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BDXXKA5WF Datasheet(PDF) 6 Page - Rohm |
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BDXXKA5WF Datasheet(HTML) 6 Page - Rohm |
6 / 10 page BD□□KA5,BD□□KA5W Series,BD00KA5W Series Technical Note 6/9 www.rohm.com 2009.04 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. 1μF ● Terminal Vicinity Settings and Cautions ・ Vcc Terminal Please attach a capacitor (greater than 1μF) between Vcc and GND. The capacitance values differ depending on the application, so chose a capacitor with sufficient margin and verify the operation on actual board. ・ GND Terminal Please be sure to keep the set ground and IC ground at the same potential level so that a potential difference does not arise between them. If a potential difference arises between the set ground and the IC ground, the preset voltage will not be output properly, causing the system to become unstable. Please reduce the impedance by making the ground patterns as wide as possible and reducing the distance between the set ground and the IC ground as much as possible. ・ CTL Terminal The CTL terminal is turned ON at 2.0V and higher, and OFF at 0.8V and lower, within the operating power supply voltage range.The power supply and the CTL terminal may be started up and shut down in any order without problems. ● Vo Terminal Please be sure to attach an anti-oscillation capacitor between Vo and GND. Be sure to place an anti-oscillation capacitor between the output terminal and the GND. Oscillations may arise if the capacitance value changes, due to factors such as temperature changes. A 1μF capacitor with small internal series resistance (ESR) such as a ceramic capacitor is recommended as an anti-oscillation capacitor. Ceramic capacitors generally have favorable temperature characteristics and DC bypass characteristics. When selecting a ceramic capacitor, a high voltage capacitor (good DC bypass characteristics) with temperature characteristics that are superior to those of X5R or X7R, is recommended. In applications where input voltage and load fluctuations are rapid, please decide on a capacitor after sufficiently confirming its properties according to its specifications in the actual application. CTL 25kΩ 31.25kΩ Fig.23 Input equivalent circuit OUT IC 0.01 0.1 1 10 100 0 100 200 300 400 500 Iout(mA) 安定領域 発振領域 Vcc OUT CTL GND ADJ R1 R2 Cin Vcc VCTL 2V 1μF 1μF ESR Io(ROUT) R1=30kΩ,R2=2kΩ Fig.24 Output Equivalent Circuit Fig.25 ESR-Io Characteristics Oscillation region Stable region Io(mA) 0 20 40 60 80 100 120 01234 直流バイアスVdc(V) 0 20 40 60 80 100 120 01234 直流バイアスVdc(V) 0 20 40 60 80 100 120 -25 0 255075 Temp(℃) 50V Max.Input 16V Max.Input 10V Max.Input 16V Max.Input 10V Max.Input Y5V X7R X5R Vdc=0 Fig.26 :General characteristics of ceramic capacitors 50V Max.Input DC bypass Vdc(V) DC bypass Vdc(V) (a) Capacitance-bypass characteristics (Y5V) ( b)Capacitance-bypass characteristics(X5R,X7R) Temp(℃) ( C)Capacitance-temperature characteristics(X5R,X7R,Y5V) |
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