Datasheet DHC2803SK, DHC2803SH, DHC2803SE, DHC2803S, DHC2805SK Datasheet (MSK)

HI-REL DESIGN

• WAVE SOLDERABLE PACKAGE

• ALL CERAMIC CAPACITORS

• SURFACE MOUNT MAGNETICS

• WITHSTANDS 5000G

FEATURES — SINGLE OUTPUT

• REPLACES APEX DHC2803S & DHC2805S

•

NO DERATING — -55°C to +125°C

• WIDE SUPPLY RANGE — 12V to 50V

• HIGH ISOLATION — 500V

• HIGH POWER DENSITY — 17W/IN

3

•

OUTPUT VOLTAGE ADJUSTMENT —
STANDARD

• REMOTE SHUTDOWN

• OPERATES TO 11VIN AT 5W

• AVAILABLE WITH 3.3V OR 5V OUTPUTS

•

SEE DAC2800S SERIES FOR 12V AND 15V VERSIONS

DESCRIPTION

The DHC2800S series of DC-DC converters provides the
ruggedness, reliability, and features required to meet the
advanced design challenges of today’s hi-rel market. This is
accomplished while retaining a power density of 17 W/in

3

and
425 mW/gram of power/package performance. The use of
advanced substrate and reflow soldering techniques during
construction results in a rugged, cost-effective, and com­pletely solderable package.

DHC2800S hybrid converter series utilizes all ceramic
capacitors and surface mount magnetics to provide reliable
operation at all operating temperatures while surviving very
high G forces.

DHC2800S standard features include output fault monitor­ing and/or turn on voltage point programming via the shut­down pin. All three functions may be implemented simulta­neously with a minimum of external components. An output
voltage adjustment/load compensation pin is also standard.

Fault tolerant design protects these converters from most
external circuit faults. The output and output adjust pins will
withstand +35 V while the shutdown pin will withstand +50 V
protecting the converters from a variety of system or board
faults i.e. solder bridges etc. Unique load fault protection
circuitry allows this converter to pull up loads having difficult
static load line characteristics and allows short term load
excursions significantly beyond ratings in most applications.

A transformer isolated forward converter topology operat­ing at a switching frequency of 400 kHZ allows operation over
a wide input voltage range. Internal filtering of both input and
output eliminates the need for external capacitors in many
applications.

The 8-pin DIP package is hermetically sealed and isolated
from the internal circuits. Heat sinking is recommended for full
power operation at elevated ambient temperatures.

EXTERNAL CONNECTIONS

BLOCK DIAGRAM

P W M

FEED FORWARD

CONTROLLER

ERROR AMPLIFIER

REFERENCE AND

ISOLATION

3

1

2

6

5

7

TYPICAL APPLICATION WITH OPTIONS

4707 Dey Road Liverpool, N.Y. 13088

M.S.KENNEDY CORP.

[phone]

DHC2800S

SERIES

ISO-9001 CERTIFIED BY DSCC

6W

DC-DC

CONVERTERS

Rev. A 3/01

1

1
2
3
4
5

+OUTPUT

-OUTPUT
ADJUST/COMP
NO CONNECTION
SHUTDOWN PLUS

8
7
6

CASE

-INPUT
+INPUT

NOTES: 1. Unless otherwise stated: TC = 25°C, VIN = 28V, I

OUT

= I

OUT

MAX.

2. Derate power linearly to zero from 125°C to 135°C.

3. Regulation measured between pin 1 and pin 2 1/6" from case.

4. Recovery spec assumes that converter has been OFF for at least 500ms.

5. DHC2803S I

OUT MAX

= 2.0ADC when voltage is adjusted to 3.0Vdc, VIN = 13-50Vdc, and C

LOAD

= 100µF.

6. DHC2803S P

OUT MAX

= 6W when VIN = 13-50Vdc

CAUTION: The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or

subject to temperatures in excess of 850°C to avoid generating toxic fumes.

