3732
product description
3732 is a low-cost constant current and constant voltage primary feedback controller. The system does not require power supply windings and power supply diodes, which greatly reduces production costs. Suitable for various low-power AC/DC charger and adapter applications.
In the constant current control mode, the output current can be adjusted by changing the resistance of the Rcs resistor connected to the CS pin. In the constant voltage control mode, the 3732 uses a variety of working modes to obtain high conversion efficiency and small audio abnormal noise. The 3732 has built-in output line loss compensation, and the compensation ratio can be adjusted by modifying the feedback resistance value to meet the requirements of various output wire loss and can effectively compensate the output current
The line loss and voltage drop caused on the output line. 3732 works in PFM under constant current mode and heavy load, while reducing Ipeak and working frequency at light load and medium load at the same time to optimize conversion efficiency and avoid abnormal audio noise.
3732 has multiple protection functions, including output open circuit, short circuit protection, over temperature protection, etc.
3732 adopts SOP-7 package.
main feature
• Integrated high voltage start device
• No need for power supply winding and power supply diode built-in power transistor
• High precision of constant voltage and constant current
• Adjustable output line loss compensation
• Built-in input line voltage compensation
• Output open circuit, short circuit protection
• Over temperature protection
Scope of application
• Adapter and charger LED drive power for mobile phones, cordless phones, PDAs, MP3s and other portable devices
• Linear voltage and RCC switching power supply upgrades
• Auxiliary power supply for PC, TV and other equipment
Related documents
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