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NCP631GD2T Datasheet(PDF) 6 Page - ON Semiconductor |
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NCP631GD2T Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 9 page NCP631 http://onsemi.com 6 APPLICATIONS INFORMATION Input Capacitor The minimum capacitance required for stability is a 68 mF aluminum electrolytic or tantalum capacitor. The maximum ESR allowed for stability is 5.0 W. The capacitor should be place as close as possible to the input of the device. The placement of a ceramic capacitor in parallel is not recommend due to possible instabilities. Output Capacitor A minimum output capacitor value of 33 mF is required for stability. The type of capacitor can be aluminum electrolytic or tantalum capacitor. ESR can vary up to a maximum of 2.0 W for stability. The capacitor should be placed as close as possible to the output of the device. The placement of a ceramic capacitor in parallel is not recommend due to possible instabilities. Soft−Start Function Slope of the output voltage during startup (Shutdown pin goes from low to high) can be adjusted by value of Cs capacitor. The basic formula for this function is: dV dt + Iss Cs + Iout Cout * Vref Vout (eq. 1) Where: Iss + 11 mA (eq. 2) Vref + 1.2 V Vout + 3.47 V Cs + 10 nF (typ) Output current limitation during start−up: Iout + Vout Vref *Cout * Iss Cs (eq. 3) An example for Cout = 500 mF, Cs = 10 nF: Iout + 3.47 1.2 * 500E * 6* 11E * 6 10E * 9 + 1.59 A (eq. 4) Time when the output voltage will reach target value can be determined by: Ts + Vref * Cs Iss (eq. 5) An example for Cs = 10 nF: Ts + 1.2 * 10E * 9 11E * 6 + 1.09 ms (eq. 6) Figure 13. Typical Soft−Start Condition 2 0 4 2 0 2 1 0 2 1 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 TIME (mS) Vin = 5.5 V, Rout = 6.0 W, Cs = 10 nF Cout = 385 mF + 33 mF + 22 mF 3 |
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