DRV3201-Q1_16 Datasheet, PDF (43/60 Pages) Texas Instruments – DRV3201-Q1 3 Phase Motor Driver-IC for Automotive Safety Applications

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Typical Application (continued)
VBOOST-VS
16V
14V
1) When VBOOST-VS>16V, boost FET kept on untill
current limit reached. No off-time calculated untill
VBOOST-VS<14V
IL
ILcurlim =
0.1VRboost_shunt
DRV3201-Q1
SLVSBD6D – MAY 2012 – REVISED AUGUST 2015
2) When VBOOST-VS<14V,
new off-time calculated.
Boost FET turned on after off-time passed
ton toff = VS / (VBOOST * fBOOST)
ton+toff = 1 / fBOOST
toff =
VS / (VBOOST * fBOOST)
toff = VS / (VBOOST * fBOOST) ^ton toff = VS / (VBOOST * fBOOST)
ton+toff = 1 / fBOOST
Figure 17. Boost Waveforms Showing Burst Pulsing Controlled by Hysteretic Comparator Levels
8.2.1.3 Application Curves
B82442A1683K Inductor Used
Nominal Battery Voltage at VS
Figure 18. Coil Current Waveforms in Steady State for
Nominal Battery Voltage
B82442A1683K Inductor Used
High Battery Voltage at VS
Figure 19. Coil Current Waveforms in Steady State for
High Battery Voltage
B82442A1683K Inductor Used
Low Battery Voltage at VS
Figure 20. Coil Current Waveforms in Steady State for Low
Battery Voltage
B82442A1683K Inductor Used
Figure 21. Boost Waveforms Showing Burst Pulsing
Controlled by Hysteretic Comparator Levels
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