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S-1111B35MC-NYUTFG Datasheet(PDF) 14 Page - Seiko Instruments Inc

No. de pieza S-1111B35MC-NYUTFG
Descripción Electrónicos  HIGH RIPPLE-REJECTION LOW DROPOUT
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Fabricante Electrónico  SII [Seiko Instruments Inc]
Página de inicio  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-1111B35MC-NYUTFG Datasheet(HTML) 14 Page - Seiko Instruments Inc

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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1111/1121 Series
Rev.4.1_00
Seiko Instruments Inc.
14
Operation
1. Basic operation
Figure 11 shows the block diagram of the S-1111/1121 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 output transistor with the gate voltage necessary
to ensure a certain output voltage free of any fluctuations of input voltage and temperature.
Reference voltage
circuit
VOUT
*1
*1.
Parasitic diode
VSS
VIN
Rs
Rf
Error
amplifier
Current
supply
Vref
+
Vfb
Figure 11
2. Output transistor
The S-1111/1121 Series uses a low on-resistance P-channel MOS FET 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 flowing from VOUT pin through a parasitic diode to VIN pin.


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