LD5523K - Leadtrend

LD5523K Multi-Mode PWM Controller of Flyback

In order to enhance the efficiency performance, the LD5523K integrates the multi-mode PWM controller, which consists of Quasi-Resonant (QR) PWM control for light load condition and Continue Conduction Mode (CCM) for heavy load condition. Moreover, the QR controller not only gains the system performance, but also brings the worse EMI capability, while the fre.

Features

 Secondary-side feedback control with quasi-resonant + CCM operation
 Low Startup Current (<1A)
 0.285mA Ultra-low operating current at light load
 Current Mode Control with Cycle-by-Cycle Current Limit
 Green Mode Control
 UVLO (Under Voltage Lockout)
 LEB (Leading-Edge Blanking) on CS Pin
 VCC OVP (Over Voltage Protection)
 Adj. OVP / UVP on FB pin
 Adj. BNI/BNO, Bulk cap. OVP on FB pin
 OLP (Over Load Protection)
 External OTP (Over Temperature Protection) on CS Pin
 Internal OTP (Over Temperature Protection)
 SDSP (Secondary Diode Short Protection)
 Gate Source/Sink Capabil.