BD3951F Просмотр технического описания (PDF) - ROHM Semiconductor

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BD3951F

Regulator with Voltage Detector IC

ROHM Semiconductor 

BD3951F

●Input/Output terminal Circuit

SIN(2pin)

Vcc

SIN(2pin)

200k

RADJ(3pin)

Vcc

RADJ(3pin)

340

RES(6pin)

OUT(8pin)

20k

RES(6pin)

SOUT(7pin)

OUT(8pin)

20k

SOUT(7pin)

Technical Note

CT(4pin)

300k

Vcc

4.1k

CT(4pin)

OUT(8pin)

Vcc

1260k

420k

OUT(8pin)

Fig.15

●How to set RESET delay time using CT terminal capacitor

There are three factors to define the RESET delay time TdLH. External capacitor value Cct of the CT terminal, internal

charge resistor and internal reference voltage. RESET delay time is approximately described as below equation.

(TYP): TdLH≒300K × Cct(sec)

Internal charge resistor 300k has some inaccuracy. The deviation of this inaccuracy is shown in Fig. 16. However, as

TdLH delay time may be effected by application board, application board test is recommended to select the right Cct.

10,000

1,000

100

(MAX): TdLH≒530k×Cct

(TYP): TdLH≒300k×Cct

(MIN): TdLH≒170k×Cct

10

1

0.01

0.1

1

10

Cct[μF]

Fig.16

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© 2009 ROHM Co., Ltd. All rights reserved.

2009.07 - Rev.A

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