UC2845D
Features
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 1 m A)
- Automatic feedforward pensation
- Pulse-by-pulse current limiting
- Enhanced load-response characteristics
- Undervoltage lockout with hysteresis
- Double-pulse suppression
- High-current totem-pole output
- Internally trimmed bandgap reference
- Up to 500-k Hz operation
- Error amplifier with low output resistance
2 Applications
- Switching regulators of any polarity
- Transformer-coupled DC-DC converters
3 Description
The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external ponents. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 m A, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a...
