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SL2980 Arkusz danych(PDF) 11 Page - Seiko Instruments Inc

Numer części SL2980
Szczegółowy opis  HIGH RIPPLE-REJECTION AND LOW DROPOUT
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Producent  SII [Seiko Instruments Inc]
Strona internetowa  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

SL2980 Arkusz danych(HTML) 11 Page - Seiko Instruments Inc

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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.5.1_00
S-L2980 Series
Seiko Instruments Inc.
11
Operation
1. Basic Operation
Figure 11 shows the block diagram of the S-L2980 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 11
2. Output Transistor
In the S-L2980 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 flowing from the VOUT pin through a parasitic diode to the VIN pin.


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