Datasheet GS-R415-2, GS-R412-2, GS-R405-2, GS-R424-2, GS-R400V-2 Datasheet (SGS Thomson Microelectronics)

SWITCHING REGULATOR FAMILY

FEATURES

MTBF in excess of 500,000 hours
4A max output current
40V max input voltage
4V max dro p-o ut vo ltage
Soft start
Non-latching short circuit protection
Crow-bar outpu t over volta ge prote ct ion

DESCRIPTION

The GS-R400/2 series is a family of small sized
high current, high voltage step-down switching
regulators.

The integral heatsink allows a large power handling
capability and it provides also an effective shielding
to minimize EMI.

GS-R400/2 Family

SMALL SIZE STEP-DOWN

SELECTION CHART

Type

Ordering

Number

GS-R405/2
GS-R412/2
GS-R415/2
GS-R424/2
GS-R400V/2

Note : Line regulation is measured at I

Load regulation is measured at Vin=Vo+8V and I
Case temperature must be kept below 85° C

Output

Voltage

(V)

5.1 ± 2%

12.0 ± 4%

15.0 ± 4%

24.0 ± 4%

5.1 to 24

9 to 40
16 to 40
19 to 40
28 to 40
V o+4 to 40

Input

Voltage

(V)

=1A.

out

Output

Ripple

(mVpp)

25 2 20 80
50 5 40 85 "
65 6 60 87 "

100 6 80 90 "

25 to 100 2 to 6 20 to 80 80 to 90

=0.5 to 1.5A.

out

Regulation

Line

(mV/V)

Load

(mV/A)

Efficiency

Notes

(%)

Fixed output voltage

Progr. output voltage

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

DC Input Voltage

V

i

Output Current

I

o

T

T

cop

Storage Temperature Range

stg

Operating Case Temperature Range

42 V

4A
– 40 to +105 °C
– 20 to +85 °C

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GS- R4 0 0/2 F A M I LY

CONNECTION DIAGRAM AND MECHANICAL DATA

Dimensions in mm Bottom view

Pin 5 GS-R400V/2 only

PIN DESCRIPTION

Pin Function Description

+ Input DC input voltage. Recommended maximum voltage is 40V.

1

Input GND Return for input voltage source.

2

Output GND Return for output c urrent path. Internally connected to pin 2.

3

+ Output Regulated DC output voltage.

4

Program A resistor (<10kΩ) connected between this pin and pin 4 sets the + output voltage of the

5

GS-R400V/2.

ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise specified)

Symbol Parameter Test Conditions Min Typ Max Unit

∆Vo/∆T

I

I

S

t

t

V

R

Temperature Stability Vi = Vo+8V Io = 1A
Output Current Vi = Vo+8V

I

o

Current Limit Vi = Vo+8V

oL

Average Input Current Vi = 40V Output Shorted

isc

Switching Frequency Io = 1A

f

s

Supply Voltage Rejection fo = 100Hz Io = 1A

VR

Ripple Voltage Io = 1A

V

r

Soft Start Time

ss

Crowbar Delay Time

cb

Crowbar Intervention Threshold

cth

Thermal Resistance Case to ambient

th

0.2/0.6 mV/°C

0.1 4 A
58A

0.1 0.2 A
100 kHz

4/12 mV/V

25/100 mVpp

10/35 ms

5 µs

Vo•1.25 V

8 °C/W

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GS- R4 0 0/2 F A M I LY

USER NOTES
Input Voltage

The recommended operating maximum DC input
voltage is 40V inclusive of the ripp le voltage.

Case Grounding

The m odule ca se is intern ally con nected t o pin 2
and pin 3.
The PCB area below the module can be used as an
effective sixth side shield against EMI.

Thermal Characteristics

The case -to-ambient thermal resistance of all the
GS-R400/2 modules is about 8°C/W. This produces
a 32°C temperature increase of the module surface
for 4W of internal po wer di ssipat ion .
Dependin g on the am bient tempera ture a nd/or o n
the power dissipation, an additional heatsink or
forced ventilation may be required.

Input Impedance

The modu le has an interna l capacitor connected
between the input pins in order to assure PWM
stability. This capacitor cannot hand le large value s
of high fre quen cy ripple curren t and it can be per­manently damaged if the primary energy source
impedance is not adequate.
The use of an external low ESR, high ripple current
capa citor lo cated as cl ose the m odule as possib le
is recommende d.
Suitable capacitors should have a RMS current
capability of 2.5 A

and an ESR of 0,1Ω at 100kHz. When space

V

DC

with a working voltage of 50

RMS

is a limitation a 22µF ce rami c mult ila yer ca pa citor
must be connected to the module input pins.

and the PCB layou t must minimize in jected noise.
The value of th e re sistor is calcula te d by using the
following formula:

= 2.67

R

v





V

5.1



o

− 1

kΩ




Vo can be adjusted betwee n 5.1 and 24V.

Module Protection

The modules are protected against occasional and
permanent short circuits of the output pins to
ground. Du ring short ci rcuit (when th e output cur­rent exceeds the maximum value) the output is
automatically disabled. After a fixed time the module
starts again in a soft mode. The cycle is repeated
until the shor t circuit condition is removed.

The module can be permanently damaged if the
case temperature exceeds 85° C

Power Derating Curve

Output Voltage Programming

The GS-R400V/2 output voltage is programmed by
using a resistor.
The resistor must be located very close the module

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectroni cs assumes no respons ibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is 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 Microelect ronics produ cts a re no t a utho rized f or u se as critical c ompo nents in l ife s uppo rt de vices o r sy st ems wi thout expres s
written approval of SGS-THOMSON Microelectronics.

© 1994 SGS-THOMSON Microelectronics – All Rights Reserved

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