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S-19214 датащит (PDF) 18 Page - ABLIC Inc.

№ деталь S-19214
подробность  AUTOMOTIVE, 125°C OPERATION, 36 V INPUT, 1000 mA VOLTAGE REGULATOR
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производитель  ABLIC [ABLIC Inc.]
домашняя страница  https://www.ablic.com
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S-19214 Datasheet(HTML) 18 Page - ABLIC Inc.

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AUTOMOTIVE, 125°C OPERATION, 36 V INPUT, 1000 mA VOLTAGE REGULATOR
S-19214 Series
Rev.1.1_00
18
Operation
1. Basic operation
Figure 20 shows the block diagram of the S-19214 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 20
2. Output transistor
In the S-19214 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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