Datasheet GS-R424, GS-R415, GS-R412, GS-R405S, GS-R405 Datasheet (SGS Thomson Microelectronics)
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SWITCHING REGULATOR FAMILY
FEATURES
MTBF in excess of 200,000 hours
4A max output current
46V max input voltage
4V max dro p-o ut vo ltage
Soft start
Remote logic inhibit/enable
Remote output voltage sense
Non-latching overload and short circuit pr otection
Crow-bar outpu t over volta ge prote ct ion
DESCRIPTION
The GS-R400 series is a versati le family of high
current, h igh vo lta ge step-down swi tchin g vo lta ge
regul ators.
The integral heatsink allows a large power handling
capability and it provides also an effective shielding
to minimize EMI.
GS-R400 Family
20W TO 140W STEP-DOWN
SELECTION CHART
Line
(mV/V)
=1 to 3A
Regulation
Load
(mV/A)
Efficiency
Notes
(%)
Fixed output voltage
Reset output
Progr. output voltage
Progr. output voltage and
current. Frequency synchr.
Type
Ordering
Number
GS-R405
GS-R412
GS-R415
GS-R424
GS-R405S
GS-R400V
GS-R400VB
Note: The line regulation is measured at I
The load regulation is measured at Vin=Vo+8V and I
For VO ≥ 36V and Io = 4A an external heatsink or forced ventilation are required.
Output
Voltage
(V)
5.1 ± 2% 9 to 46 25 2 20 70
12.0 ± 4% 16 to 46 50 5 40 80 "
15.0 ± 4% 19 to 46 65 5 60 85 "
24.0 ± 4% 28 to 46 100 6 90 90 "
5.1 ± 2% 9 to 46 25 2 20 70
5.1 to 40 Vo+4 to 46 25 to 100 6 20 to 90 70 to 90
5.1 to 40 Vo+4 to 46 25 to 100 6 20 to 90 70 to 90
Input
Voltage
(V)
out
Output
Ripple
(mVpp)
=1A
out
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
Irt*
T
stg
T
cop
* GS-R405S only
DC Input Voltage
i
Reset Output Sink Current
Storage Temperature Range
Operating Case Temperature Range
48 V
20 mA
– 40 to +105 °C
– 20 to +85 °C
June 1994 1/5
GS-R400 F AMILY
CONNECTION DIAGRAM AND MECHANICAL DATA
Pin 2 GS-R405S only
Pin 5,6,7 GS-R400VB only
Pin 12 GS-R400V/VB only
Dimens io ns in mm
Bottom view
PIN DESCRIPTION
Pin Function Description
Inhibit The module is disabled by a high logic level applied to this pin.
1
Reset Reset output (GS-R405S only).
2
+ Input DC input voltage. Recommended maximum voltage is 46V.
3
Input GND Return for input voltage source.
4
Oscillator
5
Sync Synchronization input. To be connected to the Oscillator output (pin 5) of the master (GS-
6
Current limiting A resistor (≥ 2.2kΩ) connected from this pin to pin 9 sets the current limiting level
7
Output GND Return for output current path.
8
– Sense Senses the remote load return. Mus t be tied to pin 8 when the re mote sensing feature is
9
+ Sense Senses the remote load high side. Must be tied to pin 11 when the remote load sensing
10
+ Output Regulated DC output voltage.
11
Program A resistor (≤ 18kΩ) connected between this pin and pin 10 sets the output voltage
12
100kHz oscillator output. To be connected to Sync (pin 6) input if the unit is a master and
left open if it is a slave (GS-R400VB only). See fig. 5.
R400VB only). See fig. 5.
(GS-R400VB only).
Internally connected to pin 4.
not used. See fig. 1.
feature is not used. See fig. 1.
(GS-R400V and GS-R400VB only).
