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TMC246 DATA SHEET (V2.01 / Sep. 14th, 2005)
21
Copyright © 2005, TRINAMIC Motion Control GmbH & Co KG
Thermal Characteristics
Symbol
Parameter
Conditions
Typ
Unit
RTHA12
Thermal resistance bridge transistor junction to
ambient, one bridge chopping, fixed polarity
soldered to 2 layer
PCB
88
°K/W
RTHA22
Thermal resistance bridge transistor junction to
ambient, two bridges chopping, fixed polarity
soldered to 2 layer
PCB
68
°K/W
RTHA14
Thermal resistance bridge transistor junction to
ambient, one bridge chopping, fixed polarity
soldered to 4 layer
PCB (pessimistic)
84
°K/W
RTHA24
Thermal resistance bridge transistor junction to
ambient, two bridges chopping, fixed polarity
soldered to 4 layer
PCB (pessimistic)
51
°K/W
Typical Power Dissipation at high load / high temperature
Coil:
LW = 10mH, RW = 5.0Ω
Chopping with:
tDUTY = 33% ON, only slow decay
Current
both brid-
ges on
Current
one bridge
on
Ambient
temperature
TA
Motor supply
voltage
VM
Slope
tSLP
Chopper
frequency
fCHOP
Typ total power
dissipation
PD
560 mA
-
105 °C
16 V
400 ns
25 KHz
490 mW
-
800 mA
105 °C
16 V
400 ns
25 KHz
450 mW
560 mA
125 °C
14 V
60ns
20 KHz
350 mW
800 mA
125 °C
14 V
60ns
20 KHz
340 mW
1000 mA
-
70 °C
28 V
60ns
25 KHz
1000 mW
-
1500 mA
70 °C
28 V
60ns
25 KHz
1100 mW
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