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BD53E32 Datasheet(PDF) 11 Page - Rohm |
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BD53E32 Datasheet(HTML) 11 Page - Rohm |
11 / 15 page Datasheet 11/12 BD52Exxx series BD53Exxx series TSZ02201-0R7R0G300080-1-2 © 2013 ROHM Co., Ltd. All rights reserved. 22.May.2013 Rev.004 www.rohm.com TSZ22111 ・ 15 ・ 001 3) Examples of the power supply with resistor dividers In applications wherein the power supply voltage of an IC comes from a resistor divider circuit, an in-rush current will flow into the circuit when the output level switches from “High” to “Low” or vice versa. In-rush current is a sudden surge of current that flows from the power supply (VDD) to ground (GND) as the output logic changes its state. This current flow may cause malfunction in the systems operation such as output oscillations, etc. Figure.21 When an in-rush current (I1) flows into the circuit (Refer to Fig. 21) at the time when output switches from “Low” to “High”, a voltage drop of I1×R2 (input resistor) will occur in the circuit causing the VDD supply voltage to decrease. When the VDD voltage drops below the detection voltage, the output will switch from “High” to “Low”. While the output voltage is at “Low” condition, in-rush current will stop flowing and the voltage drop will be reduced. As a result, the output voltage will switches again from “Low” to “High” which causes an in-rush current and a voltage drop. This operation repeats and will result to oscillation. Figure.22 IDD Peak Current 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 BD52Exxx BD53Exxx GND R1 I1 V1 CIN CL IDD VDD VDET 0 Through Current V D D - I D D P eak C ur r ent T a=25°C 0. 001 0. 01 0. 1 1 10 3 4 5 6 7 8 9 10 V D D [ V ] B D 52E xxx B D 53E xxx |
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