B4-51

EATURES

· 40°C to +85°C operation
· 16 to 32 VDC input voltage
· Fully isolated
· Opto-coupler feedback
· Switching frequency

Single and dual outputs

typical 80 kHz, variable freq.

Triple output 200 kHz, fixed

· Topology Flyback
· Inhibit function
· Indefinite short circuit protection
· Up to 75% efficiency
· Requires external capacitors

DESCRIPTION

The HR40 SeriesTM DC/DC converters offer the high efficiencies
associated with switching regulators, yet have full isolation of input
and output grounds. The units are built using thick-film hybrid tech-
nology and are sealed in metal packages for high-reliability applica-
tions. All models are guaranteed to pass a gross leak test (maximum
leak rate of 1 x 10

-3

atm-cc/sec).

The HR40 Series devices are flyback energy storage switching
regulators which require a minimum of components resulting in
small package size. Single and dual models self-oscillate at an
operating frequency which is an approximate inverse function of the
load. At full load, the frequency is typically 80 kHz for single and dual
output models. Triple output models operate at a fixed frequency of
approximately 200 kHz. A transformer in the forward power circuit
and an opto-coupler in the feedback/control loop maintain input to
output isolation.

Models are available with single 5 volt, dual 12 or 15 volt, or triple
(+5 and either ±12 or ±15) outputs with an input voltage range of 16
to 32 VDC. Output power of up to 4 watts is available from the dual
output models for either balanced or unbalanced loads; however, at
least 25% of the total load should be on the positive output. The
single output device can provide 3.5 watts, and the triple output can
supply up to 3.2 watts. The high efficiency is almost constant over
the entire input voltage range and from approximately 25% of full
load to full load. This makes the unit ideal for battery applications.

An open collector TTL inhibit is provided to allow power shutdown
and startup from a logic input. An open circuit on the inhibit terminal
(pin 15) gives normal operation, and a TTL low level shuts down the
converter. The inhibit pin has an open circuit voltage of 12 to 28 V.
Input current in the shutdown mode will be less than 15 mA. Current
limiting is provided on each output for indefinite short circuit protec-
tion.

Due to the high efficiency, heat sinking requirements are minimized,
but consideration should be given to removing self-generated heat
when operating these devices at maximum ratings. To increase
dissipation, heat conducting material (PCB, copper sheet, heat sink,
etc.) should be brought into contact with the converter's baseplate.
The converter can be operated at full load at a case temperature of
85°C, with the output power derated linearly to zero at 105°C.

ARNING

: E

XTERNAL

APACITORS

EQUIRED

External capacitors are required on the outputs. Operating the unit
without external capacitors will result in damage to the internal
circuitry. Minimum recommended capacitor values are given in
Tables 1 and 2. For optimum performance, low ESR (Equivalent
Series Resistance) solid tantalum capacitors are required. The
specifications on the following pages are based on the use of high-
quality solid tantalums. Operation with different types of capacitors
will seriously affect performance.

DC/DC C

ONVERTERS

28 V

OLT

NPUT

HR40 SERIES

4 WATT

Size (max.): 1.075 x 1.075 x 0.370 inches (27.31 x 27.31 x 9.40 mm)

See Section B8, case C2, for dimensions.

Weight:

20 grams maximum

Screening: Standard only. See Section C2 for screening description.

MODELS

VDC O

UTPUT

SINGLE

DUAL

±12
±15

TRIPLE

+5 & ±12
+5 & ±15

SINGLE AND DUAL OUTPUT EXTERNAL CAPACITORS

PERATION WITHOUT EXTERNAL CAPACITORS WILL RESULT IN DAMAGE TO THE INTERNAL CIRCUITRY

TYPICAL CHARACTERISTICS

RECOMMENDED OPERATING CONDITIONS

INHIBIT

Required Minimum

Model

Connection

Capacitor Value

Single Output

Positive Output (12 & 13) to

HR41-2805

Output Common (8 & 9)

220 µF, 10 V

Positive Output (10) to

Dual Outputs

Output Common (8)

100 µF, 25 V

HR42-2812

External Capacitor (14) to

100 µF, 25 V

and

Output Common (8)

HR42-2815

Negative Output (12) to

10 µF, 25 V

Output Common (8)

B4-52

HR40 SERIES
4 WATT

DC/DC C

ONVERTERS

ABSOLUTE MAXIMUM RATINGS

SINGLE AND DUAL OUTPUT MODELS

HR41-2805

HR42-2812

HR42-2815

PARAMETER

CONDITIONS

MIN TYP MAX

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

OUTPUT VOLTAGE

OUT

= 2 W

4.90

5.0

5.10

±11.88

±12

±12.12

±14.85

±15

±15.15

VDC

OUTPUT CURRENT

18 TO 32 V

700

±167

±133

OUTPUT POWER

Tc = 40°C TO +85°C

3.5

4.0

OUTPUT RIPPLE

BW = 1 MHz

150

mV p-p

LINE REGULATION

18 - 32 V

, P

OUT

= 2 W

LOAD REGULATION

NO LOAD TO FULL

INPUT VOLTAGE

Tc = 40°C TO +85°C

VDC

TRANSIENT 50 ms

INPUT CURRENT

NO LOAD

FULL LOAD

192

213

INHIBITED

EFFICIENCY

FULL LOAD

Input Voltage

· 16 to 32 VDC

Output Power

· 3.2 to 4 watts depending on model

Lead Soldering Temperature (10 sec)

