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DRV8434E/P Datasheet(PDF) 21 Page - Texas Instruments

Part # DRV8434E/P
Description  DRV8434E/P Dual H-Bridge Motor Driver With Integrated Current Sense and Smart Tune Technology
PDF  48 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

DRV8434E/P Datasheet(HTML) 21 Page - Texas Instruments

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7.3.3.4 Smart tune Ripple Control
t
BLANK
t
OFF
t
DRIVE
I
TRIP
t
BLANK
t
DRIVE
t
OFF
t
BLANK
t
DRIVE
I
TRIP
t
BLANK
t
DRIVE
t
OFF
I
VALLEY
t
OFF
t
OFF
t
BLANK
t
DRIVE
t
BLANK
t
DRIVE
I
VALLEY
t
BLANK
t
DRIVE
t
OFF
Figure 7-8. Smart tune Ripple Control Decay Mode
Smart tune Ripple Control operates by setting an IVALLEY level alongside the ITRIP level. When the current level
reaches ITRIP, instead of entering slow decay until the tOFF time expires, the driver enters slow decay until IVALLEY
is reached. Slow decay operates similar to mode 1 in which both low-side MOSFETs are turned on allowing the
current to recirculate. In this mode, tOFF varies depending on the current level and operating conditions.
This method allows much tighter regulation of the current level increasing motor efficiency and system
performance. Smart tune Ripple Control can be used in systems that can tolerate a variable off-time regulation
scheme to achieve small current ripple in the current regulation.
7.3.3.5 Blanking time
After the current is enabled (start of drive phase) in an H-bridge, the current sense comparator is ignored for a
period of time (tBLANK) before enabling the current-sense circuitry. The blanking time also sets the minimum drive
time of the PWM. The blanking time is approximately 1 µs.
7.3.4 Charge Pump
A charge pump is integrated to supply a high-side N-channel MOSFET gate-drive voltage. The charge pump
requires a capacitor between the VM and VCP pins to act as the storage capacitor. Additionally a ceramic
capacitor is required between the CPH and CPL pins to act as the flying capacitor.
www.ti.com
DRV8434E
SLOSE49 – NOVEMBER 2020
Copyright © 2020 Texas Instruments Incorporated
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