DRV11873PWPR Datasheet, PDF (8/16 Pages) Texas Instruments – 12-V, 3-PHASE, SENSORLESS BLDC MOTOR DRIVER

DRV11873
SLWS237 – NOVEMBER 2012
www.ti.com
REVERSE SPIN CONTROL FR
DRV11873 has an FR pin to set the motor for forward or reverse spin. During DRV11873 power up, FR status
will be set. During normal operation, the spin direction of the motor will not change if the FR status is changed.
The FR status can be reset after the next PWM rising edge if PWM_IN was pulled low for 300 µs (when the FS
status is high) or 600 µs (when the FS status is low).
5-V LDO
DRV11873 has a built-in 5-V LDO which can output a 20-mA load current. It can provide 5-V bias voltage for
external use. A 2.2-µF ceramic capacitor is recommend to connect closely on the PCB layout between the V5 pin
and ground.
OVER CURRENT PROTECTION
DRV11873 can adjust over current through the external resistor connected to the CS pin and ground. Without
using an external current sense resistor, DRV11873 senses the current through the power MOSFET. Therefore,
there is no power loss during the current sensing. This current sense architecture improves the system efficiency.
Shorting the CS pin to ground will disable over current protection. During over current protection, DRV11873 will
only limit the current to the motor and it will not shut down the operation. The over current threshold can be set
by the value of the current sensing resistor through Equation 2.
I (A) = ⁶⁶⁰⁰
R_CS (W)
(2)
UVLO
DRV11873 has a built-in UVLO function block. The hysteresis of the UVLO threshold is 200 mV. The device will
be locked out when V_CC reaches 4.1 V and woken up at 4.3 V.
THERMAL SHUTDOWN
DRV11873 has a built in thermal shunt down function, which will shut down the device when the junction
temperature is over 160°C and will resume operating when the junction temperature drops back to 150°C.
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