· 300°C

Storage Temperature Range (Case)

· 40°C to +125°C

Output Voltage Temperature Coefficient

· HR41-2805 100 ppm/°C typ, 200 max.
· HR42-28XX 50 ppm/°C typ.
· HR43-28XX 100 ppm/°C typ.

Input to Output Capacitance

· 60 pF typical

Isolation

· 100 megohm minimum at 500 V

Conversion Frequency

· Single and dual output models, 80 kHz at

full load typical, variable frequency

· Triple output models, 200 kHz typical

fixed frequency

Inhibit Pin Voltage (unit enabled)

· 12 to 28 V

Input Voltage Range

· 16 to 32 VDC continuous
· 40 V for 50 ms transient

Case Operating Temperature (Tc)

· 40°C to +85°C full power
· 40°C to +105°C absolute

Derating Output Power/Current

· Linearly from 100% at 85°C to 0% at 105°C

Inhibit TTL Open Collector

· Logic low (output disabled)

0.8 V

· Referenced to input common
· Logic high (output enabled)

12 V

Notes
1. External capacitors required to prevent damage to internal circuitry (see

Table 1 for specifications).

2. Dual output models deliver up to 4 watts total for balanced or unbalanced

loads, however, the positive output should carry at least 25% of the total load.

FEEDBACK

LOGIC

TIMING

CONTROL

SWITCH

POSITIVE

OUTPUT

1, 2

POSITIVE

INPUT

INHIBIT

17, 18

INPUT

COMMON

NEGATIVE

OUTPUT

COMMON

EXTERNAL

CAPACITOR

TERMINAL

100

EXTERNAL

CAPACITORS

VOLTAGE

REGULATOR

IGURE

1: D

UAL

UTPUT

XTERNAL

APACITOR

ONNECTIONS

Table 1 Notes
1. Capacitors should be high quality, low ESR components --

solid tantalum is recommended.

2. See Figure 1 for connection diagram
3. Place positive side of capacitor toward pin 8.

ABLE

1: E

XTERNAL

APACITOR

EQUIREMENTS

Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.

ARNING

: E

XTERNAL

APACITORS

EQUIRED

TRIPLE OUTPUT EXTERNAL CAPACITOR

PERATION WITHOUT EXTERNAL CAPACITORS WILL RESULT IN DAMAGE TO THE INTERNAL CIRCUITRY

B4-53

HR40 SERIES

4 WATT

DC/DC C

ONVERTERS

Notes
1. External capacitors required to prevent damage to internal circuitry

(see Table 2 for specifications).

2. Minimum load required on main output for full power auxiliary oper-

ation.

FEEDBACK

LOGIC

TIMING

CONTROL

SWITCH

REF. &

COMP

DUAL

TRACKING

REGULATOR

+5 OUTPUT

6, 7

POSITIVE

AUXILIARY

OUTPUT

NEGATIVE

AUXILIARY

OUTPUT

COMMON

1, 2

POSITIVE

INPUT

INHIBIT

17, 18

INPUT

COMMON

220

EXTERNAL

CAPACITOR

Required Minimum

Model

Connection

Capacitor Value2

HR43-2812

Positive 5 VDC Output (9) to

and

Output Common (6 or 7)

220 µF, 10 V

HR43-2815

IGURE

RIPLE

UTPUT

XTERNAL

APACITOR

ONNECTIONS

Table 2 Notes
1. See Figure 2 for connection diagram.
2. Capacitors should be high quality, low ESR components --

solid tantalum is recommended.

ABLE

2: E

XTERNAL

APACITOR

EQUIREMENTS

TRIPLE OUTPUT MODELS

HR43-2812

HR43-2815

PARAMETER

CONDITIONS

MIN

TYP

MAX MIN

TYP

MAX

UNITS

OUTPUT VOLTAGE

OUT

= 2 W

MAIN

4.9

5.0

5.1

4.9

5.0

5.1

VDC

BALANCED LOAD

AUX

±11.5

±12.0

±12.5

±14.5

±15.0

±15.5

OUTPUT CURRENT

18 TO 32 V

MAIN

10.0

400

10.0

400

AUX

±50.0

±40.0

OUTPUT POWER

Tc = 40°C TO +85°C

3.2

OUTPUT RIPPLE

BW DC TO 1 MHz

MAIN

100

mV p-p

± AUX

100

LINE REGULATION

OUT

= 2 W

MAIN

18 TO 32 V

± AUX

7.5

LOAD REGULATION

NO LOAD TO FULL

MAIN

± AUX

INPUT VOLTAGE

Tc = 40°C TO +85°C

VDC

TRANSIENT 50 ms

NO LOAD

INPUT CURRENT

FULL LOAD

176

INHIBITED

EFFICIENCY

FULL LOAD

Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.

