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OM7620ST
1.5 AMP HIGH VOLTAGE POSITIVE ADJUSTABLE REGULATOR
Three Terminal, High Voltage, Precision Adjustable Positive Voltage Regulator In Hermetic JEDEC TO-257AA
FEATURES
* * * * * * * Similar To Industry Standard LT117AHV 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 positive 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 57 volts using external resistors.
ABSOLUTE MAXIMUM RATINGS @ 25C
Power Dissipation (Pd) (Internally Limited) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 W Input - Output Voltage Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 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 - 169
OM7620ST
ELECTRICAL CHARACTERISTICS
Parameter Reference Voltage Symbol VREF
-55C TA 125C, IL = 8mA (unless otherwise specified)
Min. 1.238 Max. 1.262 1.270 1.270 1.270 4.5 9 5 10 15 15 15 15 15 5 mV mV mV V Unit
Test Conditions VDIFF = 3.0V, TA = 25C VDIFF = 3.3V VDIFF = 40V VDIFF = 60V
* * * * * * * *
1.225 1.225 1.225 -4.5 -9 -5 -10 -15 -15 -15 -15 -15 -5
Line Regulation (Note 1)
RLINE
3.0V VDIFF 40V, VOUT = Vref, TA = 25C 3.3V VDIFF 40V, VOUT = Vref 40V VDIFF 60V, VOUT = Vref, TA = 25C 40V VDIFF 60V, VOUT = Vref
Load Regulation (Note 1)
RLOAD
VDIFF = 3.0V, 10mA IL 1.5A, TA = 25C VDIFF = 3.3V, 10mA IL 1.5A VDIFF = 40V, 10mA IL 300mA, TA = 25C VDIFF = 40V, 10mA IL 195mA VDIFF = 60V, 10mA IL 30mA
Thermal Regulation
VRTH
VIN = 14.6V, IL = 1.5A Pd = 20 Watts, t = 20 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, TA = 25C VDIFF = 3.3V VDIFF = 40V VDIFF = 60V
100
* * *
-5
100 100 100 5 5 5 5 5 5 5 5
A
Adjustment Pin Current Change
IAdj
VDIFF = 3.0V, 10mA IL 1.5A, TA = 25C VDIFF = 3.3V, 10mA IL 1.5A VDIFF = 40V, 10mA IL 300mA, TA = 25C VDIFF = 40V, 10mA IL 195mA 3.0V VDIFF 40V, TA = 25C 3.3V VDIFF 40V 3.3V VDIFF 60V
* * * * * * * *
-5 -5 -5 -5 -5 -5
A
Miminum Load Current
ILmin
VDIFF = 3.0V, VOUT = 1.4V (forced), TA = 25C VDIFF = 3.3V, VOUT = 1.4V (forced)
5 5 7 1.5 0.3 0.05 3.5 1.5 0.50
mA
3.3
Current Limit (Note 2) ICL
VDIFF = 40V, VOUT = 1.4V (forced) VDIFF = 60V, VOUT = 1.4V (forced) VDIFF = 5V VDIFF = 40V, TA = 25C VDIFF = 60V, TA = 25C
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 - 170
OM7620ST
TYPICAL APPLICATIONS
LOAD REGULATION
4 VO, Output Voltage Change (%)
0.4 0.4
CURRENT LIMIT
IO, Output Current (A)
0.2 0.2
3 TJ = 25C 2 TJ = 55C 1 TJ = 150C
0 0 -0.2 -0.2 -0.4 -0.4 -0.6 -0.6 -0.8 -0.8 -1.0 -1.0
-75 -75 -50 -25 -50 -25 0 0 25 25 50 50
IL = 0.5A
IL = 1.5A VI = 15V VO = 10V
100 125 150 75 75 100 125 150
0 0 10 20 30 40 TJ, Junction Temperature (C) VI - VO, Input - Output Voltage Differential (Vdc)
VI - VO, Input - Output Voltage Differential (Vdc)
ADJUSTMENT PIN CURRENT
IAdj, Adjustment Pin Current (A)
70 70 65 65 60 60 55 55 50 50 45 45 40 40 35 35 -75 -50 -25 -75 -50 -25
DROPOUT VOLTAGE
3.0 3.0
VO = 100mV
2.5 2.5
IL = 1.5A IL = 1.0A IL = 500mA
2.0 2.0
1.5 1.5 IL = 20mA IL = 200mA 1.0 1.0 -75 -50 -25 00 25 50 75 100 125 150 -75 -50 -25 100 125 150 25 50 75 TJ, Junction Temperature (C)
0 0
25 25
50 50
75 100 125 150 100 125 150 75
TJ, Junction Temperature (C)
TEMPERATURE STABILITY
1.260 1.260
MINIMUM OPERATING CURRENT
5.0 5.0 4.5 4.5 4.0 4.0 3.5 3.5 3.0 3.0 2.5 2.5 2.0 2.0 1.5 1.5 1.0 1.0 0.5 0.5 0 0 0 0
TJ = 55C
Vref, Reference Voltage (V)
1.250 1.250
IB, Quiescent Current (mA)
TJ = 25C TJ = 150C
1.240 1.240
1.230 1.230
1.220 1.220 -75 -50 -25 -75 -50 -25
0 0
25 25
100 125 150 75 50 50 75 100 125 150
10 10
20 20
30 30
40 40
TJ, Junction Temperature (C)
VI - VO, Input - Output Voltage Differential (Vdc)
3.3
STANDARD APPLICATION
VIN VOUT OM7620ST R1 240 IAdj CIN* 0.1 F R2 Adjust Co** 1.0 F
* CIN is required if regulator is located an appreciable distance from power supply filter. ** Co is not needed for stability, however it does improve transient response. VOUT = 1.25 V (1 + R2 )+ IAdj R2 R1 Since IAdj is controlled to less than 100 A, the error associated with this term is negligible in most applications.
3.3 - 171
OM7620ST
TYPICAL APPLICATIONS
ADJUSTABLE CURRENT LIMITER
+25V
OM7620ST
5 V ELECTRONIC SHUT DOWN REGULATOR
IO 1N4002 VIN OM7620ST VOUT 120 1.0F D1
VOUT R1 1.25 Adjust R2 100
VO
VIN
VIN Adjust
* To provide current limiting of IO to the system ground, the source of the FET must be tied to a negative voltage below -1.25 V.
MPS2222 720 2N5640 1K TTL Control
R2
VREF IDSS
R1 =
VREF IOmax + IDSS
VO < BVDSS + 1.25 V + VSS ILmin - IDSS < IO < 1.5 A As shown 0 < IO < 1 A
Minimum VOUT = 1.25 V
Vss*
D1 protects the device during an input short circuit.
SLOW TURN-ON CURRENT
CURRENT REGULATOR
VIN
OM7620ST
VOUT 240
VIN
OM7620ST IN4001
VOUT
R1
IOUT
Adjust R2
MPS2907
Adjust 50 K
IAdj
+
10 F
(V ) + IAdj 1.25 V IOUT = REF @ R1 R1 10mA IOUT 1.5 A
MECHANICAL OUTLINE
.420 .410 .200 .190 .045 .035 .665 .645 .537 .527 .430 .410 .038 MAX.
CONNECTION DIAGRAM
Tab
.150 .140
3.3
.750 .500
.005
.035 .025
.100 TYP.
.120 TYP.
1
2
3
Isolated
Front View Pin 1 - Adjust Pin 2 - Output Pin 3 - Input Tab - Isolated
Non-Isolated
Front View Pin 1 - Adjust Pin 2 - Output Pin 3 - Input Tab - Output
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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