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BD94121F Datasheet(PDF) 10 Page - Rohm |
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BD94121F Datasheet(HTML) 10 Page - Rohm |
10 / 28 page 10/24 TSZ02201-0F5F0C100100-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 22.Feb.2016 Rev.001 www.rohm.com TSZ22111 • 15 • 001 BD9412F Pin Function Description PIN.1 VCC This is power supply pin for the IC. Normal operation range (Typ) is from 9V to 18V. Please place ceramic capacitor bigger than 0.1µF as bypass capacitor between VCC and GND. It is for noise elimination. PIN.2 STB This PIN is for setting of ON/OFF. It is possible to use as reset when shutting down. Please set the STB terminal voltage below VCC voltage. In addition, please set below 4V if the voltage is applied earlier than VCC. Depending on input voltage to STB pin, the status of IC might be switched (ON/OFF). Please avoid using between the two status (0.8V to 2.0V) PIN.3 GND This is signal system GND for IC inside. Please make it independent from PGND as much as possible (We recommend this because it has less influence with switching noise which comes from short circuit of PGND and GND at connector close to GND pin. N1 N2 Vin GND GND_PIN PGND PIN.4 RT Set up the charge/discharge current by frequency of IC inside. By changing the resistance value of resistor between RT pin and GND, it is possible to set up basic drive frequency as following formula; Basic frequency means output N1, N2 frequency which is determined only with resistor between RT pin and GND. ) 200 ( ] [ 336 . 3 ] [ 6673 ) 200 ( ] [ ] [ 6000 kHz f kHz k R f kHz f kHz k R f OUT RT OUT OUT RT OUT There is a discrepancy between theoretical formula and actual device. For frequency setting, please thoroughly verify it with actual application. In addition, frequency may change upon resistor RADJ which is placed between RT and FB pins Figure. 11 Figure. 12 RT Resistance vs Output Frequency 1 10 100 1,000 10 100 1,000 RT Resistance : RRT [kΩ] OSC RRT RT BD94121F FB CFBIS IS VS Error Amp CFBVS RFBIS RFBVS Figure. 13 RRT Resistor connection method |
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