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AP3101P-E1 Datasheet(PDF) 10 Page - BCD Semiconductor Manufacturing Limited |
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AP3101P-E1 Datasheet(HTML) 10 Page - BCD Semiconductor Manufacturing Limited |
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10 / 14 page  GREEN MODE PWM CONTROLLER AP3101 Preliminary Datasheet 10 Apr. 2007 Rev. 1. 3 BCD Semiconductor Manufacturing Limited Operation Description (Continued) in series with the source of the MOSFET. The peak inductor current under normal operating conditions is controlled by the voltage at FB pin: Abnormal operating conditions occur when the power supply output is overloaded or the output voltage sens- ing is lost. Under these conditions, the current sense comparator threshold will be internally clamped to 0.85V. Therefore the maximum peak switch current is: Leading Edge Blanking A narrow spike on the leading edge of the current waveform can usually be observed when the power MOSFET is turned on. A 270 ns leading-edge blank is built-in to prevent the false-triggering caused by the turn-on spike; so the RC filter on the current sense input can be removed. During this period, the current limit comparator is disabled and the gate driver can not be switched off. Built-in Slope Compensation It is well known that a continuous current mode SMPS may become unstable when the duty cycle exceeds 50%. The built-in slope compensation can improve the stability, so there is no need for design engineer to spend much time on that. Short Circuit Protection Built-in short circuit protection can protect a SMPS from being damaged when short circuit of output or over load conditions happen. The feedback voltage will keep its value above its upper limit of 4.2V as long as short circuit exists, and then gate driver will be turned off after fixed delay time of 23 ms. When VCC of AP3101 dropped under the minimum operating voltage, the device will be turned off and the system will try to restart. The SMPS will not recover its normal operation until the short circuit or over load is removed. Green Mode Operation ADJ pin is the non-inverting input of skip cycle comparator. The voltage at FB pin minus 0.9V is compared with the voltage at ADJ pin. If the voltage at ADJ pin is larger, AP3101 will start to blank its output pulse. In normal operation, AP3101 works at fixed switching frequency, and VFB is in high level. When load power becomes lighter, the VFB will decrease. When VFB drops to the threshold, AP3101 will enter the skip cycle mode and operate intermittently. The threshold is adjustable by changing the value of the resistor connected from pin ADJ to the ground. S FB pk R V I 3 / ) 9 . 0 ( − = S PK R I / 85 . 0 (max) = |
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Similar Description - AP3101P-E1 |
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