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

DHC2800S SERIES

ABSOLUTE MAXIMUM RATINGS

DHC2803SDHC2803S

DHC2803SDHC2803S

DHC2803S

DHC2805SDHC2805S

DHC2805SDHC2805S

DHC2805S

INPUT VOLTAGE RANGE (Pin 7 to 6 or 5) 0 – 50Vdc 0-50Vdc
INPUT TRANSIENT (Pin 7 to 6) 80V @ 50ms 80V @ 50ms
OUTPUT WITHSTAND (Pin 2 to 1 or 3) 35Vdc 35Vdc
OUTPUT CURRENT (Continuous) 2Adc

5

1.2Adc
TEMPERATURE, Storage –65°C, 150°C –65°C, 150°C
TEMPERATURE, Pin Soldering 10s 300°C 300°C

SPECIFICATIONS

PARAMETER TEST CONDITIONS

1

MIN TYP MAX MIN TYP MAX UNITS

STEADY STATE
CHARACTERISTICS

INPUT VOLTAGE RANGE 12 28 50 12 28 50 Vdc
OUTPUT VOLTAGE VIN; min ↔ max Vdc @ I

MIN

3.2 3.3 3.4 5.00 5.05 5.1 Vdc

OUTPUT CURRENT VIN; min ↔ max Vdc 180 1520 120 1200 mAdc

VIN; 13 ↔ max Vdc 1820

5

mAdc

EFFICIENCY 61 66 64 69 %
OUTPUT RIPPLE VOLTAGE Bandwidth 10kHz ↔ 1MHz 38 80 30 80 mVrms
INPUT RIPPLE CURRENT Bandwidth 10kHz ↔ 1MHz 30 100 30 100 mArms

OUTPUT POWER

2

.5 5.0

6

.6 6.0 W

LINE REGULATION VIN; min ↔ max

3

6 15 6 15 mVdc

LOAD REGULATION I

OUT

; min ↔ max

3

10 25 10 25 mVdc

TEMPERATURE COEFFICIENT .006 .006 %/°C
TEMPERATURE RANGE, case

2

–55 125 –55 125 °C

QUIESCENT CURRENT I

OUT

= 0A 38 45 38 45 mAdc

INHIBITED Vpin5; < 8Vdc .09 1.25 2.5 .09 1.25 2.5 mAdc

ISOLATION CHARACTERISTICS
(input/output/case)

LEAKAGE RESISTANCE V

TEST

= 500Vdc 100 100 MΩ

LEAKAGE CAPACITANCE f = 10kHz 55 60 pF
DYNAMIC CHARACTERISTICS

LINE STEP RESPONSE VIN; TR, TF = 10µs

VOLTAGE CHANGE VIN; 16 ↔ 40 Vdc 350 300 mV
RECOVERY TIME (95%) 30 30 µs

LOAD STEP RESPONSE I

OUT

; TR, TF = 10µs

VOLTAGE CHANGE I

OUT

; 50% ↔ max Adc 700 700 mV

RECOVERY TIME (95%) 30 40 µs

DYNAMIC CHARACTERISTICS
START-UP OVERSHOOT VIN; 0-50 Vdc 0 400 0 400 mV

SHUTDOWN DELAY V

PIN5

; > 10Vdc → <8Vdc 220 500 220 500 µs

SHUTDOWN RECOVERY TIME4V

PIN5

; < 8Vdc → > 10Vdc 60 60 ms

CAUTION

DHC2803SDHC2803S

DHC2803SDHC2803S

DHC2803S

DHC2805SDHC2805S

DHC2805SDHC2805S

DHC2805S

PACKAGE THERMAL SPECIFICATIONS MIN TYP MAX UNITS

RESISTANCE, case to air 30 °C/W
TEMPERATURE RISE, junction to case 10 15 °C

Rev. A 3/01

2

TYPICAL PERFORMANCE
GRAPHS

DHC2803S

LINE TRANSIENT RESPONSE

0.0 2.0
OUTPUT CURRENT, I

OUT

(A)

10

12

14

16

LOW LINE DROP OUT

INPUT VOLTAGE, V

IN

(V)

0.5 1.0 1.5

10K 90K60K

20K

30K 40K

INPUT VOLTAGE, V

IN

(V)

TIME, t (500µsec/DIV)

LOAD TRANSIENT RESPONSE 1000µF LINE TRANSIENT RESPONSE

EFFICIENCY CONTOURS

11

30

50

40

20

OUTPUT RESPONSE, X (UNITS/DIV)

OUTPUT CURRENT, I

OUT

(A)

1.44.18 .36 .72 1.08 1.8 1.44.18 .36 .72 1.08 1.8 1.44.18 .36 .72 1.08 1.8

SET POINT RESISTOR, R

SP

(Ω) TIME, t (5msec/DIV)

12

16

20

24

28

TURN ON THRESHOLD

TURN ON VOLTAGE, E

TO

(V)

TURN ON RESPONSE

100 200 400

FREQUENCY, f (Hz)

–100

AUDIO REJECTION

AUDIO REJECTION, A

V

(dB)

0

–20

–40

1K 2K 4K 10K 20K 40K 100K

–60

–80

RESPONSE, X (UNITS/DIV)

