BTM-055-20 Finisar Corporation., BTM-055-20 Datasheet - Page 12

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

AMPLIFIER TEMPERATURE VS OUTPUT CURRENT AND HV AT 25C AMBIENT
The curves below use the amplifier power dissipation information and the thermal resistance of 12 ºC/W without any heatsink or
forced-air cooling to show quickly if a heatsink or forced-air cooling will be required.
When output current is known, draw a vertical line to the curve of the supply voltage (HV) that’s closes to the HV in use and
mark the spot where they intersect. if the point is above the 70C line on the chart, then either a heatsink or forced-air cooling
will be required. if this is the case, then use the following curves for power dissipation and thermal resistance to determine what
combination of heatsinking and/or cooling would be required.
BTM-055-20
HEATSINK AND FORCED-AIR COOLING: HOW TO FIND OUT IF THESE ARE REQUIRED
To see if a heatsink or fan-cooling is required, find the temperature rise the drive will experience when it’s installed. For example,
if the ambient temperature in the drive enclosure is 40 °C, and the heatplate temperature is to be limited to 70° C or less to
avoid shutdown, the maximum rise would be 70C - 40C. or 30C. Then find the power dissipation in the charts below. Divide the
temperature rise by the power dissipation and the result is thermal resistance in ºC/W. Find this value on the Y-axis of the charts on
the following page and draw horizontal lines across the charts to show what combinations of heatsink and air movement will produce
this thermal resistance.
POWER DISSIPATION VS. OUTPUT CURRENT AND HV
BTM-055-20
Copley Controls, 20 Dan Road, Canton, MA 02021, USA
Web: www.copleycontrols.com
10
8
6
4
2
0
150
120
90
60
30
0
0
2
2
Output Current (A)
Output Current (A)
70
4
4
6
Bantam
6
7 Adc
8
8
+HV (VDC)
10
20
55
36
+HV (VDC)
10
48 vdc
55
36
20
BTM-090-10
6
5
4
3
2
1
0
Trapezoidal Torque
Amplifier Module
BTM-090-10
0
Tel: [phone]
100
80
60
40
20
1
Output Current (A)
0
2
1
Output Current (A)
3
2
70
4
3
Fax: [phone]
RoHS
+HV (VDC)
4
5
Page 12 of 18
90
20
55
+HV (VDC)
5
20
90
55