KP321X
High Performance Low Cost Off-line PWM Power Switch
FEATURES GENERAL DESCRIPTION
Integrated with 650V Power MOSFET and KP321X family is a high performance Switch Mode
HV Startup Circuit Power Supply Switcher for low power off-line
application with minimum components in typical
Multi Mode Control with Audio Noise Free
buck solution. This family has built-in high break
Operation
down voltage MOSFET to withstand high surge
Supports Buck and Buck-Boost
input.
Topologies
Default 12V Output with FB floated Unlike conventional PWM control, there’s no fixed
Less than 50mW Standby Power internal clock in KP321X family to trigger the
Green Mode Operation for High Efficiency GATE driver, the switching frequency is changed
according to the load condition. The multi mode
Good Line and Load Regulation
PWM control is integrated to simplify circuit design
Built-in Soft Start
and achieve good line and load regulation without
Build in Protections: audio noise generated. The peak current limit
Over Load Protection (OLP) changes according to the real load condition for
Cycle-by-Cycle Current Limiting (OCP) low standby power in no load.
Output OVP
KP321X integrates functions and protections of
VDD OVP, UVLO & Clamp
Under Voltage Lockout (UVLO), Cycle-by-cycle
Available with SOP-8 and DIP-8 Package
Current Limiting (OCP), Output OVP, On-chip
Thermal Shutdown, Over Load Protection (OLP),
APPLICATIONS VDD OVP with Auto Recovery Mode Protection,
etc.
Small Home Appliance
Industry Controls
TYPICAL APPLICATION CIRCUIT
KP321X
5 Drai n VDD 1
6 Drai n FB 3
RFB 1 Cvdd
7 Drai n CS 4
Rcs
Drai n GND 2 RFB 2
L
8
HV DC
Input
Vout<10V
September 29, 2018
DS_KP321X_REV1.5_EN
www.kiwiinst.com
©Kiwi Instruments Corp. Confidential 1
