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PDF GS-R1005 Data sheet ( Hoja de datos )
| Número de pieza | GS-R1005 | |
| Descripción | 50W STEP-DOWN SWITCHING REGULATOR | |
| Fabricantes | STMicroelectronics | |
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GS-R1005
50W STEP-DOWN SWITCHING REGULATOR
Type
GS-R1005
Vi Vo Io
12 to 36 V 5 V 10 A
FEATURES
Wide input voltage range (12 to 36V)
High efficiency (80% min.)
Parallel operation with current sharing
Synchronization
Remote inhibit/enable
Remote load voltage sense
Output short-circuit protection
Soft-start
PCB or chassis mountable
DESCRIPTION
The GS-R1005 is a step-down switching voltage
regulator suitable to provide 5V/10Aoutput voltage
from a wide input voltage range (12 to 36V).
ABSOLUTE MAXIMUM RATINGS
Symbol
Vi
Viinh
Tcop
Tstg
Parameter
DC Input Voltage
High Inhibit voltage
Operating Case Temperature Range
Storage Temperature Range
Value
40
28
0 to +75
– 20 to +105
Unit
V
V
°C
°C
June 1994
1/7
1 page  
Figure 3.
Figure 4.
GS-R1005
Thermal characterist ics: how to choose the
heat-sink
Sometimes the GS-R1005 requires an external
heat-sink dependingon both operatingtemperature
conditions and power.
Before entering into calculations details, some ba-
sic concepts will be explained to better understand
the problem.
The thermal resistance between two points is rep-
resented by their temperature difference in front of
a specified dissipated power, and it is expressed in
Degree Centigrade per Watt (°C/W).
For GS-R1005 the thermal resistance case to am-
bient is 7.5°C/W. This means that an internal power
dissipation of 1W will bring the case temperature at
7.5°C above the ambient temperature.
The maximum case temperature, at which the mod-
ule provides 10A, is 75°C (see fig. 6).
Let’s suppose to have a GS-R1005 that delivers a
load current of 10A at an ambient temperature of
40°C.
The dissipated power in this operating condition is
about 10.2W (at typical efficiency of 83%), and the
case temperature of the module will be:
TCase = TAmb + Pd × Rth = 40 + 10.2 × 7.5 = 116.8 °C
This value exceeds the maximum allowed tempera-
ture and an external heat-sink must be added. To
this purpose four holes (see mechanical drawing)
are provided on the metal surface of the module.
To calculate this heat-sink, let’s first determine what
the total thermal resistance should be.
Rth = TCaseMAX − Tamb = 75 − 40 = 3.42°C / W
Pd 10.2
This value is the resulting value of the additional
heatsink thermal resistance.
5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet GS-R1005.PDF ] | |
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