DRV8809 Datasheet, PDF (32/44 Pages) Texas Instruments – COMBINATION MOTOR DRIVERS WITH DC-DC CONVERTERS

DRV8809
DRV8810
SLVS854A – JULY 2008 – REVISED JULY 2008 ............................................................................................................................................................... www.ti.com
VM
(CSELECT = Open)
VthVM+
VM=6.0v
VthVM -
VM=5.0v
Capture C_select
then start
Charge Pump
VCP
DC/DC_A
DC/DC_B
10 ms
(Note A)
C P s tart to
D C/D C d elay
DC/DC_C
nORT
(= L )
Delay
(Note B)
120 ms
(20 ms +
100 ms)
Protection mask:
OCP/OVP/UVP
for CH-A/B/C
(= H)
A. Charge-pump wake-up delay, from 10 ms to 20 ms, due to asynchronous event capture
B. For the DRV8809, delay is 1.6 ms for both DC_MODE high and low. For the DRV8810, delay is 20 ms to 40 ms for
DC_MODE high and 1.6 ms for DC_MODE low.
Figure 23. Power-Up Timing (Power Up With DC-DC Turn-On By C_SELECT)
NOTE:
When V_M crosses VthV_M+ (about 6 V), the C_select state is captured. If C_SELECT is
open (pulled up to internal 3.3 V), all DC-DC regulator channels (A, B, and C) are
turned on. The time of channels B and C to be turned on, with regards to channel A,
depends on the state of DC_MODE.
32
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