IOR ATW28XXD User Manual

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PD - 94557

A TW28XXD SERIES

ADVANCED ANALOG
HYBRID-HIGH RELIABILITY
DC/DC CONVERTERS

Description

The ATW28XXD Series of DC/DC converters feature
high power density and an extended temperature range
for use in military and industrial applications. Designed
to MIL-STD-704 input requirements, these devices op­erate with a nominal 28 VDC inputs with ±12V and ±15V
dual outputs to satisfy a wide range of requirements.
The circuit design incorporates a pulse width modu­lated push-pull topology operating in the feed-forward
mode at a nominal switching frequency of 270KHz. Input
to output isolation is achieved through the use of trans­formers in the forward and feedback circuits.

The advanced feedback design provides fast loop re­sponse for superior line and load transient character­istics and offers greater reliability and radiation toler­ance than devices incorporating optical elements in
the feedback circuits.

Three standard temperature grades are offered. Refer
to Part Number section for more severe environments.

Manufactured in a facility fully qualified to MIL-PRF­38534, these converters are available in four screen­ing grades to satisfy a wide range of requirements. The
CH grade is fully compliant to the requirements of MIL­PRF-38534 for class H. The HB grade is processed
and screened to the class H requirement, but may not
necessarily meet all of the other MIL-PRF-38534 re­quirements, e.g., element evaluation and Periodic In­spection (PI) not required. Both grades are tested to
meet the complete group “A” test specification over the
full military temperature range without output power
deration. Two grades with a more limited screening
are also available for use in less demanding applica­tions. Variations in electr ical, mechanical and screen­ing can be accommodated. Contact Advanced Analog
for special requirements.

28V Input, Dual Output

ATW

Features

n 18 to 40 VDC Input Range (28 VDC Nominal)

n

±12V and ±15V Outputs Available

n Indefinite Short Circuit and Overload
Protection

n 22.8 W/in
n 30 W
n Fast Loop Response for Superior Transient

Characteristics
n Operating Temperature Range from -55°C to
+125°C Available

n Popular Industry Standard Pin-Out
n Resistance Seam Welded Case for Superior

Long Term Hermeticity

n Efficiencies up to 85%
n Shutdown from External Signal
n Full Military Screening
n 200,000 hour MTBF at 85°C

n MIL-PRF-38534 Compliant Versions

Available

3

Power Density

Output Power

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10/24/02

ATW28XXD Series

Specifications

ABSOLUTE MAXIMUM RATINGS

Input Voltage -0.5V to 50V

A TW2812D

Soldering Temperature 300°C for 10 seconds
Case Temperature Operating -55°C to +125°C
Storage -65°C to +135°C

T able I. Electrical P erformance Characteristics

Test Symbol Conditions

-55°C ≤Tc ≤+125°C

Vin = 28 Vdc ±5%, C

Unless otherwise specified

= 0

L

Group A

Subgroups

Min Max
Output voltage V
2,3

Output current

1, 2

Output ripple vol t ag e 3
Line regulation 4

I

OUT

VIN = 18, 28, and 40 V dc,

I

OUT

VIN = 18, 28, and 40 V dc,

V

RIP

VR

LINE

= 0 1 All

OUT

each output
B.W. = 20Hz to 2MHz

VIN = 18, 28, and 40 V dc,

Iout = 0,1250, and 2500mA

1,2,3 All 250 2250 mA
1,2,3 All 85 mVp-p

1 All 30 mV

2,3 60

VR

Load regulation 4
Cross regulation 5

Input current IIN I
I

Input ripple current

3, 4

Efficiency 4

Isolation ISO Input to output or any pin

VIN = 18, 28, and 40 V dc,

LOAD

VR

CROSS

I

I

RIP

I

E

FF

= 0, 1250, and 2500mA

I

OUT

10% to 90% load change 1,2,3 All 3.5 %

= 0, inhibit (pin 8)

OUT

tied to input return (pin 10)

= 0,inhibit (pin 8)= open 50

OUT

= 2500mA

OUT

B.W. = 20Hz to 2MHz

= 2500mA 1 All 80 %

OUT

T

= +25°C

C

1,2,3 All 120 mV

1,2,3 All 18 mA

1,2,3 All 50 mAp-p

1 All 100

to case (except pin 7) at

Capacitive load

6, 7

500 V dc Tc = +25°C

CL No effect on dc

performance, Tc = +25°C,

4 All 200 µF

total for both out put s
Power diss ip ation
load fault

Switching frequency 4

PD

I

F

S

Overload, T

Short circui t, T

= 2500mA 4,5,6 01 250 300 KHz

OUT

= +25°C 8

C

= +25°C

C

1 All 12 W

9

02 250 270
03 275 300
Output response to s tep
transient load
changes

4, 9

1250mA to/from 2500mA 4,5,6 All -400 +400 mV pk

VO

TLOAD

0mA to/from 2500mA 4,5,6 All -800 +800
Recovery time step
transient load
changes

4, 9, 10

1250mA to/from 2500mA 4,5,6 All 70 µs

TT

LOAD

0mA to/from 1250mA 4,5,6 All 500
1250mA to/from 0mA 4,5,6 All 5 ms

Device

Types

Limits Unit

11.88 ±12.12

±

11.76 ±12.24

±

V

MΩ

For Notes to Specifications, refer to page 3

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ATW28XXD Series

T able I. Electrical P erformance Characteristics - continued

Test Symbol Conditions

-55°C ≤Tc ≤+125°C

Vin = 28 Vdc ±5%, C

unless otherwise specified

= 0

L

Group A

Subgroups

Device

Limits Unit

Types

A TW2812D

Min Max

Output response
transient step line
changes

4, 7, 11

Recovery time
transient step line

4, 7, 10, 11

change
Turn on overshoot 4
Turn on delay

4, 12

Load fault recovery 7

Input step from/to 18 to 40

VO

TLINE

Vdc, I

= 2500mA

OUT

Input step from/to 18 to 40

TT

LINE

Vdc, I

= 2500mA

OUT

VTon

I

OS

Ton

I

D

Tr

4,5,6 All 14 ms

LF

0 and 2500mA 4,5,6 All 750 mV pk

OUT =

= 0 and 2500mA

OUT

4,5,6 All -800 +800 mV pk

4,5,6 All 4000

4,5,6 All 14 ms

s

µ

Weight Flange 75 grams

Notes to Specifications

1 Parameter guaranteed by line, load and cross regulation tests.
2 Up to 90% of full power is available from either output provided the total output does not exceed 30W.
3 Bandwidth guaranteed by design. Tested for 20KHz to 2MHz.
4 Load current split equally between +V
5 Three-watt load on output under test, 3 watt to 27 watt load change on other output.
6 Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the
operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
7 Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table I.
8 An overload is that condition with a load in excess of the rated load but less than that necessary to
trigger the short circuit protection and is the condition of maximum power dissipation.
9 Load step transition time between 2 and 10 microseconds.
10 Recovery time is measured from the initiation of the transient to where V
percent of V
11 Input step transition time between 2 and 10 microseconds.

at 50 percent load.

OUT

12 Tur n-on delay time measurement is for either a step application of power at the input or the removal of
ground signal from the inhibit pin (pin 8) while power is applied to the input.

OUT

and –V

OUT

.

has returned to within ±1

OUT

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