SMTR SERIES
30 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 16 to 40 VDC
Output Power
• 25 to 30 watts depending on model
Lead Soldering Temperature (10 sec per pin)
• 300°C
Storage Temperature Range (Case)
• –65°C to +135°C
DC/DC C
ONVERTERS
SYNC AND INHIBIT
Sync (500 to 675 kHz)
• Duty cycle 40% min, 60% max
• Logic low 0.8 V max
• Logic high 4.5 V min, 5 V max
• Referenced to input common
• If not used, connect to input common
Inhibit TTL Open Collector
• Logic low (output disabled)
Voltage
≤0.8
V
Inhibit pin current 8.0 mA max
• Referenced to input common
• Logic high (output enabled)
Open collector
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 100 ppm/°C typical single and dual outputs
• 200 ppm/°C main, 300 ppm/°C aux
triple output
Input to Output Capacitance
• 50 pF typ (100 pF typ triple outputs)
Current Limit
• 115% of full load typical
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 40 dB typ (50 dB typ triple output)l
Conversion Frequency
• Free run 550 min, 600 typ, 650 max kHz
• External sync 500 to 675 kHz
Inhibit Pin Voltage (unit enabled)
• 9 to 11 V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 40 VDC continuous
• 50 V for 50 msec transient
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +135°C absolute
Derating Output Power/Current
• 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
OUTPUT VOLTAGE
OUTPUT CURRENT
1
OUTPUT POWER
1
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
2
LOAD REGULATION
INPUT VOLTAGE
1
NO LOAD TO FULL
INPUT CURRENT
1
CONDITION
V
IN
= 16 to 40 VDC
V
IN
= 16 to 40 VDC
10 kHz – 2 MHz
Tc = –55°C TO +125°C
Vin = 16 to 40 VDC
Tc = –55°C TO +125°C
NO LOAD TO FULL
Tc = –55°C TO +125°C
CONTINUOUS
TRANSIENT 50 ms
NO LOAD
FULL LOAD
INHIBITED
10 kHz – 10 MHz
Tc = –55°C TO +125°C
SHORT CIRCUIT
POWER DISSIPATION
RECOVERY
1, 5
50% – 100% – 50%
TRANSIENT
RECOVERY
5
16 – 40 – 16 VDC
TRANSIENT
6
RECOVERY
5
DELAY
OVERSHOOT
FULL LOAD
NO LOAD
SMTR283R3S
MIN
3.27
0
0
—
—
—
—
16
—
—
—
—
—
74
—
—
—
—
—
—
—
—
—
TYP
3.30
––
—
15
—
—
—
28
—
30
0.94
7
25
76
—
1.4
MAX
3.33
5.45
18
40
50
20
20
40
50
75
—
8
50
—
10
6
SMTR2805S
MIN
4.95
0
0
—
—
—
—
16
—
—
—
—
—
74
—
—
—
—
—
—
—
—
—
TYP
5.00
—
—
35
50
15
15
28
—
35
1.15
3
20
78
—
1.4
SMTR2812S
SMTR2815S
UNITS
VDC
A
W
mV p-p
MAX MIN TYP MAX MIN TYP MAX
5.05 11.88 12.00 12.12 14.85 15.00 15.15
5.0
0
—
2.5
0
—
2.0
25
40
90
50
50
40
50
75
—
8
50
—
10
5
0
—
—
—
—
16
—
—
—
—
—
78
—
—
—
—
—
—
—
—
—
—
25
40
15
15
28
—
35
1.30
3
20
83
—
1.4
30
40
90
50
50
40
50
75
—
8
50
—
10
5
0
—
—
—
—
16
—
—
—
—
—
79
—
—
—
—
—
—
—
—
—
—
25
40
15
15
28
—
35
1.25
3
20
84
—
1.4
30
40
90
50
50
40
50
75
—
8
50
—
10
5
mV
mV
VDC
V
mA
A
mA
mA p-p
%
W
ms
mV pk
µs
mV pk
µs
ms
INPUT RIPPLE
CURRENT
3
EFFICIENCY
LOAD FAULT
4
STEP LOAD RESP.
±125 ±250
—
200
—
—
1.4
0
33
±300
300
5
50
150
±200 ±300
60
200
±200 ±300
—
300
1.4
0
50
5
50
250
±250 ±400
60
200
±400 ±500
—
300
1.4
0
120
5
120
600
±350 ±500
60
200
±500 ±600
—
300
1.4
0
150
5
150
750
STEP LINE RESP.
START-UP
1
mV pk
Notes
1. Tc = –55°C to +125°C
2. Operation is limited below 16V (see Figure 21).
3. Tested with 3300 pF ceramic bypass capacitors connected externally from
input common to case and output common to case.
4. Indefinite short circuit protection not guaranteed above 125°C case.
5. Recovery time is measured from application of the transient to point at which
Vout is within 1% of final value.
6. Transition time
≥10
µs.
®
2
INTERPOINT [ INTERPOINT CORPORATION COMPANY ]
