Multi-Mode PWM Flyback Controller with Integrated BNI/BNO (Brown-In / Brown-Out) and Protection
In order to enhance the efficiency performance, the LD5523L 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, especially at boundry mode in heavy load. While the frequency swapping function of LD5532L can reduce the EMI emission of SMPS and helps the power circuit designers to simply deal with EMI filter and saves several component and developing time.
The IC includes the comprehensive protection function, such as Over Load Protection (OLP), Over Voltage Protection (OVP), Output Short Circuit Protection (OSCP) and adjustable Over Temperature Protection (OTP). Furthermore, the programmable brown-in/out protection is built-in.
The IC is available in SMD and THT. LD5523L GL in SOT-26 and LD5523L GN in DIP-8 package.
FEATURES
▲ Secondary side feedback control with quasi-resonant + CCM operation
▲ Low startup current (< 1mA)
▲ 0.285mA ultra-low operating current at light load
▲ Current mode control with cycle-by-cycle current limit
▲ Green mode control
▲ UVLO (under voltage lock out)
▲ LEB (leading-edge blanking) on CS pin
▲ VCC OVP (over voltage protection)
▲ Adj. OVP (over voltage protection) on FB pin
▲ Adj. UVP (under voltage protection) on FB pin
▲ Adjustable brown-in/out 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)
▲ 380mA/-450mA Gate source/sink capability at output pin with 33nF capacitor
APPLICATIONS
▲ Switching AC/DC adaptor
Datasheet 
