IC For Power Switch

LYW1920B

Features: 

Integrated with 650V MOSFET

Multimode PSR Control

Audio Noise Free Operation for PSR

Optimized Dynamic Response for PSR

Low Standby Power <70mW

±4% CC and CV Regulation

Programmable Cable Drop Compensation (CDC) in PSR CV Mode

Built-in AC Line & Load CC Compensation 

The LYW1920B is a family of a high performance Primary Side Regulation (PSR) power switch with high precision CV/CC control ideal for charger applications.     

In CV mode, The LYW1920B adopts Multi Mode Control which uses the hybrid of AM (Amplitude Modulation) mode and (Frequency Modulation) FM mode to improve system efficiency and reliability.     

In CC mode, the IC uses PFM control with line and load CC compensation. The IC can achieve audio noise free operation and optimized dynamic response. The built-in Cable Drop Compensation (CDC) function can provide excellent CV performance.     

The LYW1920B integrates functions and protections of Under Voltage Lockout (UVLO), VDD over Voltage Protection (VDD OVP), Cycle-by-cycle Current Limiting (OCP), Short Load Protection (SLP), and VDD Clamping.     

The LYW1920B is available in SOP-7 package. 

LYW1921

Features: 

Integrated with 1000V MOSFET 

Support Flyback and Buck Topology

Flyback PSR Control (SEL= Floating) 

QR-Buck Control (SEL= GND) 

Multimode PSR Control 

Audio Noise Free Operation for PSR 

Optimized Dynamic Response for PSR 

Low Standby Power <70Mw 

±4% CC and CV Regulation 

Built-in AC Line & Load CC Compensation 

LYW1921 is a family of a high performance Primary Side Regulation (PSR) power switch with high precision CV/CC control ideal for charger applications. The IC can also support Quasi-Resonant (QR) Buck CC&CV topology for LED lighting if SEL pin is short to GND.

In CV mode, LYW1921 adopts Multi Mode Control which uses the hybrid of AM (Amplitude Modulation) mode and (Frequency Modulation) FM mode to improve system efficiency and reliability. In CC mode, the IC uses PFM control with line and load CC compensation. The IC can achieve audio noise free operation and optimized dynamic response. The built-in Cable Drop Compensation (CDC) function can provide excellent CV performance.

LYW1921 integrates functions and protections of Under Voltage Lockout (UVLO), VDD over Voltage Protection (VDD OVP), Cycle-by-cycle Current Limiting (OCP), Short Load Protection (SLP), and VDD Clamping.