Summary:

CX7536B is a current mode PWM control chip with built-in high-voltage power MOSFET, suitable for solutions with power below 40W.

CX7536B operates in PWM mode at a fixed switching frequency, which is precisely set internally; During no-load or light load, the working frequency is adjusted internally by the chip. The chip can operate in green mode to reduce losses during light load and improve the overall work efficiency. Only a small current is required during startup and operation, and a large resistor can be used in the startup circuit to further reduce power consumption during standby.

CX7536B chip is equipped with a slope compensation circuit, which avoids the occurrence of subharmonic oscillation and improves system stability when the circuit operates at a high duty cycle. It also has a leading edge blanking time, which eliminates the impact of diode reverse recovery current in the buffer network on the circuit. The use of frequency jitter technology can effectively improve the EMI performance of the system. The frequency hopping frequency of the system is set above audio (22KHz), which can avoid system noise during operation.

CX7536B is equipped with various built-in protections, including cycle by cycle current limiting protection (OCP), VDD overvoltage protection (OVP), VDD overvoltage clamping, undervoltage protection (UVLO), over temperature protection (OTP), etc. The EMI characteristics of the system can be better improved through the internal soft drive structure.

Characteristic:

• Standby power consumption less than 75mW at full voltage range (90Vac-265Vac) input

• Built in soft start to reduce stress on Vds on MOSFETs

• Frequency jitter function to improve EMI performance

• Frequency hopping mode improves light load efficiency and reduces standby power consumption

• Fixed 85KHz switching frequency

• Built in synchronous slope compensation

• Low starting current, low working current

• Built in Leading Edge Blanking (LEB) function

• Built in overload protection (OLP)

• Cycle by cycle current limiting protection (OCP)

• VDD overvoltage protection, undervoltage protection (UVLO), VDD voltage clamping

• Secondary output diode short circuit protection

• Over temperature protection (OTP)

• Encapsulation of ESOP-6

Application:

• Charger

• Suitable for PDA, digital camera, camera power adapter

• Set-top box power supply

• Open frame switching power supply

• Personal computer auxiliary power supply