LW4933

LW4933 POWER SUPPLY SUPERVISOR WITH PWM CONTROLLER Description The LW4933 is designed with a pulse-width-modulation control circuit and a complete power supervisor for use in the switched mode power supply . It contains various functions, like under voltage protection (UVP), over voltage protection (OVP), power good output (PG) and ON/OFF control (REM). UVP(Under voltage protection) function is for +3.3V, +5V, +12V outputs. OVP(Over voltage protection) function is for +3.3V, +5V, +12V and PT is for extra protection input. PG(Power good signal) is a safe operation signal to inform the external parts. REM(Remote on/off) is used to control the SMPS on/off. The REM control signal has the on/off transferred debounce–time. PIN CONFIGURATION (Top View) FEATURE ■ 3-channel under voltage protection (UVP) ■ 3-channel over voltage protection (OVP) ■ 1-channel extra protection (PT) ■ 1-channel sense input to control the PG (SEN) ■ Remote on/off control function (REM) ■ Dual output for push-pull operation (OP1/OP2) ■ Soft start capability by external capacitor (SS) ■ VCC under voltage lockout ■ 16-Pin dual in-line package ■ Pb-free Package are available ORDERING INFORMATION ORDER NUMBER LW4933 Package DIP-16 (Pb-free) Shipping Tube Top Marking LW4933 REFERENCE APPLICATION CIRCUIT datasheet Rev.A1.0 1 LW4933D/ LW4933S POWER SUPPLY SUPERVISOR WITH PWM CONTROLLER PIN DESCRIPTION Pin Symbol 1 V33 2 V5 3 V12 4 PT 5 GND 6 RT 7 OP1 8 OP2 9 REM 10 SS 11 PG 12 SEN 13 VCC 14 COMP 15 NEG ...