F72820中文资料Switching数据手册FINTEK规格书

描述 Description

The F72820 is a single PWM DC-DC converter controller for application requiring high current such as motherboard, graphic card etc. The F72820 uses voltage mode PWM controller with fast transient response (driving two external N-channel MOSFETs in a synchronous rectified buck converter topology) and integrates some functions such as soft-start, over current and short circuit protections etc. Over current protection is achieved by monitoring the voltage drops across the high side MOSFET without the need for a current sensing resistor and short circuit condition is detected through FB pin. If fault conditions occur, the F72820 will initiate the soft start cycle. After three cycles and the fault conditions persist, the controller will go into shut down status. In shut down status, both gate drive signals will be low. To restart the controller, either recycling the Vcc supply or momentarily pulling OCSET pin below 1.25V. The F72820 is available in 8-SOP package. (1)(1)

特性 Features

Provides one synchronous rectified buck DC-DC PWM controller
-  Fast transient response (high bandwidth error amplifier; full 0~100% duty cycle)
-  Fixed operation frequency : 300KHz
-  Single loop voltage-mode control
-  Few external components
-  Output range adjustable down to 0.8V
Operation is under 5V input
Drives external N-channel MOSFETs
Over current monitor is usedby MOSFET RDS(ON)
0.8V internal reference voltage
  -  ±2% accuracy over line, load and temperature
Internal soft-start (typically 3 ms)
Internal loop compensation
Under voltage fault monitoring and protection
Over voltage protection
8-SOP package (150 mil)
8-SOP Green Package