BTM-055-20 Finisar Corporation., BTM-055-20 Datasheet - Page 13

• Manufacturer Part Number: BTM-055-20
• Description: Rohs Bantam Trapezoidal Torque Amplifer Module
• Manufacturer: Finisar Corporation.

THERMAL RESISTANCE
The temperature rise of the amplifier when operating depends on the power dissipation and the thermal resistance between the amplifier
and the environment.
NO HEATSINK
exAMPLe
A BTM-055-20 application needs to output 7 Adc while operating from a 48 V power supply. in the chart on p. 10, place a vertical line
at the 7 Adc point. Next draw a horizontal line that intersects it at a point 2/3 of the way between the 36 & 55 V curves, estimating
a 48 Vdc power supply. This line yields a power dissipation of 5.4 W. Next, draw lines at the 5.4 ºC/W point on the curves above.
These show that adding a heatsink reduces the air circulation requirement from 250 lfm to ~25 lfm. This low value can probably be met
using a single fan in the enclosure to circulate air where it could cool multiple Bantam amplifiers adequately.
HEATSINK INSTALLATION
if a heatsink is used it is mounted using the same type of screws used to mount the drive without a heatsink but slightly longer. Phase
change material (PSM) is used in place of thermal grease. This material comes in sheet form and changes from solid to liquid form as
the drive warms up. This forms an excellent thermal path from drive heatplate to heatsink for optimum heat transfer.
STePS To inSTALL
1. Remove the PSM (Phase Change Material)
from the clear plastic carrier.
2. Place the PSM on the Bantam aluminum
heatplate taking care to center the PSM
holes over the holes in the drive body.
3. Mount the heatsink onto the PSM again
taking care to see that the holes in the
heatsink, PSM, and drive all line up.
4. Torque the #4-40 mounting screws to
8~10 lb-in (0.9~1.13 N·m).
Copley Controls, 20 Dan Road, Canton, MA 02021, USA
Web: www.copleycontrols.com
12
10
8
6
4
2
0
100
Air Flow (linear feet/min)
200
250 lfm
Bantam
300
5.4 ºC/W
400
500
Phase Change Material
Transparent Carrier
(Discard)
10
Trapezoidal Torque
Amplifier Module
8
6
4
2
0
WITH HEATSINK
0
Tel: [phone]
20
22 lfm
Air Flow (linear feet/min)
40
5.4 ºC/W
60
80
100
Fax: [phone]
RoHS
150
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