Trinamic TMC603-EVAL evaluation Board TMC603-EVAL 데이터 시트
제품 코드
TMC603-EVAL
TMC603 DATA SHEET (V. 1.05 / 11. Mar. 2009)
13
Copyright © 2008 TRINAMIC Motion Control GmbH & Co. KG
TMC603
PWM1
OUT1
OUT1
Microcontroller
with BLDC PWM
unit
BH1
BL1
PWM1
OUT2
OUT2
TMC603
PWM1
OUT
OUT
Microcontroller with
3 PWM outputs
BH1
BL1
INV_BL
BBM_EN
+V
CC
Block (Hall or hallFX) or
sine commutated BLDC
sine commutated BLDC
motor
Sine commutated BLDC
motor
TMC603
PWM1
OUT
OUT
Microcontroller
with 3 PWM
outputs
BH1
BL1
Block (Hall) commutated
BLDC motor
DIG
OUT
OUT
TMC603
PWM1
OUT
OUT
Microcontroller with
3 PWM outputs
BH1
BL1
INV_BL
BBM_EN
+V
CC
Block (Hall) or sine
commutated BLDC
commutated BLDC
motor
DIG OUT /
HI-Z
HI-Z
2k2
TMC603
Microcontroller
with 1 PWM output
BH1
BL1
ENABLE
/ERR_OUT
BBM_EN
+V
CC
Block (hallFX)
commutated BLDC
motor
DIG OUT
DIG OUT
PWM1
OUT
OUT
2k2
DIG IN
figure 7: examples for microcontroller PWM control
5.2.4
Slope control
The TMC603 driver stage provides a constant current output stage slope control. This allows to adapt
driver strength to the drive requirements of the power MOSFET and to adjust the output slope by
providing for a controlled gate charge and discharge. A slower slope causes less electromagnetic
emission, but at the same time power dissipation of the power transistors rises. The duration of the
complete switching event depends on the total gate charge. The voltage transition of the output takes
place during the so called miller plateau (see figure 6). The miller plateau results from the gate to drain
capacity of the MOSFET charging / discharging during the switching. From the datasheet of the
transistor (see example in figure 8) it can be seen, that the miller plateau typically covers only a part
(e.g. one quarter) of the complete charging event. The gate voltage level, where the miller plateau
starts, depends on the gate threshold voltage of the transistor and on the actual load current.
driver strength to the drive requirements of the power MOSFET and to adjust the output slope by
providing for a controlled gate charge and discharge. A slower slope causes less electromagnetic
emission, but at the same time power dissipation of the power transistors rises. The duration of the
complete switching event depends on the total gate charge. The voltage transition of the output takes
place during the so called miller plateau (see figure 6). The miller plateau results from the gate to drain
capacity of the MOSFET charging / discharging during the switching. From the datasheet of the
transistor (see example in figure 8) it can be seen, that the miller plateau typically covers only a part
(e.g. one quarter) of the complete charging event. The gate voltage level, where the miller plateau
starts, depends on the gate threshold voltage of the transistor and on the actual load current.
MOSFET gate charge vs. switching event
Q
G
– Total gate charge (nC)
V
G
S
–
G
a
te
t
o
s
o
u
rc
e
v
o
lt
a
g
e
(
V
)
10
8
6
4
2
0
0
5
10
15
20
25
V
D
S
–
D
ra
in
t
o
s
o
u
rc
e
v
o
lt
a
g
e
(
V
)
25
20
15
10
5
0
V
M
Q
MILLER
figure 8: MOSFET gate charge as available in device data sheet vs. switching event