qSI-8000S
Series
sBlock
Diagram
V
IN
1
Reg.
OSC
Reset
OCP
2 SW
OUT
Drive
Comp.
TSD
4 V
OS
Amp.
V
REF
5 S.S.
3 GND
sStandard
External Circuit
V
IN
1
2
V
IN
SW
OUT
L
1
V
O
+
C
1
SI-8000S
V
OS
S.S
5
GND
3
4
C
1,2
: 1000µF
D
1
+
C
2
L
1
: 150µH
D
1
: RK46(Sanken)
GND
GND
sT
a
-P
D
Characteristics
P
D
=V
O
•I
O
20
Infinite heatsink
100
–1
ηχ
–V
F
•I
O
1–
V
O
V
IN
With Silicon Grease
Heatsink: Aluminum
Power Dissipation P
D
(W)
15
200×200×2mm
(2.3°C/W)
The efficiency depends on the input voltage and the out-
put current. Thus, obtain the value from the efficiency graph
on page 83 and substitute the percentage in the formula
above.
V
O
: Output voltage
V
IN
: Input voltage
I
O
: Output current
ηx
: Efficiency (%)
V
F
: Diode forward voltage
0.5V(RK46)
Thermal design for D
1
must be considered separately.
100×100×2mm
10 (5.2°C/W)
75×75×2mm
(7.6°C/W)
5
Without heatsink
0
–25
0
25
50
75
100
125
Ambient Operating Temperature T
a
(°C)
82
SANKEN [ SANKEN ELECTRIC ]
