TMC246_06 Datasheet, PDF (23/26 Pages) List of Unclassifed Manufacturers – High Current Microstep Stepper Motor Driver with sensorless stall detection, protection / diagnosis and SPI Interface

TMC246 / TMC246A DATA SHEET (V2.03 / Nov. 6th, 2006)
23
Thermal Characteristics
Symbol Parameter
R_THA12 Thermal resistance bridge transistor junction to
ambient, one bridge chopping, fixed polarity
R_THA22 Thermal resistance bridge transistor junction to
ambient, two bridges chopping, fixed polarity
R_THA14 Thermal resistance bridge transistor junction to
ambient, one bridge chopping, fixed polarity
R_THA24 Thermal resistance bridge transistor junction to
ambient, two bridges chopping, fixed polarity
Conditions
Typ Unit
soldered to 2 layer 88 °K/W
PCB
soldered to 2 layer 68 °K/W
PCB
soldered to 4 layer 84 °K/W
PCB (pessimistic)
soldered to 4 layer 51 °K/W
PCB (pessimistic)
Typical Power Dissipation at high load / high temperature
Coil:
Chopping with:
L_W = 10mH, R_W = 5.0Ω
t_DUTY = 33% ON, only slow decay
Current Current
Ambient
both brid- one bridge ^temperature
ges on on
T_A
560 mA -
105 °C
-
800 mA
105 °C
560 mA
125 °C
800 mA
125 °C
1000 mA -
70 °C
-
1500 mA 70 °C
Motor supply Slope
voltage
t_SLP
V_M
16 V
400 ns
16 V
400 ns
14 V
60ns
14 V
60ns
28 V
60ns
28 V
60ns
Chopper
frequency
f_CHOP
25 KHz
25 KHz
20 KHz
20 KHz
25 KHz
25 KHz
Typ total power
dissipation
P_D
490 mW
450 mW
350 mW
340 mW
1000 mW
1100 mW
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