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NCP1596MNTWG Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP1596MNTWG Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 12 page NCP1596, NCP1596A http://onsemi.com 11 APPLICATION INFORMATION Output Voltage Selection The output voltage is programmed through an external resistor divider connect from VOUT to FB then to GND. For internal compensation and noise immunity, the resistor from FB to GND should be in 10 k to 20 k ranges. The relationship between the output voltage and feedback resistor is given by: VOUT + VFB 1 ) R1 R2 (eq. 1) VOUT: Output voltage VFB: Feedback Voltage R1: Feedback resistor from VOUT to FB. R2: Feedback resistor from FB to GND. Input Capacitor Selection In the PWM buck converter, the input current is pulsating current with switching noise. Therefore, a bypass input capacitor must choose for reduce the peak current drawn from the power supply. For NCP1596, low ESR ceramic capacitor of 10 mF should be used for most of cases. Also, the input capacitor should be placed as close as possible to the VCCA pin for effective bypass the supply noise. Inductor Selection The inductor parameters are including three items, which are DC resistance, inductor value and saturation current. Inductor DC resistance will effect the convector overall efficiency, low DC resistor value can provide a higher efficiency. Thus, inductor value are depend on the inductor ripple current, input voltage, output voltage, output current and operation frequency, the inductor value is given by: DIL + VOUT L FSW 1 * VOUT VIN (eq. 2) DIL : peak to peak inductor ripple current L: inductor value FSW: switching frequency After selected a suitable value of the inductor, it should be check out the inductor saturation current. The saturation current of the inductor should be higher than the maximum load plus the ripple current. DIL(MAX) + DIOUT(MAX) ) DIL 2 (eq. 3) DIL(MAX) : Maximum inductor current DIOUT(MAX) : Maximum output current Output Capacitor Selection Output capacitor value is based on the target output ripple voltage. For NCP1596, the output capacitor is required a ceramic capacitors with low ESR value. Assume buck converter duty cycle is 50%. The output ripple voltage in PWM mode is given by: DVOUT [ DIL 1 4 FSW COUT ) ESR (eq. 4) In general, value of ceramic capacitor using 20 mF should be a good choice. ORDERING INFORMATION Device Package Shipping† NCP1596MNTWG DFN−6 (Pb−Free) 3000 / Tape & Reel NCP1596AMNTWG DFN−6 (Pb−Free) 3000 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. |
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