datasheetbank_Logo
Integrated circuits, Transistor, Semiconductors Search and Datasheet PDF Download Site

TDA8133D_09 View Datasheet(PDF) - STMicroelectronics

Part Name
Description
View to exact match
TDA8133D_09 Datasheet PDF : 14 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Circuit description
3
Circuit description
TDA8133
The TDA8133 and the TDA8133D 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 (VIN1), the second regulator will not work if pin INPUT1 is not
supplied.
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 VO1 -
0.25 V (4.85 V Typ.), the "a" comparator (Figure 4) rapidly discharges the external capacitor
(Ce) and the reset output immediately switches to low. When the voltage at pin OUTPUT1
) exceeds VO1 - 0.2 V (4.9 V Typ.), the VCe voltage increases linearly to the reference voltage
t(s (VREF = 2.5 V) corresponding to a reset pulse delay (tRD) as shown in Figure 5.
uc tRD = C-----e--1--×-0----μ-2--A-.--5----V--
rod Afterwards, the reset output returns to high. To avoid glitches in the reset output, the second
P comparator "b" has a large hysteresis (1.9 V).
te Figure 4. Reset diagram
sole 10 µA
t(s) - Ob OUTPUT1
VREF
+a
- 50
c REG
Obsolete Produ VREF = 2.5 V
3
Ce
-b
+
VREF 0.6V
RESET
6/14
 

Share Link: 

datasheetbank.com [ Privacy Policy ] [ Request Datasheet ] [ Contact Us ]