1-1-1 Linear Regulator ICs
sBlock
Diagram
qSI-3010KD/SI-3012KD
V
IN
2
4 V
O
SI-3018KD/SI-3025KD/SI-3033KD/SI-3050KD/SI-3090KD/SI-3120KD
V
IN
2
4 Vo
5
V
C
1
-
+
5 ADJ
TSD
V
C
1
-
+
Sense
TSD
REF
3 GND
REF
3 GND
sTypical
Connection Diagram
qSI-3018KD/SI-3025KD/SI-3033KD/
SI-3050KD/SI-3090KD/SI-3120KD
qSI-3010KD/SI-3012KD
D1
*2
*1
D1
*2
R3
*3
*1
V
IN
2
+
V
O
4
+
V
IN
2
+
V
O
4
R1
+
C
IN
V
C
1
sense
GND 5
3
C
O
Load
C
IN
V
C
GND ADJ
1
5
3
C
O
Load
R2
C
IN
: Input capacitor (22
µ
F or larger)
C
O
: Output capacitor
*1: SI-3012KD/3018KD/3025KD/3033KD (22
µ
F or larger)
Co has to be a low ESR capacitor such as a ceramic capacitor.
When using the electrolytic capacitor, oscillation may occur at a low temperature.
SI-3010KD/3050KD/3090KD/3120KD (47
µ
F or larger)
If a low ESR capacitor is used, oscillation may occur.
*2: D1: Reverse bias protection diode
This diode is required for protection against reverse biasing between the input
and output.
(Sanken SJPL-F2 is recommended.)
This diode is not required at V
O
3.3V.
R1, R2: Output voltage setting resistors
The output voltage can be set by connecting R1 and R2 as shown
above.
The recommended value for R2 is 10Ω (24kΩ for SI-3012KD).
R1=(V
O
–V
ADJ
)
÷
(V
ADJ
/R2)
*3: For SI-3010KD, insert R3 in case of setting V
O
to V
O
1.5V.
The recommended value for R3 is 10kΩ.
sReference
Data
Copper Laminate Area (on Glass-Epoxy Board) vs.
Thermal Resistance (from Junction to Ambient Temperature) (Typical Value)
55
Junction to Ambient Temperature
Thermal Resistance
θ
j-a (°C/W)
50
45
40
35
30
0
When Using Glass-Epoxy Board of 40
×
40 mm
• A higher heat radiation effect can be achieved by enlarging the copper laminate
area connected to the inner frame to which a monolithic ICs is mounted.
• Obtaining the junction temperature
Measure the case temperature T
C
with a thermocouple, etc. Then, substitute
this value in the following formula to obtain the junction temperature.
T
j
=P
D
× θ
j–C
+ T
C
(
θ
j–C
= 3
°
C/W) P
D
= (V
IN–
V
O
)•I
OUT
200
400
600
800
1000
1200
1400
1600
1800
Copper Laminate Area (mm
2
)
20
ICs
Home Index Bookmark Pages Text
Previous Next
Pages: Home Index