Datasheet ACT8615, ACT8614, ACT8613, ACT8612, ACT8611 Datasheet (ACT)

ACT861X Series

Radiation Hardened

50 Watt Power Supply Module

Features

Advanced

■

Radiation Environment

●

Total Dose 100K Rad (Si)

●

No SEE or SEU to 20 MeV/cm2/mg

■

-55oC to 85oC Baseplate Mounting Temperature

■

50W Power Output, +5V, +12V, +15V, -12V and –15V Output Versions Available

■

50V Input Bus

■

Internal EMI Suppression Circuitry designed to meet the requirements of MIL-STD-461C

■

Short Circuit Protected

■

Input Undervoltage Shutdown

■

Output Overvoltage Shutdown

■

Overtemperature Shutdown

■

Input Shutdown Control

■

Input Synchroni zation Control

■

Output Synchronization Control

■

Output Status Signal

■

Packaging – Non-Hermetic COB in a 3" x 4" x .9" housing with D connector

CIRCUIT TECHNOLOGY

www.aeroflex.com

X

L

O

E

L

F

A

B

R

E

ISO

A

9001

C

E

R

T

E

I

F

I

S

I

N

C

.

D

VIN+

VIN-

INHIBIT

SYNC_IN

IN_C O M

INPU T

CONTROL

CIRCUITRY

Figure 1 – Block Diagram

OUTPUT

CONTROL

CIRCUITRY

VO+

VO-

ST ATU S

SYNC_OUT

OUT_COM

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General Description

Aeroflex’s ACT861X series of power supply modules are radiation hardened 50 Watt units
designe d for use in space applications. U sing a double en ded forward topolo gy with synchrono us
rectifiers ac hieves hig h e ffici ency, and the us e o f C hi p-On- Bo ard (C OB ) co nst ruc tion to geth er w ith
planar ma gnetics allows Aeroflex to provi de s pace qual ity c omponents at down-t o-eart h prices.

The ACT86 1X series a re full featured sin gle output co nverte rs, with EMI filt ering, shor t circuit
protection, input undervoltage shutdown, output overvoltage shutdown, overtemperature shutdown,
input s hutdown c ontro l and syn chroniz ation on both input and out put side s. Other o utput voltages
are available upon request.

Aeroflex’s ACT861X series of power supply modules are radiation hardened 50 Watt units
designe d for use in sp ace a pplic atio ns. The block diagram shown i n F igure 1 use s a two trans istor
(double ended) forward topology to minimize voltage stresses on the semiconductors, and
synchronous rectifiers are used to achieve high efficiency. These full featured converters are
intended to be used in the space environment, conduction cooled to a baseplate and
interconnected to the system via a D connector. The converter includes features such as input
undervoltage shutdown, output overvoltage shutdown, overtemperature shutdown, input shutdown
control and synchronization on both input and output sides. No optocouplers are used in the
conver te r to as s ure long term tota l dose hardn es s.

The ACT861X series is fabricated as an encapsulated Chip-On-Board module in an aluminum
housing. The Out line Drawing is show n in Figure 2.

The input undervoltage shutdown disables the converter when the input bus is below the
minimum specified setpoint. Nominal input current will be the shutdown current specified. This
prevents the converter from generating low output voltages in the event of bus undervoltages and
drawing high input currents when attempting to power the rated load with these low bus input
voltages. When the input bus voltage is above the minimum specified in Table 1 the converter
commences operat ion.

Overt emperature prote ction is integral to the ACT861X se ries. An interna l temperature sen sor
mounted near the higher power dissipating components shuts the converter off if the mounting
tempe rature is ab ove the thres hold specified in Table 1. When t he converter cools off it will tur n
back on with no cycling of input power required.

The out put overvoltag e circu it uses a port ion of the output voltage der ived to pow er the in tern al
logic (the bootstrap supply) to measure indirectly the output voltage. This voltage is sensed, and if it
exceeds a predetermined threshold the converter will cycle at a nominal 100Hz frequency
attempting to restart.

Control of the ACT861X is achieved via the
tempe rature monit or and to control th e module. W hen
module is disa bled. Nom inal curren t flowing throu gh the
and the on/off threshold is 6V above the negative return. When the converter temperature sensor is
at –55° C the

INHIBIT

line will be approxi mately 8.7V; at 85°C it will be approximate ly 6.7V. This

affords the user a convenient way to measure the c onverter internal temperat ure.

