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AP3710 Datasheet(PDF) 1 Page - BCD Semiconductor Manufacturing Limited |
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AP3710 Datasheet(HTML) 1 Page - BCD Semiconductor Manufacturing Limited |
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1 / 16 page  LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER AP3710 Preliminary Datasheet 1 BCD Semiconductor Manufacturing Limited Nov. 2007 Rev. 1. 2 General Description The AP3710 is a green-mode PWM controller, its main applications are low power supplies such as offline battery chargers, adapters, STB and other auxiliary supplies, where the needs for low no load power, low total cost and high reliability are all required. The functional blocks of AP3710 include: under volt- age lockout with low start-up current; precise voltage reference for internal comparators; PWM comparator with current limit control, feedback signal and band- gap input; short circuit comparator and open circuit protection for opto-coupler. The AP3710 operates at a fixed 60kHz switching fre- quency, its output connects to the emitter of high volt- age NPN transistor or the source of MOSFET. In normal mode, it works as a switch to turn on or turn off the external transistor. In failure modes like open loop, over voltage or overload due to short circuit, the chip enters into an auto restart mode controlled by the inter- nal protection unit. The AP3710 is available in SOIC-8 and DIP-8 pack- ages. Features · Current Mode Control with Skip Cycle Capability · Low Start-up Current: 0.25 mA · Low Operating Current: 0.45mA · Output Current Capacity: 900 mA · Fixed Switching Frequency: 60 kHz · Frequency Dithering for Low EMI · Under-Voltage Lockout with Hysteresis · Built-in Slope Compensation · Short Circuit Protection · Open and Short Circuit Protection for Opto- Coupler · Maximum Input Power is 0.2W under No Load · Maximum Input Power is 1W under 0.5W Load · Low Total Cost Solution Applications · Adapters · Battery Chargers · Set Top Boxes · Auxiliary Supplies · DVD Figure 1. Package Types of AP3710 SOIC-8 DIP-8 |
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