Datasheet

TMCC160 motionCookie™ (Rev. 1.00 / 2015-Nov-16)
© 2015 TRINAMIC Motion Control GmbH & Co. KG, Hamburg, Germany
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4.5 Power MOSFET Bridge
TMCC160 provides a powerful gate driver for a three phase bridge using N-channel MOSFETs only.
The system is capable to drive MOSFETs with up to 350nC gate charge. The gates of the MOSFETs
will be charged with a current of ±1A. This helps to reduce dynamic losses and to building high
efficient systems in a wide power range.
A power MOSFET schematic including two phase direct coil current amplifier
(e.g. AD8418) is shown below. The coil current measurement amplifiers can be
powered by the 3.3V supply of the TMCC160.
NOTE:
→ Integrate coil current amplifiers in motor coil connection U and V.
C1
C2
C3
C4
C5
C6
HS1 HS2 HS3
LS1 LS2 LS3
VM
BM3
BM2
BM1
R
R
W
I_U
BLDC
V
U
+
-
I_V
+
-
Figure 9: Direct Coil Current Measurement Schematic
i Direct coil current measurement is recommended for field oriented control
(FOC) in hall- or encoder mode. It can also be used in block hall commutation
(six step mode).
NOTE:
→ Please note that the current amplifier has to be configured for bidirectional
measurement. A sample schematic for direct coil current measurement
with AD8418 is published in the TMCC160-EVAL board schematic.
The input voltage range of the TMCC160 current sense inputs I_U, I_V is 0..VCC.
Both signals will be routed to the TMCC160 microcontroller and converted with
a resolution of 12 bits. For a symmetric motor current measurement in positive
and negative direction, the current amplifier must output VCC/2 at zero motor
current to meet the TMCC160 offset configured.
NOTE:
4.5.1
Direct Coil Current
Measurement
4.5.2
Recommended
Schematic for
Direct Coil
Measurement
Current Sense
Inputs