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MCT8317A Datasheet(PDF) 19 Page - Texas Instruments

Part # MCT8317A
Description  MCT8317A High Speed Sensorless Trapezoidal Control Integrated FET BLDC Driver
PDF  161 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

MCT8317A Datasheet(HTML) 19 Page - Texas Instruments

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8.3.5 Slew Rate Control
An adjustable gate-drive current control for the MOSFETs in the output stage is provided to achieve configurable
slew rate for EMI mitigation. The MOSFET VDS slew rate is a critical factor for optimizing radiated emissions,
total energy and duration of diode recovery spikes and switching voltage transients related to parasitic elements
of the PCB. This slew rate is predominantly determined by the control of the internal MOSFET gate current as
shown in Figure 8-4.
VM
OUTx
VCP (Internal)
Slew Rate
Control
Slew Rate
Control
VCP (Internal)
GND
Figure 8-4. Slew Rate Circuit Implementation
The slew rate of each half-bridge can be adjusted through SLEW_RATE settings. Slew rate can be configured as
25-V/µs, 50-V/µs, 125-V/µs or 200-V/µs. The slew rate is calculated by the rise-time and fall-time of the voltage
on OUTx pin as shown in Figure 8-5.
20%
80%
20%
80%
t
fall
VM
t
rise
0
VM
V
OUTx
Time
Figure 8-5. Slew Rate Timings
www.ti.com
MCT8317A
SLLSFQ2 – JANUARY 2023
Copyright © 2023 Texas Instruments Incorporated
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