전자부품 데이터시트 검색엔진 |
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BD3507HFV 데이터시트(PDF) 8 Page - Rohm |
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BD3507HFV 데이터시트(HTML) 8 Page - Rohm |
8 / 16 page Technical Note 8/15 BD3507HFV www.rohm.com 2010.05 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. ● Application setting method Part No Value Notes for Use R1/R2 22k/11k The present IC can set output voltage by external reference voltage (VR) and value of output voltage setting resistors (R1, R2). Output voltage can be set by VRxR2/(R1+R2) but it is recommended to use at the resistance value (total: about 10 kΩ) which is not susceptible to VREF bias current (±100nA). C3 22μF Connect the output capacitor between Vo terminal and GND terminal without fail in order to stabilize output voltage. The output capacitor has a role to compensate for the phase of loop gain and to reduce output voltage fluctuation when load is rapidly changed. When there is an insufficient capacity value, there is a possibility to cause oscillation, and when the equivalent serial resistance (ESR) of the capacitors is large, output voltage fluctuation is increased when load is rapidly changed. About 22µF ceramic capacitors are recommended but output capacitor greatly depends on temperature and load conditions. In addition, when various capacitors are connected in series, the total phase allowance of loop gain becomes not sufficient, and oscillation may result. Thoroughgoing confirmation at application temperature and under load range conditions is requested. C1 0.1μF The input capacitor plays a part to lower output impedance of a power supply connected to input terminals (Vcc). When output impedance of this power supply increases, the input voltages (Vcc, VIN) become unstable and there is a possibility of giving rise to oscillation and degraded ripple rejection characteristics. The use of capacitors of about 10μF with low ESR, which provide less capacity value changes caused by temperature changes, is recommended, but since input capacitor greatly depends on characteristics of the power supply used for input, substrate wiring pattern, thoroughgoing confirmation under the application temperature and load range, is requested. C2 10μF The input capacitor plays a part to lower output impedance of a power supply connected to input terminals (VIN). When output impedance of this power supply increases, the input voltages (Vcc, VIN) become unstable and there is a possibility of giving rise to oscillation and degraded ripple rejection characteristics. The use of capacitors of about 10μF with low ESR, which provide less capacity value changes caused by temperature changes, is recommended, but since input capacitor greatly depends on characteristics of the power supply used for input, substrate wiring pattern, thoroughgoing confirmation under the application temperature and load range, is requested. C4 1μF The present IC can set the output voltage buildup time by VREF terminal capacitor (C4) and R1 and R2 values. When EN terminal is “High” or UVLO is reset, output voltage is built up by the time constant determined by C4, R1, and R2. It is recommended to use capacitors (B special) with little capacity value change caused by temperature change for C4. Vcc VIN VREF Vo EN GND VIN ON/OFF Ceramic Capacitor VO Vcc VREF R1 C1 C2 C3 C4 R2 VR |
유사한 부품 번호 - BD3507HFV_10 |
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유사한 설명 - BD3507HFV_10 |
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