SN317x
[ 1.5 A Adjustable Output ]
Positive Voltage Regulator
Semiconductor
http:// www.auk.co.kr
Description
The SN317 is an adjustable 3-terminal positive voltage regulator
capable of supplying in excess of 1.5 A over an output voltage range of
1.2 V to 37 V. This voltage regulator is exceptionally easy to use and
requires only two external resistors to set the output voltage. Further, it
employs internal current limiting, thermal shutdown and safe area
compensation, making it essentially blow-out proof.
This device can also be used to make a programmable output
TO-220F-3L
regulator, or by connecting a fixed resistor between the adjustment and
output, the SN317 can be used as a precision current regulator.
Application
◈
Consumer and personal electronics
◈
SMPS post-regulator / dc-to-dc modules
◈
High-efficiency linear power supplies
◈
LED Light Constant Current Controllers
D2PAK
Features and Benefits
◈
Output Current up to 1.5A
ORDERING INFORMATION
Product
SN317PI
SN317D2
Marking
SN317PI
SN317D2
Package
TO-220F-3L
D2PAK
◈
Output Adjustable Level : 1.2V to 37V
◈
Built in OVP, CLP circuit.
◈
Built in TSD Protection.
◈
Output Transistor Safe Area Protection.
◈
Ultra High level of ESD [ Built in ESD Protection Cell ]
Equivalent Circuit
VIN(3)
▲
Marking Detail Information
AUK(①)
+
G△YWW (②)
SN317PI (③)
①
AUK Logo
②
Grade & M Code & Year & Week Code
③
Device Code
Voltage
Reference
–
OVP / OCP / ESD
Protection Circuitry
R Limit
VOUT(2)
Adj(1)
KSD-I0O009-000
October, 2010 REV. 00
1
SN317x
◈
Pin Configuration
4
1
2
3
1
2
3
D2PAK
1: Adj.
2: V
OUT
3: V
IN
4: V
OUT
TO-220F-3L
1: Adj.
2: V
OUT
3: V
IN
◈
Standard Application
Ci is required if regulator is located an appreciable distance from power supply filter.
Co is not needed for stability, however, it is necessary to improve transient response.
Since I
Adj
is controlled to less than 0.1mA, the error associated with this term is insignificant
in most applications.
V
OUT
= V
ref(1.25V)
×( 1+R
2
/R
1
)+I
adj
R
2
KSD-I0O009-000
October, 2010 REV. 00
2
SN317x
◈
Absolute Maximum Ratings ( Ta = 25℃ )
Limits
Parameter
Symbol
TO-220F-3L
Input-Output Voltage Differential
D2PAK
Power Dissipation
TO-220F-3L
P
d
Internally Limited
W
V
I
-V
O
40
D2PAK
V
Unit
Thermal Resistance Junction to Case
R
ΘJC
5.0
5.0
C/W
Thermal Resistance Junction to Air
R
ΘJA
65
72
C/W
Junction Temperature
T
J
150
℃
Operate Temperature Range
T
opr
0 ~ +125
℃
Storage Temperature Range
T
stg
-55 ~ +150
℃
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only.
Functional operation above the recommended operating conditions is not implied. Extended exposure to
Stresses above the Recommended Operating Conditions may affect device reliability.
The maximum allowable power dissipation is a function of the maximum junction temperature, T
J(max)
,
the junction-to-ambient thermal resistance,
θ
JA
, and the ambient temperature, TA.
The maximum allowable power dissipation at any ambient temperature is calculated using:
PD(max) = (T
J(max)
– T
A
) ÷
θ
JA
. Exceeding the maximum allowable power dissipation will result in
excessive die temperature, and the regulator will go into thermal shutdown.
KSD-I0O009-000
October, 2010 REV. 00
3
SN317x
◈
Electrical characteristics
( V
I
-V
O
=5V, I
O
= 0.5A, I
MAX
= 1.5A, T
J
=0℃~125℃, P
DMAX
=20W ; unless otherwise specified )
SN317x
Characteristic
Symbol
Test Condition*
Min.
