BTM-055-20 Finisar Corporation., BTM-055-20 Datasheet - Page 6

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

CURRenT LiMiT inPUTS
Two inputs are provided for setting the peak and continuous current limits. The i-Peak and i-Cont inputs each have equivalent
circuits shown below. Limits can be set either by applying a voltage (Vset) to the input or by connecting a resistor (Rset) between
input and signal ground. The tables below show values for Rset and Vset that give 10~100% of the rated peak and continuous
current ratings.
amplifier models and ratings
peak current limit settings
To use the table, find the % value
as follows:
% = PeakLimitCurrent * 100
continuous current limit settings
To use the table, find the % value
as follows:
% = ContLimitCurrent * 100
Copley Controls, 20 Dan Road, Canton, MA 02021, USA
Web: www.copleycontrols.com
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
%
%
AmpPeak Current
AmpContCurrent
Vpeak
Vcont
4.80
4.32
3.84
3.36
2.88
1.92
1.44
0.96
0.48
4.87
4.38
3.90
3.41
2.92
2.44
1.95
1.46
0.97
0.49
2.4
<OUT>
<OUT>
Rpeak
86400
38400
22400
14400
88189
39195
22864
14698
Rcont
9600
6400
4114
2400
1067
9799
6533
4199
2450
1089
Bantam
Vcont
Vpeak
Rcont
Rpeak
BTM-055-20
BTM-090-10
equivalent circuit
equivalent circuit
Model
J1-6
J1-4
+4.87 V
Control
+4.80 V
Control
Icont
Ipeak
i-Peak
9799
9600
20
10
Vpeak
Vcont
i-Cont
10
5
Trapezoidal Torque
Amplifier Module
T-Peak
Tel: [phone]
1
example i-peak setting
if a voltage Vpeak is used to control the peak-
Vpeak = 4.80 * PeakLimitCurrent
Example: find Vpeak for a 6 A PeakLimitCurrent
Vpeak = 4.80 * 6 = 1.44 V
To use a resistor for setting Peak-Limit current,
Rpeak =
Example: find Rpeak for a 14 A PeakLimitCurrent:
Rpeak =
example icont setting
if a voltage Vcont is used to control the peak-limit
Vpeak = 4.80 * ContLimitCurrent
Example: find Vcont for a 3 A ContLimitCurrent
Vpeak = 4.87 * 3 = 2.92 V
To use a resistor for setting Cont-Limit current,
Rpeak =
Example: find Rcont for a 2 A ContLimitCurrent:
Rpeak =
limit current, it can be found like this:
using a BTM-090-20:
calculate the value as follows:
current, it can be found like this:
using a BTM-090-10:
calculate the value as follows:
400
100
i2T
(AmpPeakCurrent - PeakLimitCurrent)
(AmpContCurrent - ContLimitCurrent)
20
5
9600 * PeakLimitCurrent
9600 * 14
9799 * ContLimitCurrent
9799 * 2
(20 - 14)
(5 - 2)
AmpPeakCurrent
AmpContCurrent
= 6,533 ohms
= 22,400 ohms
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RoHS
Page 6 of 18