SMSA SERIES
5 WATT
DC/DC CONVERTERS
ABSOLUTE MAXIMUM RATINGS
INHIBIT
TYPICAL CHARACTERISTICS
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
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
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
RECOMMENDED OPERATING CONDITIONS
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.
SINGLE OUTPUT MODELS
PARAMETER
SMSA283R3S
MIN TYP MAX
3.25 3.30 3.35
SMSA2805S
MIN TYP MAX
4.95 5.00 5.05
SMSA2812S
MIN TYP MAX
11.88 12.00 12.12
SMSA2815S
MIN TYP MAX
14.85 15.00 15.15
CONDITIONS
UNITS
VDC
OUTPUT VOLTAGE
OUTPUT CURRENT
Tc = –55°C TO +125°C
Tc = –55°C TO +125°C
V
= 16 TO 40 VDC
0
—
—
1200
4
0
—
—
1000
5
0
—
—
417
5
0
—
—
333
5
mA
W
IN
OUTPUT POWER
V
= 16 TO 40 VDC
IN
Tc = –55°C TO +125°C
10 kHz - 2 MHz
—
—
—
—
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
—
—
—
300 600
—
—
—
150 450
—
—
—
125 500
—
—
—
150 600
mV p-p
mV
V
= 16 TO 40 VDC
IN
Tc = –55°C TO +125°C
NO LOAD TO FULL
Tc = –55°C TO +125°C
Tc = –55°C TO +125°C
NO LOAD TO FULL
CONTINUOUS
10
10
50
50
10
10
50
50
10
10
50
50
10
10
50
50
LOAD REGULATION
INPUT VOLTAGE
mV
16
0
28
—
35
250
3
50
60
—
40
50
60
—
16
0
28
—
35
250
3
50
60
74
40
50
60
—
16
0
28
—
35
235
3
50
60
74
40
50
60
—
16
0
28
—
35
235
3
40
50
60
—
5
200
300
VDC
V
3
TRANSIENT 50 ms
INPUT CURRENT
NO LOAD
FULL LOAD
INHIBITED
—
—
—
—
—
60
—
—
—
—
—
68
—
—
—
—
—
69
—
—
—
—
—
%
mA
5
5
5
INPUT RIPPLE
CURRENT
EFFICIENCY
10 kHz - 10 MHz
Tc = –55°C TO +125°C
200
300
—
200
300
—
200
300
—
50
60
mA p-p
1, 2
LOAD FAULT
POWER DISSIPATION
RECOVERY
50% - 100% - 50%
TRANSIENT
—
—
1.5
12.5 25
2.4
—
—
1.5
12.5 25
2.0
—
—
1.2
1
1.9
10
—
—
1.2
1
1.8
10
W
ms
SHORT CIRCUIT
STEP LOAD
RESPONSE
—
—
200 500
200 500
—
—
200 500
200 500
—
—
300 750
400 1000
—
—
400 1000
400 1000
mV pk
µs
2, 3
RECOVERY
STEP LINE
RESPONSE
TRANSIENT
2, 3
16 TO 40 V
—
—
200 500
200 500
—
—
200 500
200 500
—
—
200 800
250 600
—
—
200 500
200 500
IN
mV pk
µs
40 TO 16 V
IN
RECOVERY
16 TO 40 V
IN
—
—
400 1000
400 1000
—
—
400 1000
400 1000
—
—
700 1300
700 1300
—
—
500 1300
500 1300
40 TO 16 V
IN
START-UP
DELAY
—
—
10
0
75
—
—
10
0
75
—
—
10
0
75
—
—
10
0
75
ms
3
OVERSHOOT
200
200
500
500
mV pk
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
3. Guaranteed but not tested.
V
is within 1% of V at final value.
OUT
OUT
2
CRANE [ Crane Aerospace & Electronics. ]
