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Description

This is SMPS Controller.

The UC3842 / UC3843 / UC3844 / UC3845 are fixed frequencycurrent-mode PWM controller. They are specially designed for Off-Line and DC to DC converter applications with minimum external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator and a high current totempole output for driving a Power MOSFET.

Features

1. Low Start up Current

2. Maximum Duty Clamp

3. UVLO With Hysteresis

4. Operating Frequency up to 500KHz

Part Number: UC3843

Description

Current-Mode PWM Controller

Package: SOIC 8, SOIC14, PDIP 8, CFP 8 Pin Type

Manufacturer: Texas Instruments

Image

Description

This is Single ended 500KHz current mode PWM controller.

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: https://www.ti.com/product/UC3843