3.0V
≤
V
I
-V
O
≤
40V
I
O
=10mA
3.0V
≤
V
I
-V
O
≤
40V
I
O
=10mA
10mA
≤
I
O
≤
I
MAX
T
A
=+25℃
10mA
≤
I
O
≤
I
MAX
T
A
=0~+125℃
-
3.0V
≤
V
I
-V
O
≤
40V
10mA
≤
I
O
≤
I
MAX
, P
D
≤P
DMAX
3.0V
≤
V
I
-V
O
≤
40V
10mA
≤
I
O
≤
I
MAX
, P
D
≤
P
DMAX
0℃
≤
T
j
≤
125℃
V
O
=10V, f=120Hz without C
ADJ
Ripple Rejection
RR
V
O
=10V, f=120Hz, C
ADJ
= 10uF **
Output Noise Voltage
Minimum Load Current to
V
NO
10Hz
≤
f
≤
100kHz
T
A
=25℃
-
-
75.0
0.003
-
-
%
T
A
=+25℃
T
A
=0~+125℃
V
O
<
5V
V
O
≥
5V
V
O
<
5V
V
O
≥
5V
-
-
-
-
-
Typ.
0.01
0.02
18.0
0.4
40.0
0.8
50
Max.
0.04
%/V
0.07
25.0
0.5
70.0
1.5
100
mV
% / V
O
mV
% / V
O
uA
Unit
Line Regulation *
V
O(Line)
Load Regulation *
V
O(Load)
Adjustable Pin Current
I
ADJ
∆I
ADJ
V
REF
ST
T
Adjustable Pin Current Change
-
2.0
5.0
uA
Reference Voltage
Temperature Stability
1.20
-
-
1.25
1.0
65.0
1.30
-
-
V
% / V
O
㏈
Maintain Regulation
I
L(MIN)
V
I
-V
O
= 40V
-
3.5
12.0
mA
V
I
-V
O
≤
15V, P
D
≤
P
DMAX
Maximum Output Current
I
O(MAX)
V
I
-V
O
≤
40V, P
D
≤
P
DMAX
Long-Term Stability
ST
T
A
= +25℃ for end point measurements,
1000HR
T
A
=25℃
1.0
-
-
2.2
0.3
0.3
-
A
-
1.0
%
Load and line regulation are specified at constant temperature. Change in V
O
due to heating effects
must be taken into account separately. Pulse testing with low duty cycle is used.
** C
ADJ
is connected between the adjustable pin and ground.
*
KSD-I0O009-000
October, 2010 REV. 00
4
SN317x
Fig.1 Adjustable Pin Current
vs. Junction Temperature
60
50
40
30
20
10
0.0
-40
0
25
50
75
100
125
Fig.2 Load Regulation
0.2
Output Voltage Deviation [%]
Adjustable Pin Current [uA]
0.0
-0.2
IO=0.5A
IO=1.5A
-0.4
-0.6
-0.8
-1.0
-40
V
IN
=15V
V
OUT
=10V
0
25
50
75
100
125
150
V
IN
=4.25V
V
OUT
=1.25V
I
OUT
=100mA
Junction Temperature [℃]
Junction Temperature [℃]
Fig.3 Output Voltage vs. Junction Temperature
1.27
Fig.4 Dropout Voltage vs. Input Voltage
2.8
2.6
V
O
=100mV
Reference Voltage [V]
Dropout Voltage [V]
1.26
2.4
2.2
2.0
1.8
1.6
IO=0.5A
1.4
1.2
1.0
-40
IO=1.5A
1.25
1.24
1.23
-40
0
25
50
75
100
125
150
0
25
50
75
100
125
150
Junction Temperature [℃]
Junction Temperature [℃]
Fig.5 Line Transient Response
Output Voltage Deviation [mV]
Output Voltage Deviation [mV]
Input Voltage
Fig.6 Load Transient Response
Fixed 10V
20V
1.5A
Load Current
Fixed 10V
15V
0A
Output Voltage Deviation
Output Voltage Deviation
50
0.0
-50
C
IN
=0.1uF, C
OUT
=1.0uF
Iout=100mA, Ta=25℃
100
0
-100
C
IN
=0.1uF, C
OUT
=1.0uF
V
IN
=15V, Ta=25℃
0
20
40
60
80
100
120
140
0
20
40
60
80
100
120
140
Time [us]
Time [us]
KSD-I0O009-000
October, 2010 REV. 00
5
嵌入式系统
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