3.3V

0V

0V

28V

V

OUT

V

IN

TEMP = 25°C

30%

40%

50%

55%

60%

63%

65%

67%

68%

69%

70%

INPUT VOLTAGE, V

IN

(V)

EFFICIENCY CONTOURS

OUTPUT CURRENT, I

OUT

(A)

TEMP =
125°C

30%

40%

50%

55%

60%

62%

64%

65%

66%

67%

INPUT VOLTAGE, V

IN

(V)

EFFICIENCY CONTOURS

11

50

40

20

30

11

50

40

20

30

OUTPUT CURRENT, I

OUT

(A)

TEMP = –55°C

30%

40%

50%

55%

67%
68%

68%

60%

65%

66%

63%

INCLUDES 1000µF ON OUTPUT BUS

TIME, t (200µsec/DIV)

TIME, t (200µsec/DIV)TIME, t (200µsec/DIV)

LOAD TRANSIENT RESPONSE 100µF

OUTPUT RESPONSE, X (UNITS/DIV)OUTPUT RESPONSE, X (UNITS/DIV)

OUTPUT RESPONSE, X (UNITS/DIV)

INCLUDES 100µF ON OUTPUT BUS

TIME, t (100µsec/DIV)

LOAD TRANSIENT RESPONSE

OUTPUT RESPONSE, X (UNITS/DIV)

1.8A

1.8A

.9A

.9A

V

OUT

V

OUT

V

OUT

V

OUT

V

IN

V

IN

11V

16V

.9A

80V

40V

1.8A

LOAD 1.8A

V

OUT

I

OUT

I

OUT

I

OUT

1 V500mA

1 V500mA

100mV20V

50mV10V

1 V

10 V 1 V

500mA

NO OUTPUT BUS CAPCITANCE

VIN = 28V
I

OUT

= 2.0A

OUTPUT DC

CURRENT RATING

INCLUDES 100µF ON

OUTPUT BUS

Rev. A 3/01

3

TYPICAL PERFORMANCE

GRAPHS

DHC2805S

LINE TRANSIENT RESPONSE

0.0 1.6
OUTPUT CURRENT, I

OUT

(A)

10

12

14

16

LOW LINE DROP OUT

INPUT VOLTAGE, V

IN

(V)

0.4 0.8 1.2

10K 90K60K

20K

30K 40K

INPUT VOLTAGE, V

IN

(V)

TIME, t (500µsec/DIV)

LOAD TRANSIENT RESPONSE 1000µF LINE TRANSIENT RESPONSE

EFFICIENCY CONTOURS

11

30

50

40

20

OUTPUT RESPONSE, X (UNITS/DIV)

OUTPUT CURRENT, I

OUT

(A)

.96.12 .24 .48 .78 1.2

SET POINT RESISTOR, R

SP

(Ω) TIME, t (5msec/DIV)

12

16

20

24

28

TURN ON THRESHOLD

TURN ON VOLTAGE, E

TO

(V)

TURN ON RESPONSE

100 200 400

FREQUENCY, f (Hz)

–100

AUDIO REJECTION

AUDIO REJECTION, A

V

(dB)

0

–20

–40

1K 2K 10K 20K 100K

–60

–80

RESPONSE, X (UNITS/DIV)

5.0V

0V

0V

28V

V

OUT

V

IN

TEMP = 25°C

TEMP = 25°C

30%

40%

50%

55%

60%

65%

68%

70%

71%

72%

INPUT VOLTAGE, V

IN

(V)

EFFICIENCY CONTOURS

OUTPUT CURRENT, I

OUT

(A)

TEMP =
125°C

30%

40%

50%

55%

60%

63%

66%

68%

69%

70%

INPUT VOLTAGE, V

IN

(V)

EFFICIENCY CONTOURS

11

50

40

20

30

11

50

40

20

30

OUTPUT CURRENT, I

OUT

(A)

.96.24.12 .48 .78 1.2 .96.24.12 .48 .78 1.2

TEMP = –55°C

30%

40%

50%

55%

68%

69%

70%

60%

66%

63%

INCLUDES 1000µF ON OUTPUT BUS

TIME, t (200µsec/DIV)

TIME, t (200µsec/DIV)TIME, t (200µsec/DIV)

LOAD TRANSIENT RESPONSE 100µF

OUTPUT RESPONSE, X (UNITS/DIV)OUTPUT RESPONSE, X (UNITS/DIV)

OUTPUT RESPONSE, X (UNITS/DIV)

INCLUDES 100µF ON OUTPUT BUS

INCLUDES 100µF ON OUTPUT BUS

INCLUDES 100µF ON OUTPUT BUS

INCLUDES 100µF ON OUTPUT BUS

TIME, t (100µsec/DIV)