ARNING

: E

XTERNAL

APACITORS

EQUIRED

PIN OUT

Pin

Single Output

Dual Output

Triple Output

1, 2

Positive Input

No connection

Case

No connection

Negative Aux. Output

No connection

No Connection

Output Common Main

No connection

Output Common Aux.

Output Common

Positive Aux. Output

Output Common

No connection

+5 VDC Output

No connection

Positive Output

No connection

Positive Output

Negative Output

No connection

Positive Output

No connection

Ext. Capacitor

No connection

Inhibit

No connection

17, 18

Input Common

HR4 3 - 28 12

Base Model

Input Voltage

Output Voltage

Number of Outputs

(1 = single, 2 = dual, 3 = triple)

(Auxiliary output on triple output models)

B4-54

HR40 SERIES
4 WATT

DC/DC C

ONVERTERS

MODEL NUMBERING KEY

Pin Out Notes
1. Make external connection to both pins on all models.

Pins 1 and 2 positive input
Pins 17 and 18 input common

2. Pins 6 and 7 on triple output models are connected internally.
3. On the HR41-2805:

Make external connections to both output common pins (8 and 9).
Make external connections to both positive output pins (12 and 13).

Dot on top of cover
indicates pin one.

BOTTOM VIEW

HR40

1 2

See Section B8. case C2, for dimensions

IGURE

3: P

ARNING

: E

XTERNAL

APACITORS

EQUIRED

PERATION WITHOUT EXTERNAL CAPACITORS WILL RESULT IN DAMAGE TO THE INTERNAL CIRCUITRY

24021-009-DTS Rev A

DQ# 2012

All technical information is believed to be accurate, but no responsibility is
assumed for errors or omissions. Interpoint reserves the right to make changes in
products or specifications without notice. HR40 Series is a trademark of Interpoint.
Copyright © 1994 - 1999 Interpoint. All rights reserved.

B8-8

CASE C

ASES

CASE C

BOTTOM VIEW

See Figures 9 - 11

for pin configurations.

1.075 max

(27.31)

Materials
Header Case C1

Cold Rolled Steel/Nickel/Gold

Cases C2 and C3

Kovar/Nickel/Tin

Cover Case

Cold Rolled Steel/Nickel

Cases C2 and C3

Kovar/Nickel/Tin

Pins Case

Copper/Nickel/Gold

Cases C2 and C3

Kovar/Nickel/Gold,
matched glass seal

Case dimensions in inches (mm)
Tolerance

0.005 (0.13) for three decimal places

0.01 (0.3) for two decimal places

unless otherwise specified

1.075 max

(27.31)

CAUTION
Heat from reflow or wave soldering may
damage the device. Solder pins
individually with heat application not
exceeding 300

C for 10 seconds per

pin.

Dot on top of case
indicates pin one

0.000

0.132

(3.35)

0.932

(23.67)

0.000

0.132 (3.35)

0.332 (8.43)

0.532 (13.51)

0.732 (18.59)

0.932 (23.67)

0.025

(0.64)

dia.

0.000

0.270 max.

(6.86)

MSA Series: Screening Standard, ES, or 883
SMSA Series: Screening Space Standard, H, or K

BOTTOM VIEW CASE C1

0.205

0.010

(5.21

0.25)

0.000

0.270 max.

(6.86)

0.205

0.010

(5.21

0.25)

Projection Weld

Seam Seal

Squared corner and dot on
top of case indicate pin one.

1 2

0.018

0.002 dia.

(0.46

0.05)

0.350 (8.89)

0.000

Pins equally

spaced

Marker bead
on pin 18

MSR Series: Screening Standard or ES
HR40 Series: No screening options

BOTTOM VIEW CASE C2

0.205

0.010

(5.21

0.25)

Dot on top of case
indicates pin one

0.100 (2.54)

0.370 max.

(9.40)

0.800 (20.32)

0.800 (20.32

1 2

0.018

0.002 dia.

(0.46

0.05)

MSF EMI Filter: Screening Standard or ES

BOTTOM VIEW CASE C3

0.350 (8.89)

0.000

0.370 max.

(9.40)

0.205

0.010

(5.21

0.25)

Dot on top of case
indicates pin one

0.100 (2.54)

0.800

(20.32)

0.800 (20.32

0.600

(15.24)

0.300

(7.62)

0.000

0.365 max.

(9.27)

0.205

0.010

(5.21

0.25)

Seam Seal

IGURE

ASE

IGURE

10:

ASE

IGURE

11:

ASE

IGURE

8: C

ASE

AXIMUM

IMENSIONS

Note: Although every effort has been

made to render the case drawings at
actual size, variations in the printing
process may cause some distortion.
Please refer to the numerical dimen-
sions for accuracy.

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: HR42-2815