TMC603 DATA SHEET (V. 1.06 / 26. Mar. 2009)
28
ICs which are directly supplied by the battery. In order to safely switch off the motor bridges during
standby, the gates of the high side MOSFETs become actively held in a discharged state using a low
current signal MOSFET in SOT23 package. Before entering standby mode, the motor shall be stopped
and the TMC603 should be disabled.
+Vbattery
+VM to bridge, only
100K
220n
POWER
SWITCH
FDC5614P
ꢀ
electronic
ON switch
+VM switched,
3A max.
10µ
27k
VM
TMC603
(only shown for
one high side
MOSFET)
ENABLE
HSx
enable
Standby power
supply 5-12V
1M
2N7002
SAFE
OFF
2N7002
nSTDBY
other bridges
figure 20: low power standby
5.5.6 Low voltage operation down to 9V
In low voltage operation, it is important to keep the gate driving voltages as high as possible. The
switching regulator for VLS thus is not needed and can be left out. Tie the pin COSC to GND. VLS
becomes directly tied to +VM, which is possible as long as the supply voltage does not exceed 14V
(16V peak). However, now a source for the Villard voltage doubler is missing. A simple solution is to
use a CMOS 555 timer circuit (e.g. TLC555) oscillating at 250 kHz (square wave) to drive the voltage
doubler.
optional supply filter
+9V...14V
VM+10V
charge pump
components when supply
ripple is high due to low
filter capacity for
100n
16V
BAS40-04W
470n
transistor bridges
SMD
induct.
1µH
or 4R7
12V supply
(150mA with
sel. transistor)
100n
(2x)
VCC
DISCH
RESET
OUT
100n
(2x)
22k
TLC555
1µ
THRES
CONT
TRIG
GND
150p
VM
SWOUT
VLS
VCP
5VOUT
VCC
5V supply
COSC
100nF
TMC603
figure 21: low voltage operation
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TRINAMIC [ TRINAMIC MOTION CONTROL GMBH & CO. KG. ]
