L9945 datasheet(30/151 Pages) STMICROELECTRONICS

30 / 151 page

Figure 15. H-bridge driving configurations

GAPG0102161245CFT

GND

Rshunt

GND

Rshunt

GND

Rshunt

OFF

(Active) Freewheeling

low-side (forward)

(Active) Freewheeling

low-side (reverse)

High impedance

NPWM = ‘x’; DIR = ‘x’; HBx_AFW=’x’; HiZ=’1'

Out1(HB+)

CH3

CH1

CH3_OC

Out2(HB-)

CH4_OC

CH4

CH2

Out1(HB+)

CH3_OC

CH3

CH1

Out2(HB-)

CH4

CH2

CH4_OC

HBx_AFW=’0' -> Freewheel through Q3 diode

HBx_AFW=’1' -> Freewheel through Q3 MOSFET

NPWM = ‘1’; DIR = ‘0’; HiZ=’0'

HBx_AFW=’0' -> Freewheel through Q3 diode

HBx_AFW=’1' -> Freewheel through Q3 MOSFET

NPWM = ‘1’; DIR = ‘1’; HiZ=’0'

Out1(HB+)

CH3_OC

CH3

CH1

Out2(HB-)

CH4_OC

CH4

CH2

GND

Rshunt

GND

Rshunt

Out1(HB+)

CH3

CH1

CH3_OC

Out2(HB-)

CH4_OC

CH4

CH2

Out1(HB+)

CH3_OC

CH3

CH1

Out2(HB-)

CH4_OC

CH4

CH2

NPWM = ‘0’; DIR = ‘0’; HBx_AFW=’x’; HiZ=’0'

NPWM = ‘0’; DIR = ‘1’; HBx_AFW=’x’; HiZ=’0'

VBR

Rshunt

VBR

Rshunt

CH1_OC

CH2_OC

VBR

Rshunt

CH1_OC

CH2_OC

VBR

Rshunt

CH1_OC

CH2_OC

VBR

Rshunt

CH1_OC

CH2_OC

5.5.2

H-Bridge diagnostics

H-bridge status can be monitored by reading each channel diagnostic as if they operated independently (refer to

Section 6.2 Diagnostics overview). However, different OC sensing strategies can be implemented, as discussed

in Overcurrent detection. While in H-Bridge configuration, an extended set of values is available for OFF state

diagnostic timer (tDIAG), as shown in H-Bridge OFF state diagnostic timings.

5.5.3

H-bridge dead time

To prevent shoot-through (e.g. Q1 and Q3 ON) it's possible to choose different dead time values for both H-

bridges independently. Such parameters are selectable via SPI through the HBx_dead_time bit according to the

following table.

L9945

H-Bridge

DS12275 - Rev 8

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