TMC603 DATA SHEET (V. 1.06 / 26. Mar. 2009)
25
5.5 Power supply
The TMC603 integrates a +12V switching regulator for the gate driver supply and a +5V linear
regulator for supply of the low voltage circuitry. The switching regulator is designed in a way, that it
provides the charge pump voltage by using a Villard voltage doubler circuit. It is able to provide
enough current to supply a number of digital circuits by adding an additional 3.3V or 5V low voltage
linear or switching regulator. If a +5V microcontroller with low current requirement is used, the +5V
regulator is sufficient, to also supply the microcontroller.
+VM
optional supply filter
VM+10V
charge pump
components when supply
ripple is high due to low
filter capacity for
220n
16V
BAV99 (70V)
BAS40-04W (40V)
4µ7
Tantal 25V
220n
transistor bridges
SMD
induct.
1µH
or 4R7
12V supply
LSW
(150mA with
TP0610K
or BSS84
(opt. BC857)
100n
(2x)
100µ
sel. transistor)
SS16
100n
(2x)
1µ
LSW: 220µH for 100kHz
VM
SWOUT
VLS
VCP
TMC603 voltage
regulators
5V
linear
regulator
5VOUT
VCC
VM-12V /
2mA driver
startup
current
5V supply
100nF
triangle OSC
COSC
+VCC
Q
S
R
14k
COSC: 470p ->100kHz
+VCC
Q
R
R1
R2
5/12 VLS
R
150mV
triangle
4/5R
1/5R
10R
dutycycle
limit
R
GND
figure 18: power supply block
Pin
Comments
COSC
Oscillator capacitor for step down regulator. A 470pF capacity gives 100kHz
operation. Do not leave this pin unconnected. Tie to GND, if oscillator is not used.
SWOUT
5VOUT
Switch regulator transistor output. The output allows driving of a small signal P-
channel MOSFETs as well as PNP small signal transistors
Output of internal 5V linear regulator. Provided for VCC supply
5.5.1 Switching regulator and charge pump
The switching regulator has been designed for high stability. It provides an upper duty cycle limit, in
order to ensure switching operation even at low supply voltage. This allows the combination with a
Villard voltage doubler. The application schematic shows a number of standard values, however, the
coil and oscillator frequency can be altered:
The choice of the external switching regulator transistor depends on the desired load current and the
supply voltage. Especially for high switching frequencies, a low gate charge MOSFET is required. The
following table shows an overview of available transistors and indicative operation limits. For a higher
output current, two transistors can be used in parallel. In this case the switching frequency should be
halved, because of the higher gate charge leading to slower switching slopes.
Copyright © 2008 TRINAMIC Motion Control GmbH & Co. KG
TRINAMIC [ TRINAMIC MOTION CONTROL GMBH & CO. KG. ]
