CW1131

High performance, low cost off-line PWM control switch

The CW1131 is a non-isolated, highly integrated and low-cost PWM power switch for buck and lift circuits. The CW1131 uses a high voltage single wafer process that integrates a 500V high voltage MOSFETs and a controller controlled by switching peak current mode on the same wafer. High precision 5V default output is guaranteed in the full voltage input range.

Inside the chip, the minimum Toff time of the chip is fixed at 32us and there is a buffeting function, which optimizes the EMI effect under the condition of ensuring the output power. At the same time, the chip is designed with heavy and heavy load mode, which can easily obtain standby power consumption of less than 50mW. CW1131 integrates complete protection functions: VDD undervoltage protection, cycle by cycle current limit, abnormal overcurrent protection, overheat protection, overload protection and short circuit protection.

Main feature

• High precision 5V default output

• Integrated 500V high voltage MOSFET and high voltage start circuit

• Integrated sampling resistance, low system cost

• Supports ultra-low voltage input (more than 15V) applications

• supports step-down and step-down circuits

• switching peak current mode control

• Ultra-low standby power consumption less than 50mW

• Ultra-low working current, support small VDD capacitor

• Integrated soft start circuit

• Integrated protection features:

• Overload Protection (OLP)

• Overheat Protection (OTP)

• Cycle by Cycle Current Limit (OCP)

• Abnormal Overcurrent Protection (AOCP)

• Front blanking (LEB)

• VDD Undervoltage protection

• Package SOT23-3L