    
Application/Design Note     U-153A   U-122, U-138 U-122, U-138

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
> Does Not Feature Soft Start

 

Resonant Mode Controllers
(2 of 3 tables, see below)

Unitrode Part Number
UC3863 UC3864 UC3865 UC3866 UC3867 UC3868
Application DC-DC and Battery, Zero Voltage Switching DC-DC and Battery, Zero Voltage Switching Off-line, Zero Current Switching Off-line, Zero Current Switching DC-DC and Battery, Zero Current Switching DC-DC and Battery, Zero Current Switching
Topology Half Bridge, Full Bridge Forward, Flyback Half Bridge, Full Bridge Forward, Flyback Half Bridge, Full Bridge Forward, Flyback
Voltage Reference Tolerance 1% 1% 1% 1% 1% 1%
Peak Output Current 1A 1A 1A 1A 1A 1A
Maximum Practical Operating Frequency 1MHz 1MHz 1MHz 1MHz 1MHz 1MHz
Outputs Dual Alternating, Totem Pole Single, Totem Pole Dual Alternating, Totem Pole Single, Totem Pole Dual Alternating, Totem Pole Single, Totem Pole
Startup Current 150mA 150mA 150mA 150mA 150mA 150mA
Voltage Feedforward 50%/50% 100% 50%/50% 100% 50%/50% 100%
Maximum Duty Cycle            
Separate Oscillator/ Synchronization Terminal            
Application/Design Note U-122, U-138 U-122, U-138 U-122 U-122 U-122 U-122

 

Resonant Mode Controllers
(3 of 3 tables)

Unitrode Part Number
UC3875 UC3876 UC3877 UC3878 UC3879
Application Zero Voltage Transition, Phase Shifted Bridge Zero Voltage Transition, Phase Shifted Bridge Zero Voltage Transition, Phase Shifted Bridge Zero Voltage Transition, Phase Shifted Bridge Zero Voltage Transition, Phase Shifted Bridge
Topology Full Bridge Full Bridge Full Bridge Full Bridge Full Bridge
Voltage Reference Tolerance 1% 1% 1% 1% 1%
Peak Output Current 2A 2A 2A 2A 0.1A
Maximum PracticalOperating Frequency 1MHz 1MHz 1MHz 1MHz 300kHz
Outputs Quad Phase Shifted, Totem Pole Quad Phase Shifted, Totem Pole Quad Phase Shifted, Totem Pole Quad Phase Shifted, Totem Pole Quad Phase Shifted, Totem Pole
Startup Current 150mA 150mA 150mA 150mA 150mA
Maximum Duty Cycle 100% 100% 100% 100% 100%
Separate Oscillator/ Synchronization Terminal Y Y Y Y Y
Application/Design Note DN-63, U-136 DN-63, U-136 DN-63, U-136 DN-63, U-136 DN-63, U-136, U-154

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Power Supply Support Products
(1 of 5 tables, see below)

Unitrode Part Number
UC2577 UC3610 UC3611 UC3612
Description Simple Step-up Voltage Regulator Dual Schottky Diode Bridge Quad Schottky Diode Array Dual Schottky Diode
Application 3 Amp Step-up Switching Regulator for Boost, Flyback, and Forward Converter Applications Eight-diode Array for High Current, Low Duty Cycle Flyback Voltage Clamping for Inductive Loads Four-diode Array for High Current Bridges and Voltage Clamps Two-diode Array for High Current, Low Duty Cycle Flyback Voltage Clamping for Inductive Loads
Key Features
  • Circuit Requires Few  External Components
  • NPN Output Switches 3A
  • Current Mode     Operation for    Improved Response
  • Fixed and Adjustable     Output Versions  Available
  • Monolithic Eight-diode Array
  • High Peak Current
  • Low Forward  Voltage
  • Fast Recovery Time
  • Matched, Four-diode    Monolithic Array
  • High Peak Current
  • Low Forward Voltage
  • Parallelable for Higher Current or Lower Voltage Drop
  • Monolithic Two-diode Array
  • High Peak Current
  • Low Forward Voltage
  • Fast Recovery Time
Application/Design Note DN-49      

 

Power Supply Support Products
(2 of 5 tables, see below)

Unitrode Part Number
UCC3750 + UCC3751 UCC3752 + UCC3812 +
Description Source Ringer Controller Single Line Ring Generator Controller Mulit-Line Ring Generator Controller 12V Boost Regulator
Application 4 Quadrant Flyback Controller Develops High Voltage AC Output Controls Low Cost Circuit for Generating High Voltage AC Output with DC Offset Controls Low Cost Circuit for Generating High Voltage AC Output with DC Offset 12V Bias Supplies
Key Features
  • On Chip Low THD Sinewave Reference, Pin Selectable 20Hz, 25Hz, and 50Hz
  • Programmable Output     Amplitude and DC Offset
  • AC and DC Current Limiting With Short Circuit Protection
  • Off-hook Detection With   Automatic Transition to DC Operation
  • Pin Selectable 20Hz, 25Hz, and 50Hz Output Frequency
  • Operates From a Single 12V Supply
  • AC Current Limiting and   Short Circuit Protection
  • Off-hook Detection and Indication
  • Pin Selectable 20Hz, 25Hz, and 50Hz Output Frequency
  • Operates From a Single 12V Supply
  • AC Current Limiting and   Short Circuit Protection
  • Fixed 12V Output
  • 3V to 5V Input Voltage
  • Minimal External Components Required

