bd4140hfv ROHM Co. Ltd., bd4140hfv Datasheet - Page 3

• Manufacturer Part Number: bd4140hfv
• Description: Hi-performance Regulator Ic Series For Pcs Pgood Ic For Pc
• Manufacturer: ROHM Co. Ltd.

●Explanation of Operation
© 2009 ROHM Co., Ltd. All rights reserved.
BD4140HFV
www.rohm.com
(Detected delay time setting)
BD4140HFV is 1ch reset IC with independent supply voltage.
The following voltage is available to input VCC voltage before the watching input voltage.
(Input-output voltage characteristic)
0.5
0.5
0
5
0
TDELAY
0.5
IN [V]
(in case V
HYS=10mV(TYP)
CC
=5V)
ｔ
ｔ
ｔ
3/8
T
C
(Example) When using the 4700pF capacitor,
T
(Example) When setting 2ms Delay,
C
T
DELAY
DELAY
DELAY
EXT
EXT
[pF] = T
= 2 [ms] ×0.25 [uA] / 0.5
=
= 1×10
= 1000[pF]
[sec] =
[sec] = 2×4700 [pF]×10
is calculated with formula below.
= 2×C
= 9400×10
DELAY
-9
2×10
[sec] / (2×10
EXT
-3
0.5
C
× 0.25×10
EXT
[pF]×10
0.25 [μA]
-6
= 9.4 [ms]
[μF]×0.5
Technical Note
2009.04 - Rev.B
-6
-6
-6
)
-6