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參數(shù)資料
| 型號： | STV8130AD |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | ADJUSTABLE AND +3.3 V DUAL VOLTAGE REGULATOR WITH DISABLE AND RESET FUNCTIONS |
| 中文描述： | 可調(diào)3.3伏雙電壓調(diào)節(jié)器禁用和復(fù)位功能 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 135K |
| 代理商： | STV8130AD |
CIRCUIT DESCRIPTION
STV8130AD
6/12
3
CIRCUIT DESCRIPTION
The STV8130A
#
and STV8130D
#
are dual-voltage regulators with Reset and Disable functions.
The two regulation parts are supplied from a single voltage reference circuit trimmed by zener
zapping during EWS testing. Since the supply voltage of this voltage reference is connected to pin
INPUT1 (V
IN1
), the second regulator will not work if pin INPUT1 is not supplied.
The adjustable voltage of pin OUTPUT2 (V
OUT2
) is defined by output bridge resistors (R1, R2): the
values of these resistors are calculated to obtain, with the targetted value for V
OUT2
, the reference
voltage (V
REF
= 2.44 V) on the median point connected to pin PROGRAM.
The output stages are designed using a Darlington configuration with a typical dropout voltage of
1.2 V.
The Disable circuit will switch off pin OUTPUT2 if a voltage less than 0.8 V is applied to pin
DISABLE.
The Reset circuit checks the voltage at pin OUTPUT1. If this voltage drops below V
OUT1
- 0.25 V
(3.05 V Typ.), the "a" comparator (
Figure 3
) rapidly discharges the external capacitor (Ce) and the
reset output immediately switches to low. This drop can be caused by a parasitic loading condition
on pin OUTPUT1 or by a too low value of V
IN
(short powering off). When the voltage at pin
OUTPUT1 exceeds V
OUT1
- 0.2 V (3.1 V Typ.), the V
Ce
voltage increases linearly to the reference
voltage (V
REF
= 2.44 V) corresponding to a Reset Pulse Delay (t
RD
) as shown in
Figure 4
.
C
2.44V
Afterwards, the reset output returns to high. To avoid glitches in the reset output, the second
comparator "b" has a large hysteresis (1.84 V).
Figure 3: Reset Diagram
Figure 4: Internal Reset Voltages
t
RD
×
----------------------------
=
OUTPUT1
REG
V
REF
-
+
50
a
+
-
Ce
V
REF
0.6V
b
RESET
10 μA
3
V
REF
= 2.44 V
RESET
K
V
RTH
V
O1RST
t
RD
t
RD
V
OUT1
Power On
Power Off
K = Actual Value of V
OUT1
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