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PDF GS-R1012 Data sheet ( Hoja de datos )
| Número de pieza | GS-R1012 | |
| Descripción | 120W STEP-DOWN SWITCHING REGULATOR | |
| Fabricantes | STMicroelectronics | |
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GS-R1012
120W STEP-DOWN SWITCHING REGULATOR
Type
GS-R1012
Vi
18 to 36 V
Vo
12 V
Io
10 A
FEATURES
Wide input voltage range (18 to 36V)
High efficiency (90% 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-R1012 is a step-down switching voltage
regulator suitable to provide 12V/10A output volt-
age from a wide input voltage range (18 to 36V).
ABSOLUTE MAXIMUM RATINGS
Symbol
Vi
Viinh
Tstg
Tcop
Parameter
DC Input Voltage
High Inhibit voltage
Storage Temperature Range
Operating Case Temperature Range
Value
40
28
– 20 to +105
0 to +75
Unit
V
V
°C
°C
June 1994
1/7
1 page  
Figure 3.
Figure 4.
GS-R1012
Thermal characterist ics: how to choose the
heat-sink
Sometimes the GS-R1012 requires an external
heat-sink depending both operating temperature
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-R1012 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 to which the mod-
ule provides 10A is 75°C (see fig. 6).
Let’s suppose to have a GS-R1012 that delivers a
load current of 10A at an ambient temperature of
40°C.
The dissipated power in this operating condition is
about 10.4W (at typical efficiency of 92%), and the
case temperature of the module will be:
TCase = TAmb + Pd × Rth = 40 + 10.4 × 7.5 = 118°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 = 3.37°C / W
Pd 10.4
This value is the resulting value of the additional
heatsink thermal resistance.
5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet GS-R1012.PDF ] | |
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