Part Number : UC3843
Description : Current-Mode PWM Controller
Package : SOIC 8, SOIC14, PDIP 8, CFP 8 Pin Type
Manufactures : Texas Instruments
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Description
The UC3843 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 undervoltage 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.
Pinout
Features
1. Optimized for Off-Line and DC-to-DC Converters
2. Low Start-Up Current (< 1 mA)
3. Automatic Feedforward Compensation
4. Pulse-by-Pulse Current Limiting
5. Enhanced Load-Response Characteristics
6. Undervoltage Lockout With Hysteresis
7. Double-Pulse Suppression
8. High-Current Totem-Pole Output
9. Internally Trimmed Bandgap Reference
10. Up to 500-kHz Operation
11. Error Amplifier With Low Output Resistance
Official Homepage : http://www.ti.com/product/UC3843
