NJM2827 Просмотр технического описания (PDF) - Japan Radio Corporation

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NJM2827

Negative Output Low Drop Out voltage regulator

Japan Radio Corporation  

NJM2827

¿Soft-start function

Capacitance Cs connect between CS pin and GND for the following.

• Control at risetime of output voltage.

• Reduces inrush current at output ON.

When the soft start function is not used, CS pin should be open.

1.Cs capacitance vs risetime of output voltage

Calculation : risetime of output voltage ∆t ≅ 213 x Cs(µF)

Cs capacity vs risetime of output voltage

250

200

150

100

50

0

0

@:Ta=25oC

V IN=6 V

CIN=0.1µF

Co =1 µF(Ceramic)

Io=0mA

0.2

0.4

0.6

0.8

1

1.2

Cs capacity : Cs(µF)

2.Inrush current at control ON

The peak value of the inrush current can be limited according to the capacitance of the Cs.

Inrush current wave :

Output Voltage

Output Voltage

Inrush current

Inrush current

Vin=Vo-1V

Cin=0.1µF(Ceramic)

Co=1µF(Ceramic)

Io=0mA

50mA/div

Cs=0µF(Open) : IPEAK =150µA

Inrush Peak Current=150mA(Cs=Open)

Vin=Vo-1V

Cin=0.1µF(Ceramic)

Co=1µF(Ceramic)

Io=0mA

20mA/div

Cs=0.0047µF : IPEAK =20µA

Inrush Peak Current=20mA(Cs=0.0047µF)

٭This characteristic is one example. It is necessary to examine the characteristic with an actual circuit

because there is an influence by the characteristic such as output voltage/output capacitor.

Ver.2010-07-13

-5-

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