TMC603A Datasheet, PDF (26/44 Pages) TRINAMIC Motion Control GmbH & Co. KG. – Three phase motor driver with BLDC back EMF commutation hallFX™ and current sensing

TMC603A DATA SHEET (V. 1.15 / 2009-Nov-19)
26
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
100n
(2x)
220n
4µ7
Tantal 25V
TP0610K
or BSS84
(opt. BC857)
220n
16V
LSW
SS16
VM+10V
charge pump
BAV99 (70V)
BAS40-04W (40V)
100µ
100n
(2x)
12V supply
(150mA with
sel. transistor)
optional supply filter
components when supply
ripple is high due to low
filter capacity for
transistor bridges
SMD
induct.
1µH
or 4R7
1µ
LSW: 220µH for 100kHz
VM
TMC603 voltage
regulators
startup
current
SWOUT
VM-12V /
2mA driver
VLS
VCP
5V
linear
regulator
5VOUT
VCC 5V supply
COSC
COSC: 470p ->100kHz
triangle OSC
14k
+VCC
QS
QR
R
1/5R
4/5R
+VCC
R
R1
5/12 VLS
150mV
triangle
R2
10R
100nF
R
dutycycle
limit
GND
figure 18: power supply block with example values
Pin
COSC
SWOUT
5VOUT
Comments
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.
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
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 © 2009 TRINAMIC Motion Control GmbH & Co. KG