SD4840 Overview
SD4840/4841/4842/4843/4844 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. The switch frequency is 67KHz with ±2.5 KHz jitter frequency for low EMI.
SD4840 Key Features
- Lower start-up current (Typ.6μA)
- Frequency jitter for low EMI
- Overcurrent protection
- Overvoltage protection
- Undervoltage lockout
- Built-in temperature protection
- Built-in high voltage MOSFET
- Auto restart mode
- Built-in soft start
- Burst mode operation