TMC-IDX TRINAMIC, TMC-IDX Datasheet - Page 9

• Manufacturer Part Number: TMC-IDX
• Description: DRIVE, STEPPER MOTOR, 3.5A
• Manufacturer: TRINAMIC

Specifications of TMC-IDX

• Supply Voltage Range: 12VDC To 48VDC
• Output Current: 3.5A
• Current Limit Max: 5A
• External Depth: 23mm
• External Length / Height: 63mm
• External Width: 63mm
• Load Current: 3.5A
• No. Of Output Channels: 2
• Supply: RoHS Compliant
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes

4.1 Practical maximum motor current ratings
The IDX 7505 (IDX 4803) uses eight high power 80V (60V) transistors with low internal on resistance
of only 15mOhm (24mOhm) to drive the motor. Due to this, power loss is just a few watts at maximum
current. In order to avoid EMV problems and to keep electromagnetic emission low, the transistors are
switched smoothly on and off with 300ns transitions. On the other hand, this produces dynamic losses
and thus additional power dissipation. The resulting power dissipation has to be cooled away by air
convection and via the metal base plate, in order to keep transistor and board temperature well below
125°C (Integrated thermal limit). This especially becomes a limiting point for the IDX7505, because of
its high voltage capability. The following table gives some examples for the current capability in a
typical mounting situation, where the module is mounted to a metal base plate (heat sink with fins,
overall dimensions 100*50*15mm³). In this situation the base plate was always kept at maximum
60°C. However, the actual motor type and velocity setting also influences power dissipation of the
module.
*) This limit is due to the higher current ripple in chopper mode 2, which allows a maximum of 75% to
90% of the maximum current setting. It is not a thermal limit.
Copyright © 2005, TRINAMIC Motion Control GmbH & Co. KG
Chopper
mode
0, 1
0, 1
0, 1
0, 1
2
Table 4.2.1: Practical motor current limitations for IDX 7505
15V … 75V
voltage
Supply
≤50V
75V
70V
60V
for continuous operation
Maximum
I
COIL
4A *)
3.5A
4.5A
4A
5A
RMS
duty cycle for
full current
Maximum
100%
50%
60%
80%
n/a