MSK DHD2805SK, DHD2805SH, DHD2805SE, DHD2805S Datasheet

HI-REL DESIGN

• WAVE SOLDERABLE PACKAGE

• ALL CERAMIC CAPACITORS

• SURFACE MOUNT MAGNETICS

• WITHSTANDS 5000G

FEATURES — SINGLE OUTPUT

• REPLACES APEX DHW2805S

•

NO DERATING — -55°C to +125°C

• WIDE SUPPLY RANGE — 16V to 40V

• HIGH ISOLATION — 500V

• HIGH POWER DENSITY — 17W/IN

3

•

OUTPUT VOLTAGE ADJUSTMENT —
STANDARD

• REMOTE SHUTDOWN

• OPERATES TO 11VIN AT 5W

• AVAILABLE WITH 5V OUTPUT

DESCRIPTION

The DHD2805S DC-DC converter 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.

DHD2805S 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.

DHD2805S 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

4707 Dey Road Liverpool, N.Y. 13088

M.S.KENNEDY CORP.

DHD2805S

ISO-9001 CERTIFIED BY DSCC

7.5W

DC-DC

CONVERTER

Rev. - 3/01

1

1
2
3
4
5

+OUTPUT

-OUTPUT
ADJUST/COMP
NO CONNECTION
SHUTDOWN PLUS

8
7
6

CASE

-INPUT
+INPUT

[phone]

TYPICAL APPLICATION WITH OPTIONS

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. Input voltage can be increased to 12V to 50V at 5W output power.

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

DHD2805S

ABSOLUTE MAXIMUM RATINGS

DHD2805SDHD2805S

DHD2805SDHD2805S

DHD2805S

INPUT VOLTAGE RANGE (Pin 7 to 6 or 5) 0-50Vdc
INPUT TRANSIENT (Pin 7 to 6) 80V @ 50ms
OUTPUT WITHSTAND (Pin 2 to 1 or 3) 35Vdc
OUTPUT CURRENT (Continuous) 1.2Adc
TEMPERATURE, Storage –65°C, 150°C
TEMPERATURE, Pin Soldering 10s 300°C

SPECIFICATIONS

PARAMETER TEST CONDITIONS

1

MIN TYP MAX UNITS

STEADY STATE
CHARACTERISTICS

INPUT VOLTAGE RANGE

5

16 28 40 Vdc

OUTPUT VOLTAGE VIN; min ↔ max Vdc @ I

MIN

5.00 5.05 5.10 Vdc

OUTPUT CURRENT VIN; min ↔ max Vdc 120 1500 mAdc

EFFICIENCY 62 67 %
OUTPUT RIPPLE VOLTAGE Bandwidth 10kHz ↔ 1MHz 40 80 mVrms
INPUT RIPPLE CURRENT Bandwidth 10kHz ↔ 1MHz 40 100 mArms

OUTPUT POWER

2

0.6 7.5 W

LINE REGULATION VIN; min ↔ max

3

9 25 mVdc

LOAD REGULATION I

OUT

; min ↔ max

3

15 35 mVdc

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

2

–55 125 °C

QUIESCENT CURRENT I

OUT

= 0A 38 45 mAdc

INHIBITED Vpin5; < 8Vdc .09 1.25 2.5 mAdc

ISOLATION CHARACTERISTICS
(input/output/case)

LEAKAGE RESISTANCE V

TEST

= 500Vdc 100 MΩ

LEAKAGE CAPACITANCE f = 10kHz 60 pF
DYNAMIC CHARACTERISTICS

LINE STEP RESPONSE VIN; TR, TF = 10µs

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

LOAD STEP RESPONSE I

OUT

; TR, TF = 10µs

VOLTAGE CHANGE I

OUT

; 50% ↔ max Adc 700 mV

RECOVERY TIME (95%) 40 µs

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

SHUTDOWN DELAY V

PIN5

; > 10Vdc → <8Vdc 220 500 µs

SHUTDOWN RECOVERY TIME4V

PIN5

; < 8Vdc → > 10Vdc 60 ms

CAUTION

DHD2805S DHD2805S

DHD2805S DHD2805S

DHD2805S

PACKAGE THERMAL SPECIFICATIONS MIN TYP MAX UNITS

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

Rev. - 3/01

2