DRV8704 Datasheet, PDF (17/38 Pages) Texas Instruments – Dual H-Bridge PWM Gate Driver

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DRV8704
SLVSD29 – OCTOBER 2015
I (mA) source
TDRIVEP = 00
200 mA
IDRIVEP = 11
150 mA
IDRIVEP = 10
100 mA
IDRIVEP = 01
50 mA
Holding Current
IDRIVEP = 00
263 ns 525 ns 1.05 µs
I (mA) source
200 mA
150 mA
100 mA
50 mA
Holding Current
TDRIVEP = 10
IDRIVEP = 11
IDRIVEP = 10
IDRIVEP = 01
IDRIVEP = 00
263 ns 525 ns 1.05 µs
2.1 µs
2.1 µs
t (ns)
t (ns)
I (mA) source
200 mA
150 mA
100 mA
50 mA
Holding Current
TDRIVEP = 01
IDRIVEP = 11
IDRIVEP = 10
IDRIVEP = 01
IDRIVEP = 00
263 ns 525 ns
1.05 µs
2.1 µs
I (mA) source
200 mA
150 mA
100 mA
50 mA
Holding Current
TDRIVEP = 11
IDRIVEP = 11
IDRIVEP = 10
IDRIVEP = 01
IDRIVEP = 00
263 ns 525 ns 1.05 µs
2.1 µs
Figure 14. Gate Driver Source Capability
t (ns)
t (ns)
Holding Current
100 mA
200 mA
300 mA
400 mA
263 ns 525 ns
TDRIVEN = 00
1.05 µs
IDRIVEN = 00
IDRIVEN = 01
IDRIVEN = 10
IDRIVEN = 11
2.1 µs
t (ns)
Holding Current
100 mA
200 mA
300 mA
400 mA
TDRIVEN = 01
263 ns 525 ns 1.05 µs
IDRIVEN = 00
IDRIVEN = 01
IDRIVEN = 10
IDRIVEN = 11
2.1 µs
I (mA) sink
263 ns 525 ns
Holding Current
100 mA
200 mA
300 mA
400 mA
TDRIVEN = 10
1.05 µs
IDRIVEN = 00
IDRIVEN = 01
IDRIVEN = 10
IDRIVEN = 11
2.1 µs
t (ns)
I (mA) sink
263 ns 525 ns
Holding Current
100 mA
200 mA
300 mA
400 mA
TDRIVEN = 11
1.05 µs
2.1 µs
IDRIVEN = 00
IDRIVEN = 01
IDRIVEN = 10
IDRIVEN = 11
I (mA) sink
I (mA) sink
Figure 15. Gate Driver Sink Capability
t (ns)
t (ns)
7.3.7 Configuring Gate 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 motors 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.
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