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SI-8000S Fiches technique(PDF) 6 Page - Sanken electric

No de pièce SI-8000S
Description  Full-Mold, Separate Excitation Switching Type
Download  6 Pages
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Fabricant  SANKEN [Sanken electric]
Site Internet  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

SI-8000S Fiches technique(HTML) 6 Page - Sanken electric

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85
1. Soft Start
Connecting a capacitor to terminal no. 5 permits a soft start at power-
on. Delay time Td and rise time Ts can roughly be calculated as
shown below. (However, the values may slightly vary in an actual
application.) If the capacitance of C3 is increased, it takes longer to
discharge C3 after VIN is turned off. Therefore, it is recommended to
set the value within 10
µF. When not using the soft start function,
keep terminal no. 5 open.
Td=
0.7
×C3
(sec)
20
×10–6
Ts=
4.845
×C3
(sec)
VIN
×20×10–6
SI-8000S
S.S.
C3
VIN
VO
Td
TS
5
2. Output ON/OFF control
Output can be turned on and off by using the soft start terminals.
Set the soft start terminal voltage to VSSL (0.2V typ.) or less to stop
output. To switch the potential at the soft start terminals, drive the
open collector of the transistor. Since the discharge current from C3
flows to the ON/OFF control transistor, limit the current for protec-
tion. The SS terminal is pulled up to the power supply in the IC and
no external voltage can be applied.
SI-8000S
S.S + ON/OFF
S.S.
5
C3
SI-8000S
S.S.
5
ON/OFF
Applications
qSI-8000S Series
(3) Sensing terminal
Output voltage sensing terminal VOS should be connected as close
to output capacitor C2 as possible. If the terminal is far from the
capacitor, the decreasing regulation and increasing switching
ripple may result in abnormal oscillation.
+
L1
5
VOUT
VIN
GND
C1
C2
D1
SI-8000S
Example of basic pattern
Top view (with part names)
3. Variable Output Voltage
The output voltage can be increased by connecting a resistor to VOS
terminal No. 4. (There is no way of decreasing the voltage)
(1) Variable output voltage with single external resistor
SI-8000S
2
4
VO'
GND
C2
REX
VS
IVS
L
3
The output voltage adjustment resistance REX is calculated
as follows:
REX=
VO'–VS
IVS
VS : Set output voltage of product
VO' : Adjusted output voltage
IVS : Inflow current to Vs terminal
* The temperature characteristics of output voltage worsen because
the value REX is not compensated for temperature. The Vs value
fluctuates by up to
±20% depending on the IC product. Since the
output voltage fluctuates more, a semi-fixed resistor is necessary
for accurate output voltage adjustment. If Vs and REX are constant,
the range of output voltage fluctuation can be expressed as follows:
∆VO'(%)=±20•
VO'–VS
VO'
∆VO':Adjusted output voltage
(2) Variable output voltage with two external resistors
SI-8000S
2
4
VO
GND
C2
REX1
REX2
IREX1
IVS
VS
L
3
The output voltage adjustment resistances REX1 and REX2 are
calculated as follows:
REX1=
VO'–VS
S•IVS
REX2=
VS
(S-1)•IVS
S:Stability factor
Bypassing the current to REX2 improves the temperature charac-
teristics and voltage fluctuation ranges more than the method of
(1). Stability factor S indicates the ratio of REX1 to Vs terminal
inflow current. Increasing the S value improves the fluctuations
of the temperature characteristics and output voltage. (Usually 5
to 10)
If the Vs and REX values are constant, the output voltage fluctua-
tion range can be calculated as follows:
∆VO'(%)=
±20
VO'–VS
S
VO'


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