75 Watt, High Density, Eighth Brick DC/DC Converter

WWW.ASTRODYNETDI.COM

ASTRODYNE USA: 1-800-823-8082

ASTRODYNE PACIFIC: 886-2-26983458

ABSOLUTE MAXIMUM RATINGS (MIN TO MAX.)

Input Voltage (+In to -In)

24Vin: 18-36VDC Continuous

48Vin: 36-75VDC Continuous

Transient Input Voltage

24Vin: 50VDC (100mS max.)

48Vin: 100VDC (100mS max.)

Operating Temperature

-40 to 85°C (See Derate Curve)

Storage Temperature (Ambient) 125°C

Wave Solder Temperature

260°C for 10 Seconds

INPUT SPECIFICATIONS (400LFM AIRFLOW)

Input Operation Voltage:

See Model Chart on Page 1

Input Current FL (0 Vin - Vin max.)See Model Chart on Page 1

Input Transient

1A²t

Input Reflected Ripple Current

20mAp-p, typ. (Note 1)

Startup Input Voltage (Note 4)

24Vin: 16-18VDC

48Vin: 33-36VDC

Shutoff Input Voltage

24Vin: 14-16VDC

48Vin: 30-33VDC

Hysteresis

1V

OUTPUT SPECIFICATIONS

Output Voltage

See Model Chart on Page 1

Output Current (Io, max.)

See Model Chart on Page 1

Output Set Point (Vo,set)

+/-1.5%, Nominal Vin, FL

Total Output Voltage Range

+/- 3%

Line/Load Regulation

+/-1%

Temperature Regulation

+/-1%, -40 to 70°C

Ripple/Noise

150mV p-p max., 30mVrms (Note 2)

Dynamic Response:

(Note 3)

Peak Deviation

4% Vnom

Settling Time

200uS Vout within 1% Vnom

Over Voltage Protection

110-140% of Output, Hiccup Mode

Over Temperature Protection

105-125°C, auto recover

(converter hot spot temperature)

External Capacitance (Electrolytic)3.3 & 5Vout: 10 to 5000uF max.

12Vout: 220 to 1200uF max.

Short Circuit Protection (rms)

15Arms, Hiccup, Rout ≤10M Ω

Current Limit (rms.)

105-140%, Hiccup Mode

Efficiency FL

See Model Chart on Page 1

ISOLATION SPECIFICATIONS

Input-Output

1500VDC

Input-Output Capacitance

1500pF

Isolation Resistance

10MΩ

GENERAL SPECIFICATIONS

MTBF

1.3Mhrs

Weight

0.72 oz (20.5g)

Dimensions

2.3” x 1.45” x 0.47”

(58.4 x 36.8 x 12mm)

CONTROL SPECIFICATIONS

Input Logic Low

Voltage at 1mA current relative to

-Vin is 1V max.

Current at 0 volts is 1mA

Input Logic High

Enable pin voltage relative to -Vin

is 5.5V

Leakage current is 100uA

Turn-On Time

500mS, FL, o=90% Vo, set

Trim Adjustment Range

80-110% See TRIM FUNCTION

Fig 4

NOTES

1.Measured before Input Filter, 12uH inductor

2.Scope measurement should be made using a BNC connector with 1uF

and 10uF aluminum electrolytic capacitor across output. Scope set to

read at 20MHz bandwidth.

3. 25%-50%-75% load, 0.1A/

uS

4. The Cold Start condition is a uniform converter temperature of -40°C

after thermal stabilization. An additional 2x220uF is needed for cold

startup conditions. The Hot Start condition for start up is a uniform con-

verter temperature of 65°C after thermal stabilization.

All specifications are typical at nominal input, full load, and 25DegC unless

otherwise noted