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L9945 Datasheet(PDF) 30 Page - STMicroelectronics

No. de pieza L9945
Descripción Electrónicos  Automotive fully configurable 8-channel High/Low side MOSFET pre-driver suitable for 12 V and 24 V systems
PDF  151 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9945 Datasheet(HTML) 30 Page - STMicroelectronics

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Figure 15. H-bridge driving configurations
GAPG0102161245CFT
M
GND
Rshunt
M
GND
Q1
Q3
Rshunt
GND
Q4
Rshunt
OFF
OFF
OFF
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
Q3
Q1
M
Out2(HB-)
CH4_OC
CH4
CH2
Q2
Out1(HB+)
CH3_OC
CH3
CH1
Q4
Q2
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
Q3
Q1
Q4
Q2
Out2(HB-)
CH4_OC
CH4
CH2
M
GND
Rshunt
M
GND
Rshunt
Out1(HB+)
CH3
CH1
CH3_OC
Q3
Q1
Q4
Q2
Out2(HB-)
CH4_OC
CH4
CH2
Out1(HB+)
CH3_OC
CH3
CH1
Q3
Q1
Q4
Q2
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
page 30/151



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