參數(shù)資料
型號(hào)： SI-3201S
廠商： SANKEN ELECTRIC CO LTD
元件分類： 穩(wěn)壓器
英文描述： Switching Type Regulator
中文描述： 3 A SWITCHING REGULATOR, 70 kHz SWITCHING FREQ-MAX, PZFM5
文件頁(yè)數(shù)： 1/2頁(yè)
文件大?。?/td> 29K
代理商： SI-3201S
Features
G
Output current of 3A (Ta = 25oC, V
IN
= 8 to 18V)
G
High efficiency of 82% (V
IN
= 14V, I
O
= 2A)
G
Requires 5 external components only
G
Built-in reference oscillator (60kHz)
G
Phase internally corrected
G
Output voltage internally corrected
G
Built-in overcurrent and thermal protection circuits
G
Built-in soft start circuit
Parameter
Symbol
Unit
Conditions
Ratings
Absolute Maximum Ratings
Electrical Characteristics
Recommended Operating Conditions
External Dimensions
(unit: mm)
Standard Circuit Diagram
Parameter
Symbol
min
typ
max
min
typ
max
Unit
Conditions
Ratings
(Ta=25oC)
Input voltage
Output voltage
SQ terminal voltage with respect
to ground
Power Dissipation
Output voltage
Load regulation
Line regulation
Discharge resistance
(V
IN
= 14V, I
OUT
= 2A, Tj = 25oC unless otherwise specified)
J unction temperature
Storage temperature
J unction to case thermal resistance
J unction to ambient-air thermal
resistance
V
IN
I
O
V
O, SQ
V
O
V
IN
= 8 to 18V
V
SSL
= 0.2V
4.80
5.00
82
50
60
5
3.1
5.20
100
V
50
mV
0.2
25
35
4
V
15
μ
A
k
mV
V
O
LINE
V
O
LOAD
Efficiency
I
O
= 0.5 to 3A
%
Oscillation frequency
70
kHz
f
OSC
Quiescent circuit current
I
O
= 0A
10
mA
Iq
Overcurrent protection starting
current
A
I
S
V
SSL
I
SSL
R
DIS
P
D1
P
D2
Tj
Tstg
j
-c
j
-a
Low level voltage
Source current when low
Soft
start
terminal
V
A
With infinite heatsink
Stand-alone
V
W
W
oC
oC
oC/W
oC/W
35
3
–1
22
1.8
–40 to +150
–40 to +125
5.5
66.7
Notes:
*1. Efficiency is calculated by the following equation:
O
I
O
V
IN
I
IN
*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
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.
a
b
1
2
3
4
5
10.0
3.2
0
4
7
1
0.95
0.85
P1.7 4=6.8
4.2
±
0.2
2.8
±
0.2
2.6
±
0.1
3.9
8.2
±
0.7
±
0.7
0.45
–0.1
+0.2
–0.1
+0.2
(
5
±
0
(
(
(
(4.3)
1. V
IN
2. SW
OUT
3. GND
4. V
OS
5. SS
a: Type No.
b: Lot No.
(Forming No. 1101)
Parameter
Symbol
Unit
Conditions
Ratings
Input voltage
Output current
Operating temperature
V
IN
I
O
Top
V
A
Ta—P
D
characteristics
oC
8
0.5
–40
18
3
+85
18
Switching Type Regulator SI-3201S
= V
SS
5
SS
C
3
C
3
5
SS
5
SI-3201S
SI-3201S
SI-3201S
SI-3201S
V
IN
V
IN
C
1
C
3
C
2
C
1
: 1000
μ
F
C
2
: 1000
μ
F
L
1
: 250
μ
H
D
1
: RK46 (Sanken)
V
O
CQ
SW Tr
L
1
D
1
V
S
GND
GND
GND
3
5
4
2
1
SS
+
+
a
e
d
b
g
c
h
i
f
a: Internal power supply
b: Thermal protection
c: Reference oscillator
d: Reset
e: Latch & driver
f: Comparator
g: Overcurrent protection
h: Error amplifier
i : Reference voltage
Cautions:
(1) A high-ripple current flows through
C
1
and
C
2
. Use high-ripple
type
1000
μ
F
or higher capacitors with low internal resistance.
Refer to the respective data books for more information on
reliability and electrical characteristics of the capacitor.
(2)
C
3
is a capacitor used for soft start.
(3)
L
1
should be a choke coil with a low core loss for switching
power supplies.
(4) Use a Schottky barrier diode for
D
1
and make sure that the
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.
(5) The 4th terminal (
V
S
) is an output voltage detection terminal.
Since this terminal has a high impedance, connect it to the
positive (+) terminal of
C
2
via the shortest possible route.
(6) Leave the 5th terminal (soft start terminal) open when not
using it. It is pulled up internally.
(7) To ensure optimum operating environment, connect the high-
frequency current line with minimum wiring length.
*
1
*
3
*
2
±
0.2
±
0.2
±
0
±
0
±
0
±
0.15
±
0.7
±
0.7
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