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SI-8001FFE 数据表(PDF) 3 Page - Sanken electric

部件名 SI-8001FFE
功能描述  DC-to-DC Step-Down Converter
Download  9 Pages
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制造商  SANKEN [Sanken electric]
网页  http://www.sanken-ele.co.jp/en
标志 SANKEN - Sanken electric

SI-8001FFE 数据表(HTML) 3 Page - Sanken electric

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SANKEN ELECTRIC CO., LTD.
DC-to-DC Step-Down Converter
SI-8001FFE
27469.057
SI-8000FFE
(a)
VO on/off
control only
(c)
VO on/off and
soft start control
(b)
Soft start
only
C3
SS
5
SI-8000FFE
SS
5
SI-8000FFE
SS
5
System
TTL
C3
System
TTL
Terminal List Table
Name
Number
Function
IN
1
Supply voltage
SW
2
Regulated supply output
GND
3
Ground terminal
ADJ
4
Terminal for resistor bridge feedback
SS
5
The SS terminal is used to enable soft start and to control on/off operation of the IC output,
VO (see figure 2). If neither soft start nor on/off control is used, leave pin open.
To enable soft start, connect a capacitor between SS and ground. To control on/off
operation, connect an NPN bipolar transistor, in a TTL open collector output configuration,
between the SS terminal and GND. Turn off is done by decreasing VSSL below its rated
level.
When both soft start and VO on/off are used, a protection measure such as current limiting
is required because, if the capacitance of C3 large, the discharge current of C3 flows
across the transistor for on/off operation. Because a pull-up type resistor is provided inside
the IC, no external voltage can be applied.
Pin-out Diagram
Figure 2. Alternative configurations for SS pin. If neither soft start nor VO on/off is required, the SS pin is left open.
ELECTRICAL CHARACTERISTICS1,
valid at TA = 25°C, VO = 5 V (adjusted), R1 = 4.2 kΩ, R1 = 0.8 kΩ
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Reference Voltage
VADJ
VIN = 15 V, IO = 0.2 A
0.784
0.800
0.816
V
Reference Voltage Temperature Coefficient
∆VADJ/∆TVIN = 15 V, IO = 0.2 A, TC = 0 to 100 °C
±0.1
mV/°C
Efficiency2
η
VIN = 15 V, IO = 2 A
83
%
Operating Frequency
fO
VIN = 15 V, IO = 2 A
270
300
330
kHz
Line Regulation
VLine
VIN = 10 to 30 V, IO = 2 A
80
mV
Load Regulation
VLoad
VIN = 15 V, IO = 0.2 to 3.5 A
50
mV
Overcurrent Protection Threshold Current
IS
VIN = 15 V
3.6
A
SS Terminal On/Off Operation Threshold Voltage
VSSL
0.5
V
SS Terminal On/Off Operation Outflow Current
ISSL
VSSL = 0 V
6
30
μA
Quiescent Current 1
Iq
VIN = 15 V, IO = 0 A
6
mA
Quiescent Current 2
Iq(off)
VIN = 15 V, VSS = 0 V
200
600
μA
1
Using circuit shown in Typical Application Circuit diagram.
2
Efficiency is calculated as: η(%) = ([VO × IO] × [VIN × IIN]) × 100.
12 3 4 5


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