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SI-8008TM bảng dữ liệu(PDF) 4 Page - Sanken electric

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nhà sản xuất  SANKEN [Sanken electric]
Trang chủ  http://www.sanken-ele.co.jp/en
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DC/DC Step-Down Converter IC
SI-8000TM Series
September 2005
Sanken Electric Co.,Ltd.
I02-001EA-050910
*3
Efficiency is calculated by the following equation.
*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.
4-2 Typical characteristics (Ta=25℃)
(1)
Efficiency
η
(%)=
×
100
VO・IO
VIN・IIN
VO.ON/OFF
Soft start
+VO.ON/OFF
C3
5
SS
Soft start
C3
SI-8000TFE
SI-8000TFE
SI-8000TFE
5
SS
5
SS
SI-8000TM
SI-8000TM
SI-8000TM
Efficiency
Efficiency
SI-8008TM/TFE 効率特性
Ta=25℃ Vo=5v設定時
55
60
65
70
75
80
85
00.511.5
Iout A
VIN=
8v,10v,15v,20v,30v,
40v
Vo=5V adjusted:R1=42kΩ R2=08kΩ
Efficincy Curve
SI-8008TM Efficiency Curve
Vo=5V Adjusted:R1=4.2kOhm, R2=0.8kOhm
4/15


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