TMC246/A ETC2 [List of Unclassifed Manufacturers], TMC246/A Datasheet - Page 21

• Manufacturer Part Number: TMC246/A
• Description: High Current Microstep Stepper Motor Driver with sensorless stall detection, protection / diagnosis and SPI Interface
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

TMC246 DATA SHEET (V2.01 / Sep. 14th, 2005)
Thermal Characteristics
Typical Power Dissipation at high load / high temperature
Coil:
Chopping with:
Copyright © 2005, TRINAMIC Motion Control GmbH & Co KG
Symbol
Current
both brid-
ges on
560 mA
-
560 mA
1000 mA
-
R
R
R
R
THA12
THA22
THA14
THA24
Parameter
Thermal resistance bridge transistor junction to
ambient, one bridge chopping, fixed polarity
Thermal resistance bridge transistor junction to
ambient, two bridges chopping, fixed polarity
Thermal resistance bridge transistor junction to
ambient, one bridge chopping, fixed polarity
Thermal resistance bridge transistor junction to
ambient, two bridges chopping, fixed polarity
Current
one bridge
on
-
800 mA
800 mA
-
1500 mA
L
t
DUTY
W
= 10mH, R
Ambient
temperature
105 °C
105 °C
125 °C
125 °C
70 °C
70 °C
T
= 33% ON, only slow decay
A
W
= 5.0Ω
Motor supply
voltage
V
16 V
16 V
14 V
14 V
28 V
28 V
M
Slope
t
400 ns
400 ns
60ns
60ns
60ns
60ns
SLP
Conditions
soldered to 2 layer
PCB
soldered to 2 layer
PCB
soldered to 4 layer
PCB (pessimistic)
soldered to 4 layer
PCB (pessimistic)
Chopper
frequency
f
25 KHz
25 KHz
20 KHz
20 KHz
25 KHz
25 KHz
CHOP
Typ total power
dissipation
P
490 mW
450 mW
350 mW
340 mW
1000 mW
1100 mW
D
Typ
88
68
84
51
°K/W
°K/W
°K/W
°K/W
Unit
21