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BU4809F-TR 数据表(PDF) 11 Page - Rohm |
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BU4809F-TR 数据表(HTML) 11 Page - Rohm |
11 / 19 page 11/15 BU48xx series BU49xx series TSZ02201-0R7R0G300060-1-2 © 2015 ROHM Co., Ltd. All rights reserved. 02.Nov.2015 Rev.012 www.rohm.com TSZ22111・15・001 3) Examples of the power supply with resistor dividers In applications where the power supply input terminal (VDD) of an IC is connected through 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 leve l switches from “High” to “Low” or vice versa.) Fig.18 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 BD48xx when the power supply input it with resistor dividers. Fig.19 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 BU48xx BU49xx GND R1 I1 V1 CIN CL IDD VDD VDET 0 Through Current 0.001 0.01 0.1 1 10 3 4 5 6 7 8 9 10 VDD[V] VDD - IDD Peak Current Ta=25°C BU49xx,BU43xx BU48xx,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 |
类似零件编号 - BU4809F-TR |
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类似说明 - BU4809F-TR |
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