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AP3720 Datasheet(PDF) 1 Page - BCD Semiconductor Manufacturing Limited |
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AP3720 Datasheet(HTML) 1 Page - BCD Semiconductor Manufacturing Limited |
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1 / 13 page  Preliminary Datasheet CURRENT MODE PWM CONTROLLER FOR BJT AP3720 Jul. 2009 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 1 General Description The AP3720 is a low startup current, current mode PWM controller with green-mode operation. The PWM switching frequency at normal operation is 65k, but when the output power drops below the specifically level, the device enters the frequency-drop mode and the typical operating frequency is 20kHz (no audible noise). Additionally, when the load drops to a very low level or zero, the IC operates in so called ‘burst mode’ to minimize switching loss. The IC integrated a lot of functions such as the Lead-Edge Blanking (LEB) of the current sensing, internal slope compensation, line compensation, and several protection features. The protection functions include cycle-by-cycle current limit (OCP), VCC over voltage protection (OVP), OTP and OLP. The AP3720 is available in DIP-8 and SOIC-8 packages. Features • Low Startup Current （ 2.5 µA ） and Low Operating Current (1.2mA) • Off-line Converter Applied in Sub 25W Range • Skip Cycle Mode Achieves Low Standby Power (<200mW) • Cycle-by-Cycle Power Limited • Frequency-drop Mode • Soft Start with 2ms • Programmable Drive Current for BJT • Leading Edge Blanking • Pre-shutdown Decreases Turn-off Losses • Reliable Protection: Accurate OCP with Line Compensation Short Circuit Protection Over Voltage Protection for VCC Hysteretic Thermal Shutdown Protection Applications • STB • Cable Modem • ADSL Modem • DVD Recorder Figure 1. Package Types of AP3720 DIP-8 SOIC-8 |
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