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| DRV8711 Datasheet, PDF (18/34 Pages) Texas Instruments – STEPPER MOTOR CONTROLLER IC | |||
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DRV8711
SLVSC40 â JUNE 2013
www.ti.com
Gate Pre-drive Source Capability
I (mA) source
I (mA) source
TDRIVEP = 00
TDRIVEP = 01
200 mA
200 mA
IDRIVEP = 11
IDRIVEP = 11
150 mA
150 mA
IDRIVEP = 10
IDRIVEP = 10
100 mA
100 mA
IDRIVEP = 01
IDRIVEP = 01
50 mA
Holding Current
IDRIVEP = 00
250 ns 500 ns
1 µs
50 mA
IDRIVEP = 00
t (ns)
Holding Current
2 µs
250 ns 500 ns
1 µs
2 µs
I (mA) source
200 mA
150 mA
100 mA
50 mA
Holding Current
TDRIVEP = 10
IDRIVEP = 11
IDRIVEP = 10
IDRIVEP = 01
IDRIVEP = 00
250 ns 500 ns
1 µs
2 µs
I (mA) source
200 mA
150 mA
100 mA
50 mA
t (ns)
Holding Current
250 ns 500 ns
TDRIVEP = 11
IDRIVEP = 11
IDRIVEP = 10
IDRIVEP = 01
IDRIVEP = 00
1 µs
2 µs
t (ns)
t (ns)
Holding Current
100 mA
200 mA
300 mA
400 mA
250 ns 500 ns
TDRIVEN = 00
1 µs
IDRIVEN = 00
IDRIVEN = 01
IDRIVEN = 10
IDRIVEN = 11
Gate Pre-drive Sink Capability
TDRIVEN = 01
2 µs
250 ns 500 ns
1 µs
t (ns)
Holding Current
IDRIVEN = 00
100 mA
IDRIVEN = 01
200 mA
IDRIVEN = 10
300 mA
IDRIVEN = 11
400 mA
2 µs
t (ns)
I (mA) sink
TDRIVEN = 10
250 ns 500 ns
1 µs
2 µs
Holding Current
100 mA
200 mA
300 mA
400 mA
IDRIVEN = 00
IDRIVEN = 01
IDRIVEN = 10
IDRIVEN = 11
t (ns)
I (mA) sink
250 ns 500 ns
Holding Current
100 mA
200 mA
300 mA
400 mA
TDRIVEN = 11
1 µs
2 µs
IDRIVEN = 00
IDRIVEN = 01
IDRIVEN = 10
IDRIVEN = 11
t (ns)
I (mA) sink
I (mA) sink
Figure 7. Gate Pre-Drive Source/Sink Capability
Configuring Pre-drivers
IDRIVE and TDRIVE are selected based on the size of external FETs used. These registers need to be
configured so that the FET gates are charged completely during TDRIVE. If IDRIVE and TDRIVE are chosen to
be too low for a given FET, then the FET may not turn on completely. It is suggested to adjust these values in-
system with the required external FETs and stepper motor in order to determine the best possible setting for any
application.
Note that TDRIVE will not increase the PWM time or change the PWM chopping frequency.
18
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Copyright © 2013, Texas Instruments Incorporated
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