SI-8033TM View Datasheet(PDF) -

DC/DC Step-Down Converter IC

SI-8000TM Series

September 2005

*3 Efficiency is calculated by the following equation.

VO･IO

η(%)= VIN･IIN ×100

*4 No.5 terminal is a SS terminal to enable soft start by connecting a capacitor. The output can

be turned on and off by using a SS terminal. The output is stopped by decreasing the SS

terminal voltage below VSSL and in order to perform ON/OFF operation of Vout, it is required

to connect NPN transistor or the output of open collector type TTL between No.5 terminal

and GND.

In case that both soft and Vout ON/OFF are used, a protection measure such as limitation of

current is required, as the discharge current of C3 flows across a transistor for ON/OFF

operation, if the capacitance of C3 large. As a pull-up type resistor is provided inside the IC,

no external voltage can be applied. In case of no use of ON/OFF, please keep it open.

SSII--8000000TTMFE

5 SS

SSII--800000TTMFE

5 SS

C3

SSII--8800000TTMFE

5 SS

C3

VO.ON/OFF

Soft start

Soft start

+VO.ON/OFF

4-2 Typical characteristics (Ta=25℃)

（１）Efficiency

SI-80S0I8-T8M00E8TffMic／ieEnTEfcfFfyiEfcEiCifc　nfiiuecc効rnyivec率Cneycuy特rv性e

Vo=5VTaA=d2ju5℃ste　dV：VooR==155=vV4設a.2d定kjuO時shtemd：, RR21==04.82kkOΩhmR2=0 8kΩ

85

80

75

70

65

VIN=

8v,10v,15v,20v,30v,

40v

60

55

0

0.5

1

1.5

Iout　A

Sanken Electric Co.,Ltd.

4/15

I02-001EA-050910

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