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GS-R405-GS-R405S-GS-R424
20 W TO 140 W STEP-DOWN SWITCHING REGULATOR FAMILY
20W TO 140W STEP-DOWN
SWITCHING REGULATOR FAMILY
June 1994 1/5
FEATURESMTBF in excess of 200,000 hours
4A max output current
46V max input voltage
4V max drop-out voltage
Soft start
Remote logic inhibit/enable
Remote output voltage sense
Non-latching overload and short circuit protection
Crow-bar output overvoltage protection
DESCRIPTIONThe GS-R400 series is a versatile family of high
current, high voltage step-down switching voltage
regulators.
The integral heatsink allows a large power handling
capability and it provides also an effective shielding
to minimize EMI.
SELECTION CHART
Note: The line regulation is measured at Iout=1A
The load regulation is measured at Vin=Vo+8V and Iout=1 to 3A
For VO ≥ 36V and Io = 4A an external heatsink or forced ventilation are required.
ABSOLUTE MAXIMUM RATINGS* GS-R405S only
CONNECTION DIAGRAM AND MECHANICAL DATA
PIN DESCRIPTION
GS-R400 FAMILY
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise specified)* GS-R405S only
USER NOTES
Input VoltageThe recommended operating maximum DC input
voltage is 46V inclusive of the ripple voltage.
Remote SensingThe remote voltage sense compensation range is
for a total drop of 500mV equally shared between
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 compan-
ion output power pin when the remote sense capa-
bility is not used (see fig. 1).
Case GroundingThe 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 CharacteristicsThe case-to-ambient thermal resistance of all the
GS-R400 modules is about 5°C/W. This produces
a 50°C temperature increase of the module surface
for 10W of internal power dissipation.
Depending on the ambient temperature and/or on
the power dissipation, an additional heatsink or
forced ventilation may be required.
Input ImpedanceThe module has an internal capacitor connected
between the input pins in order to assure PWM
stability. This capacitor cannot handle large values
of high frequency ripple current and it can be per-
manently damaged if the primary energy source
impedance is not adequate. The use of an external
low ESR, high ripple current capacitor located as
close the module as possible is recommended.
Suitable capacitors should have a RMS current
capability of 2.5ARMS with a working voltage of 50
VDC and an ESR of 0,1Ω at 100 kHz. When space
GS-R400 FAMILY
is a limitation, a 22μF ceramic multilayer capacitor
must be connected to the module input pins.
Output Voltage ProgrammingThe GS-R400V and GS-R400VB output voltage is
programmed by using a resistor (see pin function
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:
Rv = 2.67
Vo
5.1 –1
kΩ
Vo can be adjusted between 5.1 and 40V.
Current Limiting ProgrammingThe GS-R400VB current limiting is programmed by
using a resistor (see pin function table and fig. 4).
The value of the resistor is calculated by using the
following formula:
Ri = [2.2 + (5•Io)] kΩ
Module ProtectionThe 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 automatically disabled. After a
fixed time the module starts again in a soft mode.
The cycle is repeated until the overload condition is
removed.
A crowbar output overvoltage protection is activated
whenever the output voltage exceeds the nominal
output voltage by more than 25%.
Figure 1. Load Connection
Figure 2. Remote Inhibit Operation Figure 3. Reset Operation
GS-R400 FAMILY
Figure 4. Voltage and Current Programming Figure 5. Multiple Units Synchronization. However, SGS-THOMSON Microelectronics assumes no responsibility for the
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 Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
© 1994 SGS-THOMSON Microelectronics – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
GS-R400 FAMILY
:
www.ic-phoenix.com
.
