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sBlock Diagram
sStandard External Circuit
sReference Data
CO : Output capacitor (22
µF or larger)
CIN : Input capacitor (0.1 to 10
µF)
This capacitor is required in the case of an inductive
input line or long wiring.
Tantalum capacitors are recommended for C1 and C0,
particularly at low temperatures.
* Leave pin 2 open.
TSD
+
–
VIN
NC
VIN
VC
VO
VO
GND
GND
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
+
VIN
VIN
VC
VO
CIN
CO
GND
+
PWB Copper Laminate Area vs. Junction
to Ambient Air Thermal Resistance
Allowable Output Current
(vs. VIN-VOUT Voltage Difference)
VIN-IO max
qSI-3000LSA Series
150
140
130
120
110
100
90
80
70
100
1000
5000
Copper Laminate Area (mm2)
PWB (glass-epoxy, 40
×40mm)
160mm (40
×40) mm
1.2
1.0
0.8
0.6
0.4
0.2
0
1234
VIN-VOUT Voltage Difference (V)
Tj = 120
°C (20% derating of 150°C)
Ta=25
°C
Ta=85
°C
j-a
=100
°C/W
The inner frame stage, on which the PTr is mounted, is directly connected to the VOUT pin.
Therefore, enlarging the copper laminate area achieves a heat radiation effect of the VOUT pin.
θ