Summary:
CX7520 is a secondary power control chip with built-in high-voltage Super Junction N-Channel MOSFET and current control mode, applied to SSR power solutions with power within 25W.
CX7520 operates in PWM mode at a fixed switching frequency, which is precisely set internally. When unloaded or lightly loaded, the operating frequency is adjusted internally by the IC. The chip can work in green mode to reduce losses during light loads and improve the overall work efficiency. During startup and operation, only a small current is required, and a large resistor can be used in the startup circuit to further reduce power consumption during standby.
CX7520 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. The built-in leading edge blanking time eliminates the impact of diode reverse recovery current in the buffer network on the circuit.
CX7520 adopts jitter technology, which can effectively improve the EMI performance of the system. The frequency hopping of the system is set above audio (22KHz), which can avoid system noise during operation. Built-in multiple protections, including cycle by cycle current limiting protection (OCP), overvoltage protection (VDD 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
Dithering function to improve EMI performance
Frequency hopping mode improves light load efficiency and reduces standby power consumption
Fixed 65KHz switching frequency
Built-in synchronous slope compensation
Low starting 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)
Packaging SOP-8L
Application:
Charger
Suitable for PDA, digital camera, and camera power adapters
Set-top box power supply
Open Frame Switching Power Supply
Personal computer auxiliary power supply