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BD12TD2WNVX-TL Datasheet(PDF) 3 Page - Rohm |
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BD12TD2WNVX-TL Datasheet(HTML) 3 Page - Rohm |
3 / 41 page Technical Note 3/40 BU□□TD2WNVX Series www.rohm.com 2010.02 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. Fig.4 Stability area characteristics (Example) 0.01 0.1 1 10 100 0 50 100 150 200 IOUT [mA] ● Block diagram, recommended circuit diagram, and pin configuration diagram BU□□TD2WNVX ● Input / Output terminal equivalent circuit schematic 1pin (VOUT) 2pin (GND) 3pin (STBY) 4pin (VIN) Fig.2 Input/Output equivalent circuit ● About input/output capacitor It is recommended to place a capacitor as close as possible to the pins between the input terminal and GND or between the output terminal and GND. The capacitor between the input terminal and GND becomes valid when source impedance increases or when wiring is long. The larger the capacity of the output capacitor between the output terminal and GND is, the better the stability and characteristics in output load fluctuation become. However, please check the status of actual implementation. Ceramic capacitors generally have variation, temperature characteristics, and direct current bias characteristics and the capacity value also decreases with time depending on the usage conditions. It is recommended to select a ceramic capacitor upon inquiring about detailed data of the related manufacturer. ● About the equivalent series resistance (ESR) of a ceramic capacitor Capacitors generally have ESR (equivalent series resistance) and it operates stably in the ESR-IOUT area shown on the right. Since ceramic capacitors, tantalum capacitors, electrolytic capacitors, etc. generally have different ESR, please check the ESR of the capacitor to be used and use it within the stability area range shown in the right graph for evaluation of the actual application. PIN No. Symbol Function 1 VOUT Voltage output 2 GND Grounding 3 STBY ON/OFF control of output voltage (High: ON, Low: OFF) 4 VIN Power input Fig.3 Capacity – bias characteristics 4 3 1 2 Cin VIN GND STBY VSTBY VOUT VOUT Co VREF OCP STBY Discharge TSD VIN Fig.1 Recommended circuit diagram Recommended ceramic capacitor for Cin & Co Murata Manufacturing Co., Ltd. GRM188B11A474KA61D Capacity value of ceramic capacitor - DC bias characteristics ( Example) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 00.5 1 1.5 22.53 3.54 DC Bias Voltage [V] 10-V withstand voltage B1characteristics GRM188B11A105KA61D 10-V withstand voltage B characteristics 6.3-V withstand voltage B characteristics 4-V withstand voltage X6S characteristics 10-V withstand voltage F characteristics 10-V withstand voltage F characteristics Stable region Unstable region Cout=0.47μF ,Cin=0.47μF ,Temp=+25℃ |
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