EVAL6235PD
L6235 three-phase brushless DC motor driver demonstration board
Data brief
Features
■
Operating supply voltage from 8 V to 52 V
■
5.6 A output peak current (2.8 ARMS)
■
Operating frequency up to 100 kHz
■
Non-dissipative overcurrent protection
■
Constant off-time PWM current controller
■
60° and 120° Hall effect decoding logic
■
Brake function
■
TACHO output for speed loop
■
Suitable for EVALPRACTISPIN control
■
Capable of running in stand-alone mode
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Description
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The EVAL6235PD demonstration board is a fully
integrated DMOS three-phase brushless DC
motor driver.
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Used in conjunction with the EVALPRACTISPIN
interface board and practiSPIN software, the
board provides an evaluation platform to test the
features of the L6235 device. In particular, the
board provides a means to evaluate the power
dissipation performance of the IC in the PowerSO
package.
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An example of speed loop is implemented. The
speed information is obtained by analog
integration of the TACHO output. Fine tuning of
external components is needed to fit application
requirements.
The board is designed with a large GND area to
minimize noise and optimize power dissipation.
August 2011
Doc ID 022128 Rev 1
For further information contact your local STMicroelectronics sales office.
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www.st.com
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Board description
1
EVAL6235PD
Board description
The EVAL6235PD provides external connectors for the supply voltage, an external 5 V
reference for the logic inputs, three outputs for the motor and a 34-pin connector to control
the main functions of the board through the external interface board EVALPRACTISPIN.
Figure 1.
EVAL6235PD demonstration board
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Table 1.
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EVAL6235PD: connector and jumper description
Name
Type
CN1
Power supply
Board power supply (VS)
CN2
Power supply
Logic power supply (5V)
CN3
Power outputs
Half-bridge power outputs
CN4
Function
Signal connector Communication with interface board
JP1, JP2
Jumper
J1
Strip connector
S1
DIP switches
On-board 5V supply generation (closed)
Hall effect sensors signals and power supply
Allows enabling of the IC, to select to run in torque or speed mode, to
set the motor direction and motor braking (1)
1. Function available if board is running in stand-alone mode.
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EVAL6235PD
Board description
Table 2.
EVAL6235PD: 34-pin signal connector pinout
Pin number
Description
1
Board pull-up (5V)
2
L6235PD DIAG pin (diagnostic output)
4
Hall effect sensor 1 (H1)
11
Board pull-up (5V)
14
L6235PD EN pin (device enable)
20
Hall effect sensor 1 (H1)
22
L6235PD BRAKE pin (braking function)
23
Ground
25
Hall effect sensor 1 (H1)
26
Hall effect sensor 3 (H3)
28
L6235PD FWD/REV pin (motor direction)
31
L6235PD VREF pin (reference voltage)
32
Hall effect sensor 2 (H2)
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EVAL6235PD: electrical specification (recommended values)
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Parameter
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Supply voltage range (VS)
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Value
8 to 52 V
Up to 5.6 Apeak (2.8 ARMS)
Output current rating
Logic input voltage range
0 to +5V
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Operating temperature range
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Not connected
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Table 3.
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-25 °C to +125 °C
L6235PD thermal resistance junction-to-ambient
15 °C/W
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Figure 2.
Board description
EVAL6235PD
EVAL6235PD schematic diagram
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EVAL6235PD
Board description
Table 4.
EVAL6235PD component list
Part reference
Part value
C1
100µF – 63V
Electrolytic capacitor
C2
220nF – 100V
Ceramic capacitor
C3
10nF – 25V
Ceramic capacitor
C4, C10
220nF – 50V
Ceramic capacitor
C5
10µF – 16V
Electrolytic capacitor
C6
5.6nF – 50V
Ceramic capacitor
C7
1nF – 50V
Ceramic capacitor
C8
820pF – 50V
Ceramic capacitor
C9
10nF – 50V
Ceramic capacitor
C11
68nF – 50V
Ceramic capacitor
C12
100nF – 50V
Ceramic capacitor
D1
BAT46SW
D2
BZX384C5V1
R1
700W - 0.6Ω – 1%
R2
330kΩ - 1/4W
R3, R4, R7÷R9
10kΩ - 1/4W – 5%
R5
100Ω - 1/4W
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Resistor
Resistor
Resistor
Resistor
Resistor
100kΩ - 74W
Trimmer
R12, R14
470mΩ- 1W
Resistor
R16
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Zener diode
56kΩ - 1/4W
R10, R11
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Low drop diode couple
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R6
Pr
1MΩ
Resistor
R17
20kΩ - 1/4W – 1%
Resistor
R18
4.7kΩ - 1/4W
Resistor
R19
5.6kΩ - 1/4W – 1%
Resistor
R20
2.2kΩ - 1/4W
Resistor
R21, R15
1 kΩ - 1/4W
Resistor
R22
5kΩ - 74W
Trimmer
U1
L6235PD
3-phase BLDC DMOS motor driver
U2
LM358
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(1)
Part description
Low power dual operational amplifier
1. Alternative part number BAV99
Doc ID 022128 Rev 1
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Board description
Figure 3.
EVAL6235PD
EVAL6235PD component placement
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Figure 4.
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EVAL6235PD top side layout
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EVAL6235PD
Board description
Figure 5.
EVAL6235PD bottom side layout
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Doc ID 022128 Rev 1
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Using the EVAL6235PD
2
EVAL6235PD
Using the EVAL6235PD
The EVAL6235PD demonstration board can be used in combination with the
EVALPRACTISPIN interface board and practiSPIN software, or it can run in stand-alone
mode.
The 5 V for logic inputs and reference voltage is obtained from R1 and D2. For supply
voltages higher than 20 V, R1 must be replaced with a higher value resistor. The jumpers
JP1 and JP2 allow disconnecting the internal Zener diode network, in case the 5 V is
provided through pin 11 of CN4 (for example, an external microcontroller board can provide
5 V to the demonstration board).
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The CN2 connector can also be used to provide an external 5 V voltage to the board, and
CN2, or pin 1 of CN4, can be used to provide a 5 V voltage to external circuits. In this case,
only a small current can be drawn from the board, depending on the supply voltage and R1
value.
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Connection to the EVALPRACTISPIN interface board
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The EVAL6235PD board connects to the EVALPRACTISPIN board through the 34-pole
CN4 connector.
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Device evaluation can be performed by running the dedicated practiSPIN software. For
more details, please refer to application note AN1794 “PractiSPIN evaluation system
configuration and set up guide”, available at www.st.com.
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2.2
Running the EVAL6235PD in stand-alone mode
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When running the demonstration board in stand-alone mode, the four switches (S1) allow
the user to perform the following:
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–
enable the device
–
set the motor direction
–
brake the motor
–
choose to run in torque or speed mode
R17 and R22 set the reference voltage provided to the VREF pin of the L6235 (in torque
mode) or to the error amplifier, U2 (in speed mode). R20 and C11 make up a low-pass filter
to provide an external reference voltage by a PWM output of a microcontroller. R10 and C8
are used to set the off-time, and R11 and C9 set the duration of the TACHO output pulses.
For more details on the L6235PD IC, refer to the L6235 datasheet and application note
AN1625, both available on www.st.com.
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EVAL6235PD
3
Revision history
Revision history
Table 5.
Document revision history
Date
Revision
25-Aug-2011
1
Changes
Initial release.
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Doc ID 022128 Rev 1
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EVAL6235PD
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