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BU4219 Datasheet(PDF) 7 Page - Rohm |
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BU4219 Datasheet(HTML) 7 Page - Rohm |
7 / 12 page Technical Note 7/11 BU42□□G series, BU42□□F series, BU42□□FVE series, BU43□□G series, BU43□□F series, BU43□□FVE series www.rohm.com 2009.11 - Rev.C © 2009 ROHM Co., Ltd. All rights reserved. 2) Examples of the power supply with resistor dividers In applications where the power supply input terminal (VDD) of an IC with resistor dividers, it is possible that a through current will momentarily flow into the circuit when the output logic switches, resulting in malfunctions (such as output oscillatory state). (Through-current is a current that momentarily flows from the power supply (VDD) to ground (GND) when the output level switches from “High” to “Low” or vice versa.) Fig.20 A voltage drop of [the through-current (I1)] × [input resistor (R2)] is caused by the through current, and the input voltage to descends, when the output switches from “Low” to “High”. When the input voltage decreases and falls below the detection voltage, the output voltage switches from “High” to “Low”. At this time, the through-current stops flowing through output “Low”, and the voltage drop is eliminated. As a result, the output switches from “Low” to “High”, which again causes the through current to flow and the voltage drop. This process is repeated, resulting in oscillation. Consider the use of BU42□□ when the power supply input it with resistor dividers. Fig.21 Current Consumption vs. Power Supply Voltage * This data is for reference only. The figures will vary with the application, so please confirm actual operating conditions before use. VOUT R2 VDD BU42□□ BU43□□ GND R1 I1 V1 CIN CL IDD VDD VDET 0 Through Current VDD - IDD Peak Current Ta=25 °C 0.001 0.01 0.1 1 10 34 56 78 9 10 VDD[V] BU43xx BU42xx BD52xx BD53xx Temp - IDD(BU42xx) 0.0 0.5 1.0 1.5 2.0 2.5 -50 -30 -10 10 30 50 70 90 110 130 Temp VDD3V VDD6V VDD7V VDD4V |
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