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OM7612ST
1.5 AMP HIGH VOLTAGE NEGATIVE ADJUSTABLE REGULATOR
Three Terminal, High Voltage, Precision Adjustable Negative Voltage Regulator In Hermetic JEDEC TO-257AA Package
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 @ 25C
Power Dissipation (Pd) (Internally Limited). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 W Input - Output Voltage Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 V Operating Junction Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . - 55C to + 150C Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65C to + 150C Lead Temperature (Soldering 10 seconds). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300C Thermal Resistance: qJC (Isolated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2C/W qJC (Non-Isolated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5C/W qJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42C/W Maximum Output Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 A
3.3
4 11 R0
3.3 - 161
OM7612ST
ELECTRICAL CHARACTERISTICS
Parameter Reference Voltage Symbol VREF
-55C TA 125C, IL = 8mA (unless otherwise specified)
Min. -1.262 * -1.28 -1.28 * -1.28 -6 * -20 -25 -25 * -50 -5 Max. -1.238 -1.22 -1.22 -1.22 6 20 25 25 50 5 mV mV mV V Unit
Test Conditions VDIFF = 3.0V, TA = 25C VDIFF = 3.0V VDIFF = 50V, TA = 25C VDIFF = 50V
Line Regulation (Note 1) Load Regulation (Note 1)
RLINE
3.0 V VDIFF 50V, TA = 25C
RLOAD
VDIFF 50V, 8mA IL 110mA, TA = 25C VDIFF = 5V, 8mA IL 1.5A, TA = 25C
Thermal Regulation
VRTH
Vin = -14.6V, IL = 1.5A Pd = 20 Watts, t = 10 ms, TA = 25C
Ripple Rejection (Note 2) Adjustment Pin Current
RN
f = 120 Hz, VOUT = Vref CAdj = 10 F, IOUT = 100 mA
*
66
dB
IAdj
VDIFF = 3.0V VDIFF = 40V VDIFF = 50V
* * * * * * * * * * 1.5 0.2 -5 -6
100 100 100 5 6 3 3 5 5 3.5 1.0 A mA A A
Adjustment Pin Current Change Miminum Load Current
IAdj
VDIFF = 5V, 8mA IOUT 1.5A 3V VDIFF 50V, IL 8mA
ILmin
VDIFF = 3.0V, VOUT = -1.4V (forced) VDIFF = 10V, VOUT = -1.4V (forced) VDIFF = 40V, VOUT = -1.4V (forced) VDIFF = 50V, VOUT = -1.4V (forced)
Current Limit (Note 2)
ICL
VDIFF = 5V VDIFF = 50V, TA = 25C
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
3.3 - 162
OM7612ST
TYPICAL PERFORMANCE CHARACTERISTICS
LOAD REGULATION
0.2 0.2 4 4 0 0 -0.2 -0.2
CURRENT LIMIT
TJ = -55C TJ = -25C TJ = -150C 2
VO, Output Voltage Change (%)
IL = 0.5A IO, Output Current (A)
3 3
-0.4 -0.4 -0.6 -0.6 -0.8 -0.8 -1.0 -1.0
-1.2 -1.2 -1.4 -1.4 -50 -25 -75-50 -25 0 0 25 25 50 50 75 75 100 125 100 125 150 150
IL = 1.5A VI = -15V VO = -10V
1 1
0 0
0 0 10 10 20 20 30 30 40 40
TJ, Junction Temperature (C)
VI - VO, Input - Output Voltage Differential (Vdc)
ADJUSTMENT PIN CURRENT
80 80 IAdj, Adjustment Pin Current (A) 75 75 70 70 65 65 60 60 55 55 50 50
45 45 40 40 -50 -75 -50 -25 -25 0 0 25 25 50 50 75 100 125 150 75 100 125 150
DROPOUT VOLTAGE
VI - VO, Input - Output Voltage Differential (Vdc) 3.0 3.0 VO = -5V VO = 100mV 2.5 2.5 IL = 500mA IL = 1.5A
2.0 2.0 IL = 200mA
1.5 1.5
IL = 1.0A
IL = 20mA 1.0 1.0
-50 -50 -25 -25 0 0 25 25 50 50 75 100 125 150 75 100 125 150
TJ, Junction Temperature (C)
TJ, Junction Temperature (C)
TEMPERATURE STABILITY
1.270 IB, Quiescent Current (mA)
MINIMUM OPERATING CURRENT
1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 TJ = -55C TJ = 25C TJ = 150C
3.3
Vref, Reference Voltage (V)
1.260
1.250
1.240
1.230 -75 -50 -25 0 25 50 75 100 125 150
0 0 10 20 30 40 VI - VO, Input - Output Voltage Differential (Vdc)
TJ, Junction Temperature (C)
3.3 - 163
OM7612ST
TYPICAL APPLICATIONS
HIGH STABILITY REGULATOR DUAL TRACKING SUPPLY 1.25V TO 20V
+VIN 7V LM329B 1F Solid Tantalum Adj -VIN VIN VOUT OM7612ST
+
R2* 1F Solid Tantalum
+
OM7620ST VOUT VIN Adj 1F* R2 5K 1% R4 5k 1% R1** 100 1% R3 5K 2.2* F
+VOUT
R3 1.5K 1%
R1 1k 1%
D1 IN4002
+
10F
+
*R2 =
(VOUT) 9.08 x 10-3
-VOUT
10F
- 908
-VIN
1F* Adj VIN VOUT OM7612ST
R5** 100 1%
2.2* F
D2 IN4002 -VOUT
* Solid Tantalum ** R1 or R2 may be trimmed slightly to improve tracking.
IPROG + CIN* 1.0F R2 R1 120 CO** + 1.0F
* CIN is required if regulator is located more than 4 inches from power supply filter. A 1 F solid tantalum or 10 F aluminum electrolytic is recommended. ** CO is necessary for stability. A 1 F solid tantalum or 10 F aluminum electrolytic is recommended.
IAdj VIN -VIN OM7612ST VOUT -VOUT
VOUT = -1.25 V (1 +R2) R1
CONNECTION DIAGRAM
Tab
MECHANICAL OUTLINE
.420 .410 .200 .190 .045 .035 .665 .645 .537 .527 .430 .410 .038 MAX.
3.3
.150 .140
.750 .500
1 2 3
.005
Isolated
Front View Pin 1 - Adjust Pin 2 - Input Pin 3 - Output Tab - Isolated
Non-Isolated
Front View Pin 1 - Adjust Pin 2 - Input Pin 3 - Output Tab - Input
.035 .025 .100 TYP. .120 TYP.
NOTES * Case is metal/hermetically sealed * Isolated Tab
205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246

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