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| DRV8848_15 Datasheet, PDF (13/28 Pages) Texas Instruments – DRV8848 Dual H-Bridge Motor Driver | |||
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www.ti.com
xVM
DRV8848
SLLSEL7 â OCTOBER 2014
xOUT1
1 Drive Current
1
2 Fast decay
xOUT2 3 Slow decay
2
3
Figure 8. Decay Modes
PWM
ON
Mixed Decay
25%
PWM OFF (tOFF)
Itrip 25% of tOFF
PWM CYCLE
Figure 9. Mixed Decay
8.3.6 Protection Circuits
The DRV8848 is fully protected against undervoltage, overcurrent, and overtemperature events.
8.3.6.1 OCP
An analog current limit circuit on each FET limits the current through the FET by limiting the gate drive. If this
analog current limit persists for longer than the OCP deglitch time tOCP, all FETs in the H-bridge are disabled and
the nFAULT pin is driven low. The device remains disabled until the retry time tRETRY occurs. The OCP is
independent for each H-bridge.
Overcurrent conditions are detected independently on both high-side and low-side devices; that is, a short to
ground, supply, or across the motor winding all result in an OCP event. Note that OCP does not use the current
sense circuitry used for PWM current control, so OCP functions even without presence of the xISEN resistors.
Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: DRV8848
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