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Description

SD4840 / SD4841 / SD4842 / SD4843 / SD4844 is a current mode PWM controller with low standby power and low start current for power switch. In standby mode, the circuit enters burst mode to reduce the standby power dissipation.

Pinout

The switch frequency is 67KHz with ±2.5 KHz jitter frequency for low EMI.

Block Diagram

Features

1. Lower start-up current (Typ.6μA)

2. Frequency jitter for low EMI* Overcurrent protection

3. Overvoltage protection

4. Undervoltage lockout

5. Built-in temperature protection

6. Built-in high voltage MOSFET

7. Cycle by cycle current limit