LOAD TRANSIENT RESPONSE

OUTPUT RESPONSE, X (UNITS/DIV)

1.2A

LOAD = 1.2A

LOAD = 1.2A

LOAD = 1.2A

1.2A

600mA

600mA

V

OUT

V

OUT

V

OUT

V

OUT

V

IN

V

IN

11V

16V

600mA

80V

40V

1.2A

V

OUT

I

OUT

I

OUT

I

OUT

1 V500mA

1 V500mA

100mV20V

50mV10V

1 V

10 V 2 V

500mA

NO OUTPUT BUS CAPCITANCE

VIN = 28V
I

OUT

= 1.2A

OUTPUT DC

CURRENT RATING

Rev. A 3/01

4

APPLICATION
INFORMATION

DHC2800S SERIES

3 1 2

50K

10nF

OUTPUT ADJUST / COMP

The output voltage of the DHC2800S may be adjusted
from 90% to 110% of nominal value by the use of a 50KΩ
potentiometer as shown. Adjustment beyond this range is
possible however certain characteristics of the converter such
as but not limited to input voltage range, efficiency, ripple and
temperature performance will change. Characterization by
the user is recommended in such applications.

Adjust/comp (pin 3) may be driven by external circuitry
referenced to pin 2 (-output) if desired. Grounding pin 3 causes
voltage to increase (25% typically) while driving pin 3 above

1.3 V causes output voltage to decrease. Pin 3 may be driven
through 10KΩ or more if connection of the comp function is
also required.

The comp function of pin 3 allows capacitive loads as large
as 1000 µF to be accommodated on the DHC2805S without
loss of stability. This feature may be utilized by connecting a
10 nF capacitor between pins 3 and 1. This is generally
recommended when low ESR load capacitances of 100 µF or
greater are used.

SHUTDOWN PLUS

Pin 5 is used for remote shutdown, output fault detection,
and/or setting the input voltage point at which the converter
will turn on as shown in the typical application diagram. No
connection to pin 5 is necessary for normal operation of the
converter. Pin 5 is referenced to the –input (pin 7).

Shutdown may be implemented by simply connecting pin
5 to an open collector logic output or switch rated at 2.5 mA,
25 Vdc or higher.

Input voltage turn on point is programmed with a single
resistor from pin 5 to 7. An input turn on/off hysteresis (typically

3.5% of Vin) will be observed. This should be considered when
making or verifying set point adjustment. The value of the
setpoint resistor may be determined by the following:

210 • 10

3

R = (±10% accuracy at 25°C)

ETO – 9.5

Set point temperature coefficient is typically +400ppm/°C.

Output fault monitoring is accomplished by observing pin
5 with a high impedance monitoring circuit. Pin 5 voltage drops
from over 10 V to below 1 V when a load fault causes the
converters fault protection circuitry to activate. It will remain
low for at least 100 ms and return high. If the load fault is still
present pin 5 will return low and the cycle will repeat. A resistor
> 400 KΩ from pin 5 to 7 provides pull down for pin 5 if there
is no input setpoint programming resistor already in place.

V

o

NORMAL

TIME

NORMALLOAD FAULT

O

I

o

O

LOAD FAULT RESPONSE

The DHC2800S series of dc-dc converters share load fault
philosophies. Load fault conditions include short-circuit and
severe overload conditions. The DHC2800 converter series
responds to load faults by turning off all power conversion
circuits for 250 mS and then attempting to restart for 10 mS
(typical). The net "on" duty factor during a fault is very low
resulting in low converter dissipation and immunity from
overheating at 125°C. Current beyond rated can flow into the
load at startup time. This allows the converter to bring up
capacitive and other difficult load types more reliably than
competing converters.

Rev. A 3/01

5

The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make

changes to its products or specifications without notice, however, and assumes no liability for the use of its products.

Please visit our website for the most recent revision of this datasheet.

M.S. Kennedy Corp.

4707 Dey Road, Liverpool, New York 13088

Phone [phone]

FAX [phone]

www.mskennedy.com

NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.

ESD Triangle indicates Pin 1.

DHC2805S

The above example is an industrial grade 5V single output converter

ORDERING INFORMATION

SCREENING

BLANK= INDUSTRIAL; E= EXTENDED RELIABILITY;

H= CLASS H; K= CLASS K

SINGLE OUTPUT

OUTPUT VOLTAGE

03=3.3V; 05=5V

NOMINAL INPUT VOLTAGE

GENERAL PART NUMBER

Rev. A 3/01

6

MECHANICAL SPECIFICATIONS