UC3844B SMD CURRENT MODE PWM IC
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 components. The internally implemented circuits include an under voltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.
Key Features:
- Current Mode Control: Ensures stable and accurate power regulation
- Fixed Frequency Operation: Reduces EMI and improves efficiency
- Low Start-up & Operating Current: Optimized for energy-saving applications
- High-Speed PWM Switching: Enables fast and precise power conversion
- Undervoltage Lockout (UVLO): Protects circuits from low voltage damage
- Leading Edge Blanking: Minimizes switching noise for cleaner signals
- Short Circuit & Overload Protection: Increases system reliability
- Compact SMD Package: Suitable for space-saving PCB designs
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