COM137T
(COTS) COMMERCIAL OFF-THE-SHELF 1.5 AMP NEGATIVE,
ADJUSTABLE VOLTAGE REGULATOR IN TO-257 PKG
Three Terminal, Precision Adjustable
Negative Voltage Regulator In TO-257 Package
FEATURES
• Built In Thermal Overload Protection
• Short Circuit Current Limiting
DESCRIPTION
These three terminal negative regulators are supplied in hermetically sealed pack-
ages. All protective features are designed into the circuit, including thermal shutdown,
current-limiting, and safe-area control. With heat sinking, these devices can deliver
up to 1.5 amps of output current. The unit also features output voltages that can be
fixed from -1.2 volts to -37 volts using external resistors.
ABSOLUTE MAXIMUM RATINGS
T
c
@
25°C
Power Dissipation
TO27 .................. ...... .... ...........................
-5.
. 20 W
Input - Output Voltage Diffrnil.................................... 4
eeta
0
V Operating Junction Te p r t r R n e . . . . . . . . . . . . . . . . . . . . . - 5 ° t + 1 0 C
meaue ag
5C o 5°
Storage Te p r t r R n e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 6 ° t + 1 0 C
meaue ag
5C o 5°
Lead Te p r t r ( o d r n 1 s c n s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
meaue Sleig 0 eod)
.
300°C
T e m lR s s a c ,J n t o t C s : .............................. 4 2 C W
hra eitne ucin o ae
.°/
Mxmm Otu Cret . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
aiu upt urn:
1.5 A
Recommended Operating Conditions:
Output Votg Rne . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 t -
lae ag
-. o
37 VDC
Ambient Operating Temperature Range (T
A
) . . . . . . . . . . . . . . . . . . - 5° t +
5C o
125°C
Input Vo t g R n e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - . 5 t - 1 2
lae ag
42 o 4.5
3.3
33 - 1
.
COM137T
ELECTRICAL CHARACTERISTICS
Parameter
Reference Voltage
Symbol
V
REF
-55°C
T
A
125°C, I
L
= 8mA (unless otherwise specified)
Test Conditions
V
DIFF
Œ= 3 0 , T
A
= 25°C
.V
V
DIFF
Œ= 3.0V
V
DIFF
Œ= 40V, T
A
= 25°C
V
DIFF
Œ= 40V
Min.
-1.275
Max.
-1.225
-.0
12
-1.225
-.0
12
9
23
25
25
25
25
5
Unit
•
•
40V
-.0
13
-1.275
-.0
13
-
9
V
Line Regulation
(Note 1)
Load Regulation
(Note 1)
R
LINE
3.0 V
V
DIFF
Π40V, T
A
= 25°C
3.0 V
V
DIFF
Œ
R
LOAD
V
DIFF
Œ= 5.0V, 8mA
V
DIFF
Œ= 12V, 8mA
V
DIFF
Œ= 40V, 8mA
I
L
I
L
I
L
1.5A
•
•
-3
2
-5
2
-5
2
-5
2
mV
1.5A, T
A
= 25°C
200mA, T
A
= 25°C
I
L
100mA
mV
V
DIFF
Œ= 40V, 8mA
Thermal Regulation
V
RTH
•
-5
2
-
5
V
i
= - 4 6 , I
L
= 1.5A
1.V
n
P
d
= 20 Watts, t = 10 ms, T
A
= 25°C
mV
Ripple Rejection
(Note 2)
Adjustment Pin Current
R
N
f = 120 Hz, V
out
= V
rf
e
C
Adj
= 10 µF
•
•
•
•
•
•
•
•
•
66
dB
I
dj
A
V
DIFF
Œ= 3.0V
V
DIFF
Œ= 40V
100
100
-
5
-
5
5
5
30
.
30
.
50
.
15
.
0.24
35
.
12
.
A
mA
µA
µA
µA
Adjustment Pin
Current Change
Miminum Load Current
I
Adj
( i e
³ Ln)
I
Adj
(Load)
³
I
Lmin
3.0V
V
DIFF
Œ
40V
I
L
1.5A
V
DIFF
Œ= 5V, 8mA
V
DIFF
Œ= 3.0V, V
out
= - . V ( o c d
14 fre)
V
DIFF
Œ= 10V, V
out
= - . V ( o c d
14 fre)
14 fre)
V
DIFF
Œ= 40V, V
out
= - . V ( o c d
CretLm
u r n i it
(Note 2)
I
CL
V
DIFF
Œ
5V
V
DIFF
Œ= 40V, T
A
= 25°C
Notes:
1 Load and Line Regulation are specified at a constant junction temperature. Pulse testing with low duty cycle is used.
.
Changes in output voltage due to heating effects must be taken into account separately.
2 I nttse,salb gaate t teseiidlmt.
. f o etd hl e urned o h pcfe iis
3 The
•
denotes the specifications which apply over the full operating temperature range.
.
MECHANICAL OUTLINE
TO-257AA
3.3
.420
.410
.200
.190
.045
.035
.665
.645
.537
.527
.430
.410
.038 MAX.
PIN CONNECTION
.150
.140
Isolated
Pn1
i : Adjust
Pn2
i : Input
Pn3
i : Output
Tab:
Isolated
.750
.500
.005
1 2 3
.100 TYP.
.120 TYP.
.035
.025
205 Crawford Street, Leominster, MA 01453 USA (978) 534-5776 FAX (978) 537-4246
PCB设计
