High Voltage Two Level Frequency Green Mode PWM Controller
The LD5761B is a Green Mode PWM IC built-in with brown-in/out (BNI/BNO) in a small package. The device could therefore minimize the component counts, circuit space,
and reduces the overall material cost of power applications.
The two level frequency of operation enables excellent performance and high efficiency at nominal line. While in low line, just operate in high level frequency to reduce BMAX.
Without changing transformer design, the energy loss is perfectly minimized.
With complete protection, like OLP (Over Load Protection), OVP (Over Voltage Protection), fast SCP (Short Circuit Protection) and brown-in/out protection,
LD5761B prevents the circuit from being damaged under abnormal conditions.
Furthermore, the LD5761B features frequency swapping and soft driving function to minimize the noise and improve EMI.
The IC is available in SMD. LD5761B GR in SOP-7 and LD5761B GS in SOP-8 package.
FEATURES
▲ High voltage (650V) startup circuit
▲ Two level frequency operation at H/L line
▲ Built-in brown-in/out function on HV pin
▲ Built-in RFI X-capacitor discharge on HV pin
▲ Frequency swapping for EMI improve
▲ Non audible noise green mode control
▲ LEB (lead edge blanking) on CS pin
▲ No-load power consumption < 30mW at 230VAC wit X-capacitor discharge
▲ Internal slope compensation
▲ OVP (over voltage protection) on VCC
▲ OLP (over load protection)
▲ OTP (over temperature protection)
▲ OSCP (output short circuit protection)
▲ Soft driving
▲ 300mA/-800mA driving capability
APPLICATIONS
▲ Open frame switching power supply
▲ LCD monitor / TV power system
▲ Switching AC/DC adaptor and battery charger
Datasheet 
