3.3 - 161
3.3
OM7612ST
Three Terminal, High Voltage, Precision
Adjustable Negative Voltage Regulator In
Hermetic JEDEC TO-257AA Package
4 11 R0
1.5 AMP HIGH VOLTAGE NEGATIVE
ADJUSTABLE REGULATOR
FEATURES
· Similar To Industry Standard LT137AHV
· Adjustable Output Voltage
· Built In Thermal Overload Protection
· Short Circuit Current Limiting
· Available In Isolated and Non-Isolated Package
· Maximum Output Voltage Tolerance Is Guaranteed To ±1%
· Available Hi-Rel Screened
DESCRIPTION
This three terminal negative regulator is supplied in a hermetically sealed metal
package whose outline is similar to the industry standard TO-220 plastic package. 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 -47 volts.
ABSOLUTE MAXIMUM RATINGS
@ 25°C
Power Dissipation (Pd) (Internally Limited). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 W
Input - Output Voltage Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 V
Operating Junction Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . - 55°C to + 150°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65°C to + 150°C
Lead Temperature (Soldering 10 seconds). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C
Thermal Resistance:
q
JC
(Isolated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2°C/W
q
JC
(Non-Isolated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5°C/W
q
JA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42°C/W
Maximum Output Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 A
3.3 - 162
3.3
OM7612ST
ELECTRICAL CHARACTERISTICS
-55°C T
A
125°C, I
L
= 8mA (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min.
Max.
Unit
Reference Voltage
V
REF
V
DIFF
= 3.0V, T
A
= 25°C
-1.262
-1.238
V
DIFF
= 3.0V
·
-1.28
-1.22
V
V
DIFF
= 50V, T
A
= 25°C
-1.28
-1.22
V
DIFF
= 50V
·
-1.28
-1.22
Line Regulation
R
LINE
3.0 V V
DIFF
50V, T
A
= 25°C
-6
6
(Note 1)
·
-20
20
mV
Load Regulation
R
LOAD
V
DIFF
50V, 8mA I
L
110mA, T
A
= 25°C
-25
25
(Note 1)
V
DIFF
= 5V, 8mA I
L
1.5A, T
A
= 25°C
-25
25
mV
·
-50
50
Thermal Regulation
V
RTH
V
in
= -14.6V, I
L
= 1.5A
-5
5
mV
P
d
= 20 Watts, t = 10 ms, T
A
= 25°C
Ripple Rejection
R
N
f = 120 Hz, V
OUT
= V
ref
·
66
dB
(Note 2)
C
Adj
= 10 µF, I
OUT
= 100 mA
Adjustment Pin Current
I
Adj
V
DIFF
= 3.0V
·
100
V
DIFF
= 40V
·
100
µA
V
DIFF
= 50V
·
100
Adjustment Pin
³I
Adj
V
DIFF
= 5V, 8mA I
OUT
1.5A
·
-5
5
µA
Current Change
3V V
DIFF
50V, I
L
8mA
·
-6
6
Miminum Load Current
I
Lmin
V
DIFF
= 3.0V, V
OUT
= -1.4V (forced)
·
3
V
DIFF
= 10V, V
OUT
= -1.4V (forced)
·
3
mA
V
DIFF
= 40V, V
OUT
= -1.4V (forced)
·
5
V
DIFF
= 50V, V
OUT
= -1.4V (forced)
·
5
Current Limit
I
CL
V
DIFF
= 5V
·
1.5
3.5
(Note 2)
V
DIFF
= 50V, T
A
= 25°C
0.2
1.0
A
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. If not tested, shall be guaranteed to the specified limits.
3. The
·
denotes the specifications which apply over the full operating temperature range.
