KP311ALGA

High performance, low cost off-line PWM power switch

The KP311ALGA is a non-isolated, highly integrated, and low-cost PWM power switch for step-down and step-down circuits.

The KP311ALGA uses a high voltage single wafer process, integrating a 500V high voltage MOSFETs and a controller with switching peak current mode control on the same wafer. High precision 5V default output is guaranteed in the full voltage input range. In the chip, the minimum Toff time of the chip is fixed at 32μs with 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.

KP311ALGA 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

• Support ultra-low voltage input (more than 12V) applications

• Support buck and lift circuit

• Switching peak current mode control

• Ultra-low standby power consumption less than 50mW

• Ultra-low operating current, support small VDD capacitance

• Integrated soft start circuit

• Integrated protection features:

• Overload Protection (OLP)

• Overheat protection (OTP)

• Cycle Current Limit (OCP)

• Abnormal Overcurrent Protection (AOCP)

• Front blanking (LEB)

• VDD undervoltage protection

• Package SOT23-3

Typical application

• Power supply for small household appliances

• Auxiliary power supply