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S-812C48BPI-C5CTFG Datasheet(PDF) 16 Page - Seiko Instruments Inc

Part # S-812C48BPI-C5CTFG
Description  HIGH OPERATING VOLTAGE CMOS VOLTAGE REGULATOR
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-812C48BPI-C5CTFG Datasheet(HTML) 16 Page - Seiko Instruments Inc

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HIGH OPERATING VOLTAGE CMOS VOLTAGE REGULATOR
S-812C Series
Rev.4.0_00
Seiko Instruments Inc.
16
Operation
1. Basic Operation
Figure 16 shows the block diagram of the S-812C Series.
The error amplifier compares the reference voltage (Vref) with 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.
Reference
voltage
circuit
VOUT
*1
VSS
VIN
RS
Rf
Error amplifier
Current supply
Vref
+
*1. Parasitic diode
Figure 16
2. Output Transistor
In the S-812C 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 inverse current which flows, because of a parasitic diode between the VIN and VOUT pin.


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