Synchr oniz ation may eit her be re ferenced to t he ou tput groun d o f the c o nver ter o r inpu t grou nd.
When synchronization is referenced to the input ground a low impedance clock waveform,
approximately 50% duty cycle, TTL compatible between 450 and 500KHz, should be applied to the

SYNC_IN

term inal and t he

IN_COM

term inal. Th is will synchro nize the switch ing power conver ter
althoug h not the feedback oscillator. If it is desired to synchr onize both the power conver ter and
feedback oscillator a low impedance clock waveform, approximately 50% duty cycle, TTL
compatible between 450 and 500KHz, should be applied to the

OUT_COM

The

terminal.

ST ATUS

output is an open collector signal, active low, referenced to

asserted w hen the out put voltage is within ±10% of th e nominal ou t put voltage.

INHIBIT

pin. This pin may be used as both an internal

INHIBIT

INHIBIT

is shorted to the

IN_COM

pin the

line at this time is less th an 1m A,

SYNC_OUT

terminal and the

OUT_COM

that is

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Table 1 – Performanc e Sp ec ific at io ns

(TC = -55°C to +85°C, VIN = +50V DC ±5%, CL = 0, Unless otherwise specif ied)

Parameter ACT8601 ACT8602 ACT8603 ACT8604 ACT8605 Units

Nomin al O utp ut Voltage
Regulation, No Load to Full Load
Stability, Over Operating Temperature
Regulation, Over Line Voltage

Ripple

Output Overvoltage Shutdown
Effice nc y, at Full Load
Output Current
Outpu t Cur rent Lim it
Output Voltage Accuracy
Output Power
Input Voltage
Input Voltage

Input Voltage, Transient

Input EMI

+5 +12 +15 -12 -15 Volts

0.1 0.05 0.05 0.05 0 .05 Volts, Maximum

0.1 0.05 0.05 0.05 0 .05 Volts, Maximum

0.05 0.025 0.02 5 0.025 0.025 Volts, Maximum

50 25 25 25 25

+5.5 +13.2 +16.5 -13.2 -16.5 Volts, Maximum

85 88 88 88 88 %, Minimu m
10 4.2 3.3 4.2 3.3 Amperes, Maximum
125454Amperes, Maximum

±2 %
50 W, Maximum
40 Volts, Minimum
60 Volts, Maximu m

100

Complies with MIL-STD-461C –

mVolts RMS,

Maximum

Volts, Maximum

for 1 second

Input Undervoltage Threshold
Input Current, at Full Load
Input Current, at No Load
Input Current, Shutdown Asserted
Input Outp ut Isolat ion
Switch ing Frequency

Transient Response

Overshoot
Outp u t Short Ci rcuit Durati on

Radiation, Total Dose

Radiation, SEE/S EB

Thermal Shutdown, Case
Operating Temperature, Case
Storage Temperature

38.5 Volts, Maximum

1.5 Amper e s, Maximu m

0.15 Amperes, Maximum
20 mAmperes, Maximum

10MΩ at 250V Minimum –

200 KHz, Nominal

50% loa d change, 5% Maximum deviation, returns to regulation band

At Turn On, Turn Off and Power Failure: None –

Will Withstand co ntinious short without damage –

in 1msec.

100

20

85°C Minimum

-55°C to +85°C –

-65°C to +125°C –

–

KRad (Si),

Maximum

MeV/cm

Maximum

2

/mg,

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4x ∅.171

See
Note 1

(1.852)

A3

A2

10

5
4

9

3

8

2

7

1

6

A1

.91

.61

Table 2 – Connector

Pin Ass ign m e n ts

Pin Function

A1 CHASSIS
A2 VO+

COMMON

4.000

.281

.900

3.438

.50

TYP

.250

.500 TYP

3.500

3.000

3.500

A3 VO-

1VIN­2 SYNC_IN
3NC
4STATUS
5OUT_COM
6VIN+
7 INHIBIT
8 IN_COM
9NC

10 SYNC_OUT

Notes:

1. Input/ Output Connector ITT Cannon DBMMMD13H3PJ, mating
with DBMM13W 3S . Connector pin assignments are listed in Table 1.

2. Dimension Tolerances: 2 Place Decimals . ±.015

3 Place Decimals. ±.005

Figure 2 – Package Outline Drawing

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Ordering Information

Model Number Output Voltage

ACT 8611 +5V
ACT8612 +12V
ACT8613 +15V
ACT8614 -12V
ACT8615 -15V

Specifications subject to change without notice

Aeroflex Circuit Technology
35 South Service Road
Plainview New York 11803
www.aeroflex.com/act1.htm

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