DRV8402 Datasheet, PDF (12/18 Pages) Texas Instruments – Dual Full Bridge PWM Motor Driver

DRV8402
SLES222 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
DIFFERENT MODE OPERATIONS
The DRV8402 supports three
operations:
1. Full bridge (FB) mode
2. Parallel full bridge (PFB) mode
3. Half bridge (HB) mode
different
mode
In full bridge and half bridge modes, PWM_A controls
half bridge A, PWM_B controls both half bridge B,
etc. Figure 6 shows an application example for full
bridge mode operation.
In parallel full bridge mode, PWM_A controls both
half bridge A and B, and PWM_B controls both half
bridge C and D, while PWM_C and PWM_D pins are
not used (recommended to connect to ground).
Bridges A and B are synchronized internally (even
during CBC), and so as bridges C and D. OUT_A and
OUT_B should be connected together and OUT_C
and OUT_D should be connected together after a
small output inductor. Figure 7 shows an example of
parallel full bridge mode connection.
Mode pins are configured as CBC current limit
operation in Figure 6 and Figure 7.
The DRV8402 can be also used in three phase
permanent magnet synchronous motor (PMSM)
applications. Because each half bridge has
independent supply and ground pins, a shunt sensing
resistor can be inserted between PVDD to PVDD_X
or GND to GND_X. A high side shunt resistor
between PVDD and PVDD_X is recommended for
differential current sensing because a high bias
voltage on the low side sensing could affect device
operation. OCL mode is recommended for a three
phase application. Figure 8 shows a three-phase
application example.
A decoupling capacitor close to each supply pin is
recommended for each application (not shown in
diagrams).
Figure 6. Application Diagram Example for Full
Bridge Mode Operation
PWM_A controls OUT_A and OUT_B;
PWM_B controls OUT_C and OUT_D.
Figure 7. Application Diagram Example for
Parallel Full Bridge Mode Operation
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