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

 

Power Supply Support Products
(3 of 5 tables, see below)

Unitrode Part Number
UCC3831 + UC3901 UC3902 +
Description Universal Serial Bus Hub Power Controller Isolated Feedback Generator 8-Pin Load Share Controller
Application Powers Four 5V Peripherals and One 3.3V USB Controller Amplitude Modulation System Used to Couple a Control Signal Across a Voltage Isolation Barrier Allows Multiple Independent Power Supplies to be Paralleled so that Each Unit Supplies Only its Proportional Share of Total Load Current
Key Features
  • Fully USB Compliant
  • Separate Power Enables
  • 500mA Current Limit for Each 5V Output
  • 100mA Current Limit for 3.3V Output
  • 6V to 9V Input Voltage Range
  • Transformer Couples Isolated Feedback Error Signal
  • Low Cost Alternative to   Optical Couplers
  • 5MHz Carrier Provides Fast Response Capability
  • Modulator Synchronizable to an External Clock
  • Highly Tolerant of Voltage  Differences Between Power Supply Return
  • 2.7V to 20V Operation
  • High Gain, Low Offset Current Sense Amplifier Permits Low Shunt Resistor Values
  • Single Capacitor Sets Load Share Filter Response
Application/Design Note   DN-19, DN-33, U-94 U-163

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

 

Power Supply Support Products
(4 of 5 tables, see below)

Unitrode Part Number
UC3907 UC3908 UC3910 +
Description Load Share Controller Voltage Clamp Reference, 4-bit DAC and Fault Monitor
Application Allows Multiple Independent Power Supplies to be Paralleled so that Each Unit Supplies Only its Proportional Share of Total Load Current Protects a Power Supply Load in the Event of an Overvoltage Sets Control Voltage for UC3886, UC3870 and other Precision PWMS
Key Features
  • Fully Differential High Impedance Voltage Sensing
  • Accurate Current Amplifier for Precise Load Sharing
  • Optocoupler Driving Capability
  • 4.5V to 35V Operation
  • Shunt Regulator Keeps Power Supply Overvoltage to a Predetermined Level by Clamping the Power Supply Output
  • Programmable Input Voltage from 3V to 10V
  • Up to 10A Shunt Regulator  Automatically Activated
  • Gate Drive to External SCR Provided if Fault Persists
  • 4-bit DAC Sets Output Voltage of PWM, Meets Intel VID Code
  • 1% Combined Reference and DAC Tolerance
  • Over and Under Voltage   Monitoring and Protection
Application/Design Note U-129 DN-69 U-157, U-158

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

 

Power Supply Support Products
(5 of 5 tables)

 Unitrode Part Number
UC39431 UC39432 UC3965 +
Description Precision Adjustable Shunt Regulator Precision Analog Controller Precision Reference with Low Offset Error Amplifier
Application Adjustable 100mA Shunt Regulator, Voltage Reference Optocoupler Driver, Voltage to Current Converter Adjustable 100mA Shunt Regulator, Optocoupler Driver, Programmable Transconductance Voltage to Current Converter Used for High Precision PWM Switching Regulators
Key Features
  • Multiple On-chip Programmable Reference Voltages
  • 2.2V to 36V Operating Supply Voltage and User Programmable Reference
  • Linear Transconductance for Optocoupler Feedback  Applications
  • Programmable, Linear     Transconductance for Optimum Optocoupler Current Drive
  • Precision Reference and Error Amplifier Inputs Externally Available
  • 2.2V to 36V Operating Supply Voltage and User  Programmable Reference
  • 2.5V Precision Reference with 0.4% Accuracy
  • Low 1mV Offset Error Amplifier
  • 2X Inverting Amplifier/ Buffer Output
  • Drivers Optocoupler Diode for Isolated Applications
Application/Design Note   DN-52  

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

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Supply Monitors &
Active Clamps

Unitrode Part Number
UC3543 UC3544 UC3903 UC3904 UC3908 UC3910 +
Power Supply Monitor  Single  Single Quad Quad   Single
Voltage Clamp         Single  
Voltage Range 5V to 35V 5V to 35V 8V to 40V 4.75V to 18V 3V to 10V 8V to 12V
Window Adjust N N Y Y N Y
Current Range         0A to 10A  
Current Limit Y Y N N N N
Programmable Threshold Y Y Y Y Y Y
Programmable Time Delay Y Y Y Y N Y
Application/Design Note     DN-33   DN-69 U-157, U-158

All products feature Pulse-by-Pulse Current Limiting and UVLO unless otherwise noted.
+ New Product

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Special Function Circuits

Unitrode Part Number
UC161A/B/C UC3730 UC3838A UC494/5A,AC
Part Name Quad Micropower Comparator Thermal Monitor Mag-Amp Controller PWM
Description Contains Four High Gain, Programmable Speed CMOS Compatible Comparators with Microwatt Operation Combines a Temperature Transducer, Precision Reference, and Temperature Comparator for Maximum System Flexibility Dual Op-amps and 1% Reference with -120V Reset Driver for Magnetic Amplifier Control Applications Versatile PWM Featuring Dual 40V “Floating” Output Transistors and Dual Error Amplifiers for Single and Dual Ended Uses
Application/Design Note     DN-47, U-109 DN-38

Last updatd: 05/21/98