si-3201s Sanken Electric Co., Ltd., si-3201s Datasheet
si-3201s
Manufacturer Part Number
si-3201s
Description
Switching Type Regulator
Manufacturer
Sanken Electric Co., Ltd.
Datasheet
1.SI-3201S.pdf
(2 pages)
18
Switching Type Regulator SI-3201S
Features
Absolute Maximum Ratings
Electrical Characteristics
Recommended Operating Conditions
Notes:
*1. Efficiency is calculated by the following equation:
*2. A drooping-type overcurrent protection circuit is built in the IC.
*3. An external voltage may not be applied to the soft start terminal. As shown in the diagram to the
Soft
start
terminal
Junction to case thermal resistance
Input voltage
Output voltage
SQ terminal voltage with respect
to ground
Power Dissipation
Junction temperature
Storage temperature
Junction to ambient-air thermal
resistance
Input voltage
Output current
Operating temperature
Output voltage
Line regulation
Load regulation
Efficiency
Oscillation frequency
Quiescent circuit current
Overcurrent protection starting
current
Output current of 3A (Ta = 25ºC, V
High efficiency of 82% (V
Requires 5 external components only
Built-in reference oscillator (60kHz)
Phase internally corrected
Output voltage internally corrected
Built-in overcurrent and thermal protection circuits
Built-in soft start circuit
right, use this IC in the soft start mode with a capacitor or in the open-collector drive mode with a
transistor. Leave the soft start terminal open when not using it since it is already pulled up in the IC.
*
3
Discharge resistance
Low level voltage
Source current when low
Parameter
Parameter
Parameter
*
1
=
V
V
IN
O
• I
• I
O
IN
• 100 (%)
Symbol
Symbol
Symbol
V
V
V
Tstg
f
V
R
Top
I
P
P
V
O, SQ
V
V
O LOAD
OSC
O LINE
Iq
SSL
I
Tj
I
I
SSL
DIS
j
j
IN
O
D1
D2
IN
O
S
-c
-a
O
IN
= 14V, I
4.80
min
min
–40
0.5
3.1
50
15
8
(V
IN
IN
O
= 14V, I
= 8 to 18V)
= 2A)
–40 to +150
–40 to +125
Ratings
Ratings
Ratings
66.7
5.00
typ
typ
1.8
5.5
35
–1
22
82
60
25
3
5
OUT
= 2A, Tj = 25ºC unless otherwise specified)
5.20
100
max
max
+85
0.2
18
50
70
10
35
3
4
ºC/W
ºC/W
Unit
Unit
Unit
kHz
mV
mV
mA
ºC
ºC
ºC
k
W
W
%
V
A
V
V
A
V
A
V
A
V
I
I
V
*
With infinite heatsink
Stand-alone
Ta—P
O
O
IN
2
SSL
= 0.5 to 3A
= 0A
= 8 to 18V
= 0.2V
D
characteristics
Conditions
Conditions
Conditions
(Ta=25ºC)
External Dimensions
Standard Circuit Diagram
GND
Cautions:
(1) A high-ripple current flows through
(2)
(3)
(4) Use a Schottky barrier diode for
(5) The 4th terminal (
(6) Leave the 5th terminal (soft start terminal) open when not
(7) To ensure optimum operating environment, connect the high-
V
IN
type
Refer to the respective data books for more information on
reliability and electrical characteristics of the capacitor.
C
L
power supplies.
reverse voltage applied to the 2nd terminal (SQ terminal) is
within the maximum ratings (–1V). If you use a fast-recovery
diode, the recovery voltage and the ON forward voltage may
cause a reversed-bias voltage exceeding the maximum ratings
to be applied to the 2nd terminal (SQ terminal). Applying a
reversed-bias voltage exceeding the maximum rating to the
2nd terminal (SQ terminal) may damage the IC.
Since this terminal has a high impedance, connect it to the
positive (+) terminal of
using it. It is pulled up internally.
frequency current line with minimum wiring length.
1
3
C
should be a choke coil with a low core loss for switching
1
C
C
is a capacitor used for soft start.
a: Internal power supply
b: Thermal protection
c: Reference oscillator
d: Reset
e: Latch & driver
+
1
2
: 1000 F
: 1000 F
1000 F
SI-3201S
5
C
a
1
3
b
3.2
P1.7
10.0
2
0.2
SS
1
5
C
or higher capacitors with low internal resistance.
0.7
3
3
0.2
•4 = 6.8
V
SS
4
IN
V
5
S
c
) is an output voltage detection terminal.
0.95
0.85
0.7
SI-3201S
a
C
+0.2
–0.1
f
GND
SI-3201S
0.15
3
2
5
d
via the shortest possible route.
h
(Forming No. 1101)
1. V
2. SW
3. GND
4. V
5. SS
SS
D
i
L
g: Overcurrent protection
h: Error amplifier
f : Comparator
i : Reference voltage
b
1
1
D
IN
OS
: 250 H
: RK46 (Sanken)
e
g
0.45
1
3.9
SW Tr
OUT
C
and make sure that the
(unit: mm)
+0.2
–0.1
0.7
1
8.2
and
CQ
V
4.2
0.7
2.8
2.6
(4.3)
S
SI-3201S
0.2
C
5
0.2
4
0.1
2
2
a: Type No.
b: Lot No.
. Use high-ripple
D
1
SS
L
1
+
C
3
C
2
V
GND
O
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si-3201s Summary of contents
Page 1
... Switching Type Regulator SI-3201S Features Output current of 3A (Ta = 25ºC, V High efficiency of 82 14V Requires 5 external components only Built-in reference oscillator (60kHz) Phase internally corrected Output voltage internally corrected Built-in overcurrent and thermal protection circuits Built-in soft start circuit Absolute Maximum Ratings ...
Page 2
... Input voltage V (V) IN Efficiency Curve 18V 10V = 0.5 1.0 1.5 2.0 2.5 3.0 Output current I (A) O Ta—P Characteristics D 25 With silicone grease With infinite heatsink Heatsink: aluminum – 120 160 Operating temperature Ta (ºC) Load Regulation 5.15 5.10 5.05 5. 18V IN = 10V 4. 4.90 4.85 0 0.5 1.0 1.5 2.0 2.5 3 ...