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PFC Controllers
| Power Factor Correction Products (1 of 2 tables, see below) |
Unitrode Part Number |
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| UC3852 | UC3853 | UC3854 | UC3854A | UC3854B | |
| Soft Switching | ZCT | ||||
| Maximum Practical Operating Frequency | Variable | 125kHz | 200kHz | 200kHz | 200kHz |
| Current Error Amplifier Bandwidth | N/A | 1MHz | 800kHz | 5MHz | 5MHz |
| Average Current Mode | Y | Y | Y | Y | |
Worldwide AC Input Voltage Operation |
Y | Y | Y | Y | |
Output Drive |
0.5A | 1A | 1A | 1A | 1A |
Startup Current |
1mA | 0.25mA | 1.5mA | 0.3mA | 0.3mA |
Undervoltage Lockout |
16.3V/11.5V | 11.5V/9.5V | 16V/10V | 16V/10V | 10.5V/10V |
Overvoltage Protection |
Y | ||||
Enable Input |
Y | Y | Y | ||
Multiplier/Divider Feedforward |
N/A | Y | Y | Y | Y |
Special Features |
8-Pin | 8-Pin | |||
| Application/Design Note | U-132 | U-159 | DN-39E, DN-41, U-134 | DN-44, DN-66 | DN-44, DN-66 |
Power Factor Correction Products |
Unitrode Part Number |
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UCC3857 + |
UCC3858 + |
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Soft Switching |
ZVT |
ZVT |
ZCT |
|
Maximum Practical Operating Frequency |
500kHz |
500kHz |
500kHz |
500kHz |
Current Error Amplifier Bandwidth |
5MHz |
5MHz |
5MHz |
5MHz |
Average Current Mode |
Y |
Y |
Y |
Y |
Worldwide AC Input Voltage Operation |
Y |
Y |
Y |
Y |
Output Drive |
1.5A |
1.5A |
1A |
0.5A |
Startup Current |
0.15mA |
0.15mA |
0.06mA |
0.1mA |
Undervoltage Lockout |
16V/10V |
10.5V/10V |
13.8V/10V |
13.8V/10V |
Overvoltage Protection |
Y |
Y |
Y |
|
Enable Input |
Y |
Y |
Y |
|
Multiplier/Divider Feedforward |
Y |
Y |
Y |
Y |
Special Features |
Current Synthesizer |
Current Synthesizer |
Isolated Output |
Improved Efficiency at Light Load |
| Application/Design Note | DN-66, U-153 | DN-66, U-153 | ||
+ New Product |
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Last updatd: 05/21/98