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TDA8137 数据表(PDF) 4 Page - STMicroelectronics

部件名 TDA8137
功能描述  DUAL 5.1V REGULATOR WITH DISABLE AND RESET
Download  5 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TDA8137 数据表(HTML) 4 Page - STMicroelectronics

  TDA8137 Datasheet HTML 1Page - STMicroelectronics TDA8137 Datasheet HTML 2Page - STMicroelectronics TDA8137 Datasheet HTML 3Page - STMicroelectronics TDA8137 Datasheet HTML 4Page - STMicroelectronics TDA8137 Datasheet HTML 5Page - STMicroelectronics  
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background image
4
2
1
RESET
V
O1
V
IN1
V
O2
C1
C3
DISABLE
TDA8137
5
3
6
7
C1
C3 = 10
µF
.
.
Ce
C2
TYPICAL APPLICATION
CIRCUIT DESCRIPTION
The TDA8137 is a dual voltage regulator with Reset
and Disable.
The two regulation parts are supplied from one
voltage reference circuit trimmed by zener zap
during EWS test. Since the supply voltage of this
last is connected at Pin 1 (VIN1), the regulator 2 will
not work if the Pin 1 is not supplied.
The outputs stages have been realized in dar-
lington configuration with a drop typical of 1.2V.
The disable circuit, switches off the output 2 if a
voltage lower than 0.8V is applied at pin 3.
The Reset circuit checks the voltage at the output
1. If this one goes below VOUT - 0.25V (4.85V Typ.),
the comparator "a" (see Figure 1) discharges rap-
idly the capacitor Ce and the reset output goes at
once low. When the voltage at the OUT 1 rises
above VOUT -0.2V (4.9V Typ.), the voltage VCe
increases linearly to 2.5V corresponding to a delay
td following the low : td
=
Ce
⋅ 2.5V
10
µA
(see figure 2),
then the reset output goes high again. To avoid
glitches in the reset output, the second comparator
"b" has a large hysteresis (1.9V).
TDA8137
4/5


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