CR6842S

CR6842 – Green-Power PWM Controller with Frequency Jittering

Features:

• Low-cost, green-power burst-mode PWM

• Very low start-up current (≈7.5µA)

• Low operating current (≈3.0mA)

• Current-mode operation

• Under-voltage lockout (UVLO)

• VDD over-voltage protection (OVP)

• Programmable over-temperature protection (OTP)

• Internal latch for OTP and OVP

• Built-in 1ms soft-start

• Built-in frequency jittering for EMI improvement

• Soft-clamped gate output voltage of 16.5V

• VDD OVP trigger level at 25.5V

• Cycle-by-cycle current limiting

• Fault detection via sense input

• Output short-circuit protection (SCP)

• Built-in synchronized slope compensation

• Leading-edge blanking at current sense input

• Programmable PWM frequency

• High-voltage CMOS process with ESD protection

• DIP-8 & SOP-8 Pb-free packages

• Compatible with SG6842J, LD7552, OB2269

Applications:

• Power adapters

• Battery charger adapters

• Open-frame switching power supplies

• LCD monitors

General Description:
The CR6842 is a low-startup-current, low-cost current-mode PWM controller designed for green power applications. It features burst-mode operation for light and no-load conditions to minimize power consumption. Integrated functions such as slope compensation, soft start, and current-sense blanking help reduce external component count. The controller shuts down PWM output under fault conditions such as overvoltage, overtemperature, or short circuit. OTP is supported via an external NTC resistor. An internal latch disables output when VDD exceeds the threshold; the latch resets after VDD is removed.

Tags: cr6842s, pwm controller, power supply, adapter, charger, led driver, IC, protection, SMPS