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S-1112B21MC-L6GTFX 데이터시트(PDF) 14 Page - ABLIC Inc.

부품명 S-1112B21MC-L6GTFX
상세설명  HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
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제조업체  ABLIC [ABLIC Inc.]
홈페이지  https://www.ablic.com
Logo ABLIC - ABLIC Inc.

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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_02
14
Operation
1. Basic operation
Figure 12 shows the block diagram of the S-1112/1122 Series.
The error amplifier compares the reference voltage (Vref) with feedback voltage (Vfb), which is the output
voltage resistance-divided by feedback resistors (Rs and Rf). It supplies the gate voltage necessary to
maintain the constant output voltage which is not influenced by the input voltage and temperature
change, to the output transistor.
*1
*1. Parasitic diode
VSS
Current
supply


Vfb
Vref
VIN
VOUT
Rf
Rs
Error
amplifier
Reference voltage
circuit
Figure 12
2. Output transistor
In the S-1112/1122 Series, a low on-resistance P-channel MOS FET is used as the output transistor.
Be sure that VOUT does not exceed VIN  0.3 V to prevent the voltage regulator from being damaged due
to reverse current flowing from the VOUT pin through a parasitic diode to the VIN pin, when the potential
of VOUT became higher than VIN.


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