SMHF Datasheet, PDF (2/12 Pages) List of Unclassifed Manufacturers – DC/DC CONVERTERS 28 VOLT INPUT

SMHF SERIES _{DC/DC CONVERTERS}
SINGLE AND DUAL
15 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 16 to 40 VDC
Power Dissipation (Pd)
• 8W
Output Power
• 12 to 15 watts depending on model
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +150°C
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 40 VDC continuous
• 0 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
SYNC AND INHIBIT
Sync In (500 to 600 kHz)
• Duty cycle 40% to 60%
• 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)
Logic low voltage ≤0.8 V max
Inhibit pin current 4.0 mA max
• Referenced to input common
• Logic high (output enabled)
Open collector or unconnected
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 100 ppm /°C typical
• 150 ppm/°C maximum
Input to Output Capacitance
• 60 pF typical
Undervoltage Lockout
• 12 V input typical
Current Limit
• 115% of full load typical
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 50 dB typical
Conversion Frequency (º55°C to +125°C Tc)
• Free run 550 kHz typical
480 kHz min, 620 kHz max
Inhibit Pin Voltage (unit enabled)
• 8.5 to 12 V
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified.
SINGLE OUTPUT MODELS
OUTPUT VOLTAGE
Tc = 25°C
OUTPUT CURRENT
V_IN = 16 TO 40 VDC
OUTPUT POWER
V_IN = 16 TO 40 VDC
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
10 kHz - 2 MHz
Tc = –55°C TO +125°C
V_IN = 16 TO 40 VDC
LOAD REGULATION
INPUT VOLTAGE
NO LOAD TO FULL
CONTINUOUS
NO LOAD TO FULL
TRANSIENT 120 ms
INPUT CURRENT
NO LOAD
FULL LOAD
INPUT RIPPLE
CURRENT
INHIBITED
10k Hz - 10 MHz
Tc = –55°C TO +125°C
EFFICIENCY
LOAD FAULT¹
Tc = 25°C
SHORT CIRCUIT
STEP LOAD
RESPONSE
STEP LINE
RESPONSE
START-UP
0 TO 28 VIN
POWER DISSIPATION
RECOVERY²
50 %–100%– 50%
TRANSIENT
RECOVERY²
16 TTORA4N0STIOEN1T6₃V_IN
RECOVERY²
DELAY
OVERSHOOT⁴
SMHF283R3S
SMHF2805S
SMHF2812S
SMHF2815S
3.27 3.3 3.33 4.95 5 5.05 11.88 12 12.12 14.85 15 15.15
— — 2.4 — — 2.4 — — 1.25 — — 1.00
0 — 8 0 — 12 0 — 15 0 — 15
— 60 160 — 30 80 — 60 160 — 60 75
— 80 240 — 150 240 — 50 120 — 100 260
— 5 100 — 5 100 — 5 100 — 5 100
— 20 50 — 20 50 — 20 50 — 20 50
16 28 40 16 28 40 16 28 40 16 28 40
0 — 50 0 — 50 0 — 50 0 — 50
— 25 65 — 25 40 — 25 50 — 25 62
— — 397 — 560 624 — 680 752 — 670 752
— 5 12 — 5 12 — 5 12 — 5 12
— 45 80 — 35 80 — 35 80 — 35 80
— — 120 — — 120 — — 120 — — 120
70 73 — 73 75 — 78 79 — 74 80 —
— 5 8 — 3.5 8 — 3.5 8 — 3.5 7
— 7.5 30 — 7.5 30 — 7.5 30 — 7.5 30
–400 150 500 –500 150 500 –700 150 700 –800 200 800
— 150 300 — 150 300 — 150 500 — 600 1200
–800 550
— 0.8
— 10
— 200
800 –800 550
1.2 — 0.8
25 — 10
300 — 100
800 –800 550
1.2 — 0.8
25 — 10
600 — 200
800 –800 550 800
1.2 — 0.8 1.2
25 — 10 25
1200 — 200 1500
VDC
A
W
mV p-p
mV
mV
VDC
V
mA
mA p-p
%
W
ms
mV pk
µs
mV pk
µs
µs
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 the point at which Vout is within regulation.
3. Input step transition time >10µs.
4. Input step transition time <100µs.
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