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L2800 Datasheet(PDF) 5 Page - E-Tech Electronics LTD |
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L2800 Datasheet(HTML) 5 Page - E-Tech Electronics LTD |
5 / 7 page L2800 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 5 of 7 www.unisonic.com.tw QW-R103-030.C DIAGRAM HOW TO SET THE TIME CONSTANT FOR SHORT CIRCUIT DETECTION AND SOFT START 1. SHORT CIRCUIT PROTECTION Te error amplifier output (FB pin) is fixed at VOM + and capacitor CPE starts charging i the switching regulator output suddenly drops due to load effect. The output pin is set low and the SCP pin stays low when the voltage at the SCP pin reaches approximately 0.8V. As the protection circuit operates, by resetting the power supply the circuit will be restored. •Short circuit detection time tPE ≒ [S] 0.8×CPE[μF] 2. SOFT START Once power on, the capacitor CPE which is connected to the SCP pin starts charging.The soft start setting voltage is compared by the PWM comparator as the voltage’s proportion at the SCP pin with the sawtooth waveform. The comparison controls the OUT pin’s ON duty,which is causing the soft start operation. During the time for completion of soft start operation, the SCP pin’s voltage stays low, but the soft start setting voltage stays high, and the circuit then enters the output short circuit detection wait state. Soft start time (until the output ON duty reaches approximately 50%) ≒ ts[S] 0.35×CPE[μF] |
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