description

The HR120 Series™ of DC/DC converters offers up to 12 watts of

power from single or dual outputs in a single package over a –40°C to

+85°C temperature range. Thick film hybrid manufacturing technology

produces high levels of miniaturization, giving the HR120 Series

converters a low profile (0.330 inch), small board area (1.65 square

inches), and high power density (22 watt/in3).

The parts are packaged in sealed steel enclosures, making them ideal

for use in high reliability applications. Each unit is guaranteed to pass

a hermeticity test with a maximum leak rate of 0.001 atm-cc/sec.

The HR120 converters are switching regulators which use a quasi-

square wave, single ended forward converter design with a nominal

switching frequency of 600 kHz. Isolation between input and output

circuits is provided with a transformer in the forward power loop and

a temperature insensitive optical link in the feedback control loop.

Output regulation is accomplished with constant frequency pulse width

modulation. Both line and load regulation are typically within 10 mV.

On dual output models, the positive output is independently regulated

and the negative output is cross-regulated. Figures 7 and 8 illustrate

what effects load changes have on the negative output.

Indefinite short circuit protection and overload protection are provided

by sensing output load current and restricting the output current to

approximately 125% of full load output current. Since the output

current is sensed in the secondary stage, the result is a predictable,

constant output current control with no foldback characteristics. HR120

converters are provided with internal filtering elements on both the

input and output to help reduce the need for external components.

The 5 and 12 volt output models provide full power operation over the

input voltage range of 16 to 40 volts (19 to 40 volts for 15 volt output

models). Operation below 16 volts (or below 19 volts for the 15 volt

output models), including operation in MIL-STD-704E emergency

power conditions, is possible with derated output power. Please refer

to the low voltage drop-out graphs, Figures 9 and 10.

The HR120 Series provides full power operation at case temperatures

from –40°C up to +85°C. Depending on operating levels, air flow, and

ambient temperature, heat sinking may be required.

An inhibit terminal is provided that can be used to disable internal

switching, resulting in a very low quiescent input current. An open

collector TTL compatible low (≤0.8 V) is required to control the inhibit

function. This level may be supplied by an open collector gate since

the inhibit pin is provided with an internal pull-up resistor.

MODELS

single

5

12

15

Dual

±12

±15

Features

• –40°C to +85°C operation

• 16 to 40 VDC input (19 to 40 VDC input for

15 volt output models)

• 50 V for up to 50 ms transient protection

• Fully isolated

• Fixed high frequency switching

• Inhibit function

• Indefinite short circuit protection

• Up to 83% efficiency

Size (max.): 1.460 x 1.130 x 0.330 inches (37.08 x 28.70 x 8.38 mm)

See case E1 for dimensions.

Weight:

21 grams typical.

Screening: Standard only. See “HR Industrial Non-QML Products

– Environmental Screening” table for screening description.

HR120

SERIES

12 WATT

not reCoMMenDeD For neW DesIGns

Crane Aerospace & Electronics

Electronics Group (Interpoint Brand)

PO Box 97005 • Redmond WA 98073-9705

425.882.3100 • power@crane-eg.com

www.interpoint.com

Page 1 of 6

HR120 Rev C - 20090904