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| DRV8846_15 Datasheet, PDF (21/35 Pages) Texas Instruments – DRV8846 Dual H-Bridge Stepper Motor Driver | |||
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www.ti.com
Sine DAC
Code
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1
0
00 - 100%
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0Z - 87.5%
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.80 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
Table 8. tBLANK Settings
Torque DAC I[1:0] Setting
01 - 75% Z0 - 62.5% ZZ - 50%
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.50 µs
1.20 µs
1.20 µs
1.50 µs
1.20 µs
1.20 µs
1.50 µs
1.20 µs
1.20 µs
1.50 µs
1.20 µs
1.20 µs
1.50 µs
1.20 µs
1.20 µs
1.50 µs
1.20 µs
1.20 µs
1.50 µs
1.20 µs
1.20 µs
1.50 µs
1.20 µs
1.20 µs
1.20 µs
0.90 µs
0.90 µs
1.20 µs
0.90 µs
0.90 µs
1.20 µs
0.90 µs
0.90 µs
1.20 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
Z1 - 37.5%
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
DRV8846
SLLSEK2 â JUNE 2014
10 - 25%
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
1.20 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
1Z - 12.5%
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
0.90 µs
8.3.6 Protection Circuits
The DRV8846 is fully protected against undervoltage, overcurrent, and overtemperature events.
8.3.6.1 Overcurrent Protection (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 without the presence of the xISEN resistors.
Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: DRV8846
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