Datasheet

TMC246 DATA SHEET (V2.02 / Jul. 31st, 2006) 23
Copyright © 2005, TRINAMIC Motion Control GmbH & Co KG
Thermal Characteristics
Symbol Parameter Conditions Typ Unit
R
THA12
Thermal resistance bridge transistor junction to
ambient, one bridge chopping, fixed polarity
soldered to 2 layer
PCB
88 °K/W
R
THA22
Thermal resistance bridge transistor junction to
ambient, two bridges chopping, fixed polarity
soldered to 2 layer
PCB
68 °K/W
R
THA14
Thermal resistance bridge transistor junction to
ambient, one bridge chopping, fixed polarity
soldered to 4 layer
PCB (pessimistic)
84 °K/W
R
THA24
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: L
W
= 10mH, R
W
= 5.0Ω
Chopping with: t
DUTY
= 33% ON, only slow decay
Current
both brid-
ges on
Current
one bridge
on
Ambient
temperature
T
A
Motor supply
voltage
V
M
Slope
t
SLP
Chopper
frequency
f
CHOP
Typ total power
dissipation
P
D
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