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L9945 データシート(PDF) 26 Page - STMicroelectronics

部品番号 L9945
部品情報  Automotive fully configurable 8-channel High/Low side MOSFET pre-driver suitable for 12 V and 24 V systems
PDF  144 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9945 データシート(HTML) 26 Page - STMicroelectronics

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Figure 13. Clamping for HS configuration
GADG2702171244PS
GNSPxx
To load
VPS
CM
IPU
IPD
VGBHI
Internal
clamping
Control
signal
Control
signal
D
Ratings: NMOS ==> VGS = 20 V , PMOS ==> VSG = 20 V
evice side
Board side
HS NFET
VPS
GNSPxx
SNGPxx
DRNxx
External
clamping
CM
IPU
IPD
Internal
clamping
To load
Control
signal
Control
signal
Device side
Board side
HS PFET
SNGPxx
DRNxx
External
clamping
RPU
RG
RG
Figure 13 shows the recommended clamping for the external FETs used in HS configuration. The internal
clamping is meant to protect against overdrive but is not intended to be a recirculation path for the current. An
external freewheeling diode is needed for inductive switching loads.
Figure 14. Clamping for LS configuration
To load
To PGND
CM
IPU
IPD
VGBHI
Internal
clamping
RG
Control
signal
Control
signal
Device side
Board side
LS NFET
GNSPxx
SNGPxx
DRNxx
External
clamping
VBATT
GADG2702171519PS
Figure 14 shows the recommended clamping solutions for the LS configuration. Voltage on the DRNx pin has to
be limited to prevent component damage. A suppressor circuit can be used to clamp the voltage on DRNx pin
(AMR is 60 V). For the freewheeling of inductive loads:
•
A Zener feedback to the gate can be a solution to allow active freewheeling;
•
A diode on DRNx pin can be used to allow passive freewheeling towards battery.
5.4.6
Electrical characteristics
The table below lists the electrical characteristics for the output pre-drivers.
L9945
Functional description
DS12275 - Rev 10
page 26/144



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