Datasheet GS300T48-5 Datasheet (SGS Thomson Microelectronics)

GS300T48-5

300W DC-DC CONVERTER

Type V

GS300T48-5 38 to 60 V 5,075 V 60 A

i

V

o

I

o

FEATURES

Veryhigh output power (300W)
High efficiency(80%min.)
Paralleloperation with current sharing
Synchronizationpin
Remote ON/OFF
Remote loadvoltage sensecompensation
Output short-circuit protection
Output overvoltageprotection
Thermal protection
Undervoltagelock-out
Minimalovershoot duringload transients
500 V

inputto output isolation

DC

Internal inputand output filtering
Softstart
PCB or chassismountable

DESCRIPTION

The GS300T48-5 is a 300W DC-DC converters
used to generate a 5.075V isolated output with a
current of 60A from a widerange input voltage(38
to 60V).

SELECTIONGUIDE

Type

Ordering Number

GS300T48-5

GS300T48-5E

June 1994 1/6

Input

Voltage (V)

38 to 60 5.075 60

Output

Voltage

(V)

Output

Current

(A)

Dimensions

L • W • H mm (inches)

125 • 66.5 • 20

( 4.92 • 2.62 • 0.79)

The suffix E identifies the metric threading

on the planar heatsink (see fig. 1).

GS300T48-5

ELECTRICAL CHARACTERISTICS (T

Symbol

Input Voltage Vo= 5.075V Io= 0 to 30A

V

i

V

l

ipk

V

l

ien

V

V

V

V

V
V

V

∆V

δV

I

I

osc

t

V

R

T

cop

T

* Thermalintervention @ T

Input Undervoltage Lockout Io = 0 to 60A

iuv

AverageInput Current Vi= 48V

l

i

Inrush TransientPeak Current Vi= 60V

Reflected Input Current Vi= 48V Io= 60A

l

ir

Enable Input Voltage Vi= 38 to 60V Io= 0 to 60A

ien

Enable Input Current Vi= 38 to 60V Io= 0 to 60A

Max Inhibit Voltage Vi= 38 to 60V Io= 0 to 60A

iinh

Input Power Vi= 38 to 60V Io= 0A(No Load)

P

i

TotalOutput VoltageRegulation Vi= 38 to 60V Io= 0 to 60A

o

Short-term Output

ost

VoltageRegulation
TotalStatic Output

ots

VoltageRegulation
Output Overvoltage Limit Initiation Vi= 38 to 60V Io= 0 to 60A

ol

Output Ripple Voltage Vi= 38 to 60V Io= 60A

or

Output Noise Voltage Vi= 38 to 60V Io= 60A

on

TotalRemote Sense

o

Compensation
Peak Load Transient Response Vi= 48V δIo= 10A

o

Output Current Vi= 38 to 60V Vo=5V

I

o

OvercurrentLimit Initiation Vi= 48V

ol

Shortcircuit Output Current Vi= 48V
Load Transient Setting Time Vi= 48V δIo= 10A

t

s

Turn-onTime Vi= 38 to 60V Io= 0 to 60A

on

IsolationVoltage

is

Switching Frequency Vi= 38 to 60V Io= 0 to 60A

f

s

Efficiency Vi= 38 to 60V Io= 60A

η

Thermal Resistance Case toAmbient

th

Operating Case
TemperatureRange*

Storage TemperatureRange

stg

Parameter Test Conditions Min Typ Max Unit

=85°C

cop

=25°C unless otherwisespecified)

amb

(Operating Conditions)

Io= 60A

Io= 60A

BW = 5Hz to 20MHz (see fig. 2)

V

=0V

ien

Vien= open

Vi= 38 to 60V Io= 0 to 60A

Vi= 38 to 60V Io= 0 to 60A

BW = 0 to 20 Mhz

BW = 0 to 20 Mhz
Vi= 38 to 60V

slope = 0.1A/µs

slope = 0.1A/µs

V

= from high to low

ien

Vi= 0 to 60V Io= 0 to 60A
V

= low

ien

38 48 60 V

DC

29 36 V

7.8 A

2

0.3 A

s

30 mApp

0 1.2 V

–1 mA

818V

1.5 2 W

4.490 5.075 5.210 V

5.002 5.075 5.148 V

4.970 5.075 5.180 V

6.3 V
50 mVpp

100 mVpp

0.6 V

100 mVp

060A

63 A
69 A

250 µs

10 ms

10

500 V
160 180 200 kHz

80 81 %

5.2 °C/W

0 +70 °C

– 40 +105 °C

2/6

CONNECTION DIAGRAM AND MECHANICAL DATA
Figure1.