3.3 - 163
3.3
OM7612ST
TYPICAL PERFORMANCE CHARACTERISTICS
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-50
-25
0
25
50
75
100
125
150
4
3
2
1
0
0
10
20
30
40
80
75
70
65
60
55
50
45
40
-50
-25
0
25
50
75
100
125
150
3.0
2.5
2.0
1.5
1.0
-50
-25
0
25
50
75
100
125
150
LOAD REGULATION
T
J
, Junction Temperature (C°)
I
L
= 0.5A
I
L
= 1.5A
V
I
= -15V
V
O
= -10V
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-75
-50
-25
0
25
50
75
100 125
150
ADJUSTMENT PIN CURRENT
T
J
, Junction Temperature (C°)
80
75
70
65
60
55
50
45
40
-75
-50
-25
0
25
50
75
100 125 150
TEMPERATURE STABILITY
T
J
, Junction Temperature (C°)
1.270
1.260
1.250
1.240
1.230
-75
-50
-25
0
25
50
75
100 125 150
CURRENT LIMIT
V
I
- V
O
, Input - Output Voltage Differential (V
dc
)
T
J
= -25°C
T
J
= -55°C
T
J
= -150°C
4
3
2
1
0
0
10
20
30
40
DROPOUT VOLTAGE
T
J
, Junction Temperature (C°)
I
L
= 1.5A
V
O
= -5V ³V
O
= 100mV
I
L
= 20mA
I
L
= 1.0A
I
L
= 500mA
I
L
= 200mA
3.0
2.5
2.0
1.5
1.0
-50
-25
0
25
50
75
100
125 150
MINIMUM OPERATING CURRENT
T
J
= 25°C
T
J
= -55°C
T
J
= 150°C
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
10
20
30
40
V
I
- V
O
, Input - Output Voltage Differential (V
dc
)
V
ref
, Reference Voltage (V)
³V
O
, Output Voltage Change (%)
I
O
, Output Current (A)
I
Adj
, Adjustment Pin Current (µA)
V
I
- V
O
, Input - Output Voltage Differential (V
dc
)
I
B
, Quiescent Current (mA)
3.3
205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246
OM7612ST
TYPICAL APPLICATIONS
1
2
3
Tab
CONNECTION DIAGRAM
* CIN is required if regulator is located more than
4 inches from power supply filter. A 1 µF solid
tantalum or 10 µF aluminum electrolytic is
recommended.
** CO is necessary for stability. A 1 µF solid
tantalum or 10 µF aluminum electrolytic is
recommended.
VOUT = -1.25 V (1 +R2)
R1
Isolated
Non-Isolated
Front View
Front View
Pin 1 - Adjust
Pin 1 - Adjust
Pin 2 - Input
Pin 2 - Input
Pin 3 - Output
Pin 3 - Output
Tab
- Isolated
Tab
- Input
HIGH STABILITY REGULATOR
Adj
V
IN
V
OUT
OM7612ST
+
1µF
Solid
Tantalum
R
3
1.5K
1%
+
1µF
Solid
Tantalum
7V
LM329B
R
2
*
R
1
1k
1%
-V
OUT
-V
IN
(V
OUT
)
9.08 x 10
-3
*R2 =
- 908
OM7612ST
1.0µF
1.0µF
-V
IN
-V
OUT
V
OUT
V
IN
I
Adj
I
PROG
C
IN
*
C
O
**
R
2
R
1
120
+
+
.430
.410
.200
.190
.038 MAX.
.005
.120 TYP.
.537
.527
.665
.645
.420
.410
.150
.140
.750
.500
.100 TYP.
.035
.025
.045
.035
MECHANICAL OUTLINE
NOTES
· Case is metal/hermetically sealed
· Isolated Tab
DUAL TRACKING SUPPLY ±1.25V TO ±20V
D1
IN4002
OM7620ST
V
IN
V
OUT
Adj
Adj
V
IN
V
OUT
OM7612ST
+V
IN
+V
OUT
-V
IN
-V
OUT
R2
5K
1%
R4
5k
1%
R1**
100
1%
2.2*
µF
1µF*
D2
IN4002
1µF*
10µF
10µF
*
Solid Tantalum
** R1 or R2 may be trimmed slightly to improve tracking.
R3
5K
R5**
100
1%
+
+
2.2*
µF
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