DRV8809 Datasheet, PDF (41/44 Pages) Texas Instruments – COMBINATION MOTOR DRIVERS WITH DC-DC CONVERTERS

DRV8809
DRV8810
www.ti.com ............................................................................................................................................................... SLVS854A – JULY 2008 – REVISED JULY 2008
APPLICATION INFORMATION
Application Schematic
For one stepper and two DC motor configuration:
• DC-DC Ch-A = 5 V (12 V)
• DC-DC Ch-B = 1.5 V
• DC-DC Ch-C = 3.3 V
If start-up from Ch-B (1.5 V) ≥ Ch-A (5 V), Ch-C 3.3 V should be turned on by the setup register (200 kΩ
between C_SELECT pin and GND).
Vout 1
5.0v
(12.0v) _0.1uF
5.6k
(9.1k)
2.4k
(1.3k)
Vout 2
1.5v
0.1uF
Vout 3
3.3v
0.1uF
1.2k
1.0k
C_SELECT
200 k
330uH _{OD_A}
220uF
FBA
1.48v
330uH _{OD_B}
220uF
FBB
3.0k
1.50v
330uH
OD_C
220uF
1.50v FBC
In-Reset
OSCD_Mon
OSCM_Mon
LOGIC_OUT
nORT
nSLEEP
DCDC_MODE
0.1uF
Cstrage
0.01uF
Cbkt
VM
TH_OUT
VCP CP1 CP2
VDIN _VM
100uF
DC/DC
convertor
Ch-A
Temperature
Sens :
Pre-TSD or
Tsens (analog)
Thermal
Shut down
Voltage
charge
pump
To
To Highside _DC/DC
gate drive
Motor Drive
Output
Control A
To
Hbridges
OUTA+
RSA
VM
0.2 ohm
OUTA-
MGND
DC/DC
convertor
Ch-B
Voltage
Supervisory
VM
Regulator
Internal
supply
DC/DC
convertor
Ch-C
Pre-Drive, Latch
Registers &
control circuitry
Freq divider
for DC/DC
OSCi
6.4MHz
Freq divider
Motor PWM
Motor Drive
Output
Control B
Motor Drive
Output
Control C
Motor Drive
Output
Control D
OUTB+
RSB
0.2 ohm
Stepper
Motor
OUTB-
VM
OUTC+
0.2 ohm
RSC
DC
Motor
OUTC-
MGND
OUTD+
0.2 ohm
RSD
OUTD-
VREF_AB
DC
Motor
2.5v
LGND
Setup / ex-setup
registers
Serial Interface A-B
Serial Interface C-D
VREF_SCD
ENABLE_SD (reserved) STROBE_AB DATA_AB CLK_AB ENABLE_SC PHASE_SD PHASE_SC
Figure 35.
Copyright © 2008, Texas Instruments Incorporated
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