GS-R51212S STMicroelectronics, GS-R51212S Datasheet - Page 8

• Manufacturer Part Number: GS-R51212S
• Description: Switching Converters, Regulators & Controllers +5.1/+12/-12V Stp-Dn
• Manufacturer: STMicroelectronics
• Type: Step Downr

Specifications of GS-R51212S

• Input Voltage: 15 to 40V
• Screening Level: Commercial
• Operating Temperature Min Deg. C: 0C
• Operating Temperature Max Deg. C: 85C
• Product Depth (mm): 50.8mm
• Mounting Style: Screw
• Pin Count: 11
• Number Of Outputs: 3
• Package / Case: Module
• Lead Free Status / RoHS Status: Supplier Unconfirmed

The dissipated power in this operating condition is
about 7.4W (at typical efficiency of 81%), and the
case temperature of the module will be:
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:
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility 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 Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
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GS-R51212S/GS-R51515S
R
T
Australia - Brazil - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
th
case
T
T
case
amb
max
P
P
d
d
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
T
R
amb
th
40
85
© 1994 SGS-THOMSON Microelectronics – All Rights Reserved
7.4
SGS-THOMSON Microelectronics GROUP OF COMPANIES
7.4
40
7.5
5.40 C W
95.5 C
This value is the resulting value of the parallel
connection of GS-R thermal resistance and of the
additional heatsink thermal resistance.
To calculate the thermal resistance of the additional
heat-sink the following equation may be used:
In instead of or in addition to the external heatsink,
a forced ventilation with an air speed of about 200
linear feet/minute can be used reducing the thermal
resistance of the module at the specified value.
R
th
Heatsink
R
R
th
th
GSR
GSR
5.40
R
th GSR
R
R
th
R
th
th
Heatsink
5,40
Heatsink
GSR
5.40
7.5
5.40
5.40 C / W
7.5
19.3 C / W