RECOMMENDED OPERATING CONDITIONS
TYPICAL CHARACTERISTICS
INHIBIT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
16 to 40 V
Output Power
5 watts
Lead Soldering Temperature (10 sec per lead)
300°C
Storage Temperature Range (Case)
–65°C to +135°C
2
SMSA SERIES
5 WATT
DC/DC CONVERTERS
Output Voltage Temperature Coefficient
100 ppm/°C typical
Input to Output Capacitance
50 pF typical
Isolation
100 megohm minimum at 500 V
Audio Rejection
50 dB typical
Conversion Frequency
550 kHz typical
450 kHz min, 600 kHz max
Inhibit Pin Voltage (unit enabled)
9 to 11 V
Input Voltage Range
16 to 40 VDC continuous
50 V for up to 50 msec transient
Case Operating Temperature (Tc)
–55°C to +125°C full power
–55°C to +135°C absolute
Derating Output Power/Current (Tc)
Linearly from 100% at 125°C to 0% at 135°C
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified.
Inhibit TTL Open Collector
Logic low (output disabled)
Logic low voltage
≤0.8 V max
Inhibit pin current 4 mA max
Referenced to input common
Logic high (output enabled)
Open collector
Notes
1. Indefinite short circuit protection not guaranteed above 125°C (case).
2. Recovery time is measured from application of the transient to point at which
VOUT is within 1% of VOUT at final value.
3. Guaranteed but not tested.
SINGLE OUTPUT MODELS
SMSA283R3S
SMSA2805S
SMSA2812S
SMSA2815S
PARAMETER
CONDITIONS
MIN
TYP MAX
MIN
TYP MAX
MIN
TYP MAX
MIN
TYP MAX
UNITS
OUTPUT VOLTAGE
Tc = –55°C TO +125°C
3.25
3.30
3.35
4.95
5.00
5.05
11.88 12.00 12.12
14.85 15.00 15.15
VDC
OUTPUT CURRENT
Tc = –55°C TO +125°C
VIN = 16 TO 40 VDC
0
—
1200
0
—
1000
0
—
417
0
—
333
mA
OUTPUT POWER
VIN = 16 TO 40 VDC
Tc = –55°C TO +125°C
—
4
—
5
—
5
—
5
W
OUTPUT RIPPLE
VOLTAGE
10 kHz - 2 MHz
—
300
600
—
150
450
—
125
500
—
150
600
mV p-p
LINE REGULATION
VIN = 16 TO 40 VDC
Tc = –55°C TO +125°C
—
10
50
—
10
50
—
10
50
—
10
50
mV
LOAD REGULATION
NO LOAD TO FULL
Tc = –55°C TO +125°C
—
10
50
—
10
50
—
10
50
—
10
50
mV
INPUT VOLTAGE
Tc = –55°C TO +125°C
NO LOAD TO FULL
CONTINUOUS
16
28
40
16
28
40
16
28
40
16
28
40
VDC
TRANSIENT3 50 ms
0
—
50
0
—
50
0
—
50
0
—
50
V
INPUT CURRENT
NO LOAD
—
35
60
—
35
60
—
35
60
—
35
60
FULL LOAD
—
250
—
250
—
235
—
235
—
mA
INHIBITED
—
3
5
—
3
5
—
3
5
—
3
5
INPUT RIPPLE
10 kHz - 10 MHz
—
50
200
—
50
200
—
50
200
—
50
200
mA p-p
CURRENT
Tc = –55°C TO +125°C
—
60
300
—
60
300
—
60
300
—
60
300
EFFICIENCY
60
—
68
74
—
69
74
—
%
LOAD FAULT1, 2
POWER DISSIPATION
—
1.5
2.4
—
1.5
2.0
—
1.2
1.9
—
1.2
1.8
W
SHORT CIRCUIT
RECOVERY
—
12.5
25
—
12.5
25
—
1
10
—
1
10
ms
STEP LOAD
50% - 100% - 50%
RESPONSE
TRANSIENT
—
200
500
—
200
500
—
300
750
—
400
1000
mV pk
RECOVERY 2, 3
—
200
500
—
200
500
—
400
1000
—
400
1000
s
STEP LINE
TRANSIENT
RESPONSE2, 3
16 TO 40 VIN
—
200
500
—
200
500
—
200
800
—
200
500
mV pk
40 TO 16 VIN
—
200
500
—
200
500
—
250
600
—
200
500
RECOVERY
16 TO 40 VIN
—
400
1000
—
400
1000
—
700
1300
—
500
1300
s
40 TO 16 VIN
—
400
1000
—
400
1000
—
700
1300
—
500
1300
START-UP
DELAY
—
10
75
—
10
75
—
10
75
—
10
75
ms
OVERSHOOT3
—
0
200
—
0
200
—
0
500
—
0
500
mV pk