PSR Constant Current LED Power Switch

General Description

KP1031B is a highly integrated power switch with Primary Side Regulation (PSR) constant current (CC) control for LED lighting applications.

KP1031B combines a 650V power MOSFET switch with a power controller in one chip. The IC also integrates high voltage startup/IC supply circuit and a novel transformer demagnetization circuit, which eliminates transformer auxiliary winding. In CC mode, the IC uses PFM control with line CC compensation.

KP1031B integrates functions and protections of Under Voltage Lockout (UVLO), Cycle-by-cycle Current Limiting (OCP), Thermal Fold-back (OTP), LED Open/Short Protection, etc.


l   Integrated with 650V MOSFET

l   No Auxiliary Winding Needed

l   ±4% CC Regulation

l   Very Low VDD Operation Current

l   Built-in Thermal Fold-back

l   Built-in Charging Circuit for Fast Start-Up

l   Built-in AC Line CC Compensation

l   Build in Protections:

n  LED Open/Short Protection

n  On-Chip Thermal Fold-back (OTP)

n  Cycle-by-Cycle Current Limiting

n  Leading Edge Blanking (LEB)

n  Pin Floating Protection


l   Available with SOP-8 Package


l   Bulb

l   Spot Light


Pin Configuration

Typical Application Circuit

Ordering Information

Part Number         Description
KP1031BSPASOP-8, Pb free in T&R, 4000Pcs/Reel