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GS-R400 F AMILY
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise specified)
Symbol Parameter Test Conditions Min Typ Max Unit
∆Vo/∆T
I
I
isc
SVR
V
t
V
V
inhh
I
inhh
t
Vrh*
V
trd*
V
∆V
R
* GS-R405S only
Temperature Stability Vi = Vo+8V Io = 1A
Output Current Vi = Vo+8V
I
o
Current Limit Vi = Vo+8V
oL
Average Input Current Vi = 46V Output Shorted
Switching Frequency Io = 1A
f
s
Supply Voltage Rejection fo = 100Hz Io =1A
Ripple Voltage Io = 2A
r
Soft Start Time Vi = Vo+8V
ss
Low Inhibit Voltage
inhl
High Inhibit Voltage
High Inhibit Input Current V
Crow-bar Delay Time
cb
Reset High Level
Reset Low Level
*
rl
Reset Delay Time
Crowbar Intervention Threshold
cth
Total Remote
o
Sense Compensation
Thermal Resistance Case to ambient
th
= 5V
inh
Irl = 5mA
Irl = 10mA
0.2/1.6 mv/°C
0.2 4 A
58A
0.1 0.2 A
100 KHz
4/12 mV/V
25/150 mV
10/35 ms
0.8 V
2 5.5 V
500 µA
5 µs
5V
0.2
0.4
100 ms
Vo•1.25 V
500 mV
5 °C/W
pp
V
USER NOTES
Input Voltage
The recommended opera ting maximum DC input
voltage is 46V inclusive of the ripple voltage.
Remote Sensing
The remote volta ge sense compensation range is
for a to ta l dro p o f 500 mV e qual l y shar ed be tw een
the load connecting wires. It is a good practice to
shield the sensing wires to avoid oscillation.
Each sense input must be connected to its companion output power pin when the remote sense capability is not used (see fig. 1).
Case Groundin g
The module case is isolated from the electrical
circuit of the switching regulator. It can be grounded
using the 4 corner pins.
The PCB area below the module can be used as an
effective sixth side shield against EMI.
Thermal Characteristics
The case-to-amb ien t thermal resistance of all the
GS-R400 modu les is about 5°C/W. This prod uces
a 50°C temperature increase of the module surface
for 10W of intern al po wer dis sipat ion .
De pend i ng on the am b ien t tem pe r at ure an d/o r on
the power dissipation, an additional heatsink or
for ced ve ntilation may be requ ired.
Input Impedance
The module has an internal capacitor connected
between the input pins in order to assure PWM
stabilit y. This capacitor cannot han dle large values
of high freq uen cy ripple curre nt and it can b e permanently damaged if the primary energy source
impedance is not adequate. The use of an external
low ESR, high ripple curren t capacitor located as
close the module as possible is recommended.
Suitable capacitors should have a RMS current
capabilit y of 2.5A
and an ESR of 0,1Ω at 100 kHz. When space
V
DC
with a working volta ge of 50
RMS
3/5
GS-R400 F AMILY
is a limita tio n, a 22 µF cera m i c multil ayer capacitor
must be connected to the module input pins.
Output Voltage Programming
The GS-R400V and GS-R400VB o utput voltage is
progra mmed by usin g a resisto r (see pin functi on
table and fig. 4). The resistor must be located very
close the module and the PCB layout must
mimimize injected noise. The value of the resistor
is calculated by using the following formula:
= 2.67
R
v
V
can be adjusted between 5.1 and 40V.
o
5.1
V
o
kΩ
–1
Current Limiting Programmi ng
The GS-R400VB current limiting is programmed by
using a resistor (see pin functio n table and fig. 4).
Figure 1. Load Connection
The value of th e re sistor is calcula te d by using the
following formula:
= [2.2 + (5•Io)] kΩ
R
i
Module Protection
The modules are protected against occasional and
permanent short circuits of the output pin to ground,
as well as against output current overload.
When the output current exceeds the maximum
value, the output is autom atically disabled . After a
fixed time the module starts again in a sof t mode.
The cycle is repeated until the overload condition is
removed.
A c rowbar output overvoltage protection is activated
whenever the output voltage exceeds the nominal
output voltage by more than 25%.
Figure 2. Remote Inhibit Operation Figure 3. Reset Operation
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GS-R400 F AMILY
Figure 4. Voltage and Current Programming Figure 5. Multiple Units Synchronization
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectroni cs a ssumes 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 nent s in l ife s uppo rt de vices o r sy st ems wi thout express
written approval of SGS-THOMSON Microelectronics.
© 1994 SGS-THOMSON Microelectronics – All Rights Reserved
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