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BD4853G Datasheet(PDF) 5 Page - Rohm |
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BD4853G Datasheet(HTML) 5 Page - Rohm |
5 / 10 page Technical Note 5/9 BD48 □□G, BD48□□FVE, BD49□□G, BD49□□FVE series www.rohm.com 2009.04 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. Reference Data Examples of Leading (TPLH) and Falling (TPHL) Output Part Number TPLH ( μs) TPHL ( μs) BD4845G/FVE 39.5 87.8 BD4945G/FVE 32.4 52.4 VDD=4.3V 5.1V VDD=5.1V 4.3V *This data is for reference only. The figures will vary with the application, so please confirm actual operating conditions before use. Explanation of Operation For both the open drain type (Fig.12) and the CMOS output type (Fig.13), the detection and release voltages are used as threshold voltages. When the voltage applied to the VDD pins reaches the applicable threshold voltage, the VOUT terminal voltage switches from either “High” to “Low” or from “Low” to “High”. Because the BD48 □□G/FVE series uses an open drain output type, it is possible to connect a pull-up resistor to VDD or another power supply [The output “High” voltage (VOUT) in this case becomes VDD or the voltage of the other power supply]. Fig.12 (BD48 □□ Type Internal Block Diagram) Fig.13 (BD49 □□ Type Internal Block Diagram) Timing Waveform Example: the following shows the relationship between the input voltages VDD and the output voltage VOUT when the input power supply voltage VDD is made to sweep up and sweep down (the circuits are those in Fig.12 and 13). 1 When the power supply is turned on, the output is unsettled from after over the operating limit voltage (VOPL) until TPHL. There fore it is possible that the reset signal is not outputted when the rise time of VDD is faster than TPHL. 2 When VDD is greater than VOPL but less than the reset release voltage (VS + ∆VS), the output voltages will switch to Low. 3 If VDD exceeds the reset release voltage (VS + ∆VS), then VOUT switches from L to H. 4 If VDD drops below the detection voltage (VS) when the power supply is powered down or when there is a power supply fluctuation, VOUT switches to L (with a delay of TPHL). 5 The potential difference between the detection voltage and the release voltage is known as the hysteresis width ( ∆VS). The system is designed such that the output does not flip-flop with power supply fluctuations within this hysteresis width, preventing malfunctions due to noise. Vref R1 R2 VDD GND Q1 VOUT R3 RL Vref R1 R2 R3 Q2 Q1 VDD VOUT GND VDD VDET+ΔVDET VDET VOPL 0V TPHL ① ② VOUT TPLH TPHL TPLH ③ ④ VOL VOH ⑤ Fig.14 |
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