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S-19244XXXA Datasheet(PDF) 26 Page - ABLIC Inc.

Part # S-19244XXXA
Description  AUTOMOTIVE, 125째C OPERATION, 10 V INPUT, 1000 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION
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Manufacturer  ABLIC [ABLIC Inc.]
Direct Link  https://www.ablic.com
Logo ABLIC - ABLIC Inc.

S-19244XXXA Datasheet(HTML) 26 Page - ABLIC Inc.

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AUTOMOTIVE, 125°C OPERATION, 10 V INPUT, 1000 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION
S-19244xxxA Series
Rev.3.2_00
26
Operation
1. Basic operation
Figure 28 shows the block diagram of the S-19244xxxA Series to describe the basic operation.
The error amplifier compares the feedback voltage (Vfb) whose output voltage (VOUT) is divided by the feedback
resistors (Rs and Rf) with the reference voltage (Vref). The error amplifier controls the output transistor, consequently,
the regulator starts the operation that keeps VOUT constant without the influence of the input voltage (VIN).
VOUT
*1
VSS
VIN
Rs
Rf
Error amplifier
Current
supply
Vref
Vfb
+
Reference voltage
circuit
*1. Parasitic diode
Figure 28
2. Output transistor
In the S-19244xxxA Series, a low on-resistance P-channel MOS FET is used between the VIN pin and the VOUT
pin as the output transistor. In order to keep VOUT constant, the on-resistance of the output transistor varies
appropriately according to the output current (IOUT).
Caution Since a parasitic diode exists between the VIN pin and the VOUT pin due to the structure of the
transistor, the IC may be damaged by a reverse current if VOUT becomes higher than VIN.
Therefore, be sure that VOUT does not exceed VIN
+ 0.3 V.


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