DRV8803_16 Datasheet, PDF (8/26 Pages) Texas Instruments – Quad Low-Side Driver IC

DRV8803
SLVSAW5C – JULY 2011 – REVISED NOVEMBER 2015
7 Detailed Description
www.ti.com
7.1 Overview
The DRV8803 device is an integrated 4-channel low side driver solution for any low side switch application. The
integrated overcurrent protection limits the motor current to a fixed maximum. Four logic inputs control the low-
side driver outputs which consist of four N-channel MOSFETs that have a typical R_DS(on) of 500 mΩ. A single
power input VM serves as device power and is internally regulated to power the internal low side gate drive.
Motor speed can be controlled with pulse-width modulation at frequencies from 0 kHz to 100 kHz. The device
outputs can be disabled by bringing nENBL pin high. The thermal shutdown protection enables the device to
automatically shut down if the die temperature exceeds a TTSD limit. UVLO protection will disable all circuitry in
the device if V_M drops below the undervoltage lockout threshold.
7.2 Functional Block Diagram
8.2V – 60V
VM
nENBL
RESET
IN1
IN2
IN3
IN4
nFAULT
Thermal
Shut down
Internal
Reference
Regs
UVLO
Control
Logic
Int. VCC
LS Gate
Drive
OCP
&
Gate
Drive
OCP
&
Gate
Drive
OCP
&
Gate
Drive
OCP
&
Gate
Drive
8.2V – 60V
Optional
Zener
VCLAMP
OUT1
Inductive
Load
OUT2
Inductive
Load
OUT3
Inductive
Load
OUT4
Inductive
Load
GND
(multiple pins)
7.3 Feature Description
7.3.1 Output Drivers
The DRV8803 device contains four protected low-side drivers. Each output has an integrated clamp diode
connected to a common pin, VCLAMP.
VCLAMP can be connected to the main power supply voltage, VM. VCLAMP can also be connected to a Zener
or TVS diode to VM, allowing the switch voltage to exceed the main supply voltage VM. This connection can be
beneficial when driving loads that require very fast current decay, such as unipolar stepper motors.
In all cases, the voltage on the outputs must not be allowed to exceed the maximum output voltage specification.
8
Submit Documentation Feedback
Product Folder Links: DRV8803
Copyright © 2011–2015, Texas Instruments Incorporated