GS300T48-5

PackageU. Dimensions in mm (inches)

PIN DESCRIPTION

Pin Function Description

1,2 - Vin
3,4 + Vin

5 SYNC
6 PARALLEL
7 ON/OFF

8 CASE
9 + SENSE

10 - SENSE

11,12,

13,14

15,16,

17

- OUT

+ OUT

Negativeinput voltage.
Positive input voltage. Unregulated input voltage (typically 48V) must beapplied between

pin 1,2-3,4.
Synchronization pin. See figures 3, 4, 5, 6. Open when not used.
Parallel output. See figures 3, 4, 5, 6. Open when not used.
The converteris ON (Enable) when the voltage applied to this pin with reference to pin 1,2

is lowerthan 1,2 V (see Vien).The converter is OFF (Inhibit) for a control voltage in the
rangeof 8 to18V.
When the pin is unconnected the converter is OFF (Inhibit).

Case connection pin
Senses the remote load high side.To be connected to pin 15,16,17 when remote sense is

notused.
Senses the remote load return. Tobe connected to pin 11,12,13,14 when remote senseis

notused. In parallel configuration, take care to connect all -SENSE pins together (see
figures 3,4,5,6).

-5Vvoltage return.

+5V output voltage.

3/6

GS300T48-5

USER NOTES
Reflected Input Current

The reflectedinput current measurement (lir, see ElectricalCharacteristics)is performedaccording to the
test set-upof fig. 2.

Figure2.

Softstart

To avoid heavy inrush current the output voltage
risetimeis 10ms maximumin anyconditionofload.

Remote Sensing

The remote voltage sense compensation range is
for a totaldrop of 0.6Vequally shared betweenthe
load connectingwires.

It is a good practice to shieldthe sensingwires to
avoid oscillations.

See the connectiondiagramon figures 3, 4, 5, 6.

Remote ON/OFF

The module is controlled by the voltage applied
betweenthe ON/OFF pin and -IN pin.

The converter is ON (Enable) when the voltage
appliedis lower than 1.2 V (see Vien on Electrical
Characteristics).

The converteris OFF(Inhibit) for a control voltage
in the range of 8 to 18V (seeViinh).

4/6

When thepin is unconnectedthe converteris OFF.
Maximum sinkingcurrentis 1mA.

Module Protection

The module is protected against occasional and
permanent shortcircuits of the output pins to
ground, aswell asagainst outputcurrentoverload.
It uses a current limiting protection circuitry,avoid­ing latch-upproblems with certaintype of loads.

A latchingcrowbar output overvoltageprotection is
activated when the output voltage exceeds the
typical value of 6.3V (see Electrical Charac­teristics).Athermalnon-latchingprotectiondisables
the module whenever the heatsink temperature
reachesabout 85°C.

Parallel Operation

To increase available output regulated power, the
module features the parallel connection possibility
with equalcurrent sharingand maximum deviation
of 10% (two modules in parallel).

See the connectiondiagramon figures3, 4, 5, 6.

Figure3. Figure 4.

GS300T48-5

Figure 5.

Thermal Characteristics

The case-to-ambient thermal resistance of the
GS300T48-5module is 5.2°C/W typical. It may be
decreased, improving the convection cooling, by
mountingan externalheatsink tothe top of the unit
heatsink(fig. 9).

Figure 6.

Six threadedholes, # 4-40UNC on the standard or
# M3onthe Eversion,5mm(0,2”) maximum deep,
are providedfor this purpose (see fig.1).

5/6

GS300T48-5

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences ofuse of such information nor for anyinfringement of patents or other rights of third parties which may result from its use. No
licenseis granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are notauthorized foruse as critical components in life support devices or systemswithout express
written approval of SGS-THOMSON Microelectronics.

 1994 SGS-THOMSON Microelectronics –All Rights Reserved

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