DRV8839 Datasheet, PDF (7/17 Pages) Texas Instruments – LOW VOLTAGE DUAL 1/2-H-BRIDGE DRIVER IC

DRV8839
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FUNCTIONAL DESCRIPTION
SLVSBN4 – JANUARY 2013
Bridge Control
The DRV8839 is controlled using separate enable and input pins for each ½-H-bridge.
The following table shows the logic for the DRV8839:
ENx
INx
OUTx
0
X
Z
1
0
L
1
1
H
Sleep Mode
If the nSLEEP pin is brought to a logic-low state, the DRV8839 will enter a low-power sleep mode. In this state
all unnecessary internal circuitry is powered down.
Power Supplies and Input Pins
The input pins may be driven within their recommended operating conditions with or without the VCC and VM
power supplies present. No leakage current path will exist to the supply. There is a weak pulldown resistor
(approximately 100 kΩ) to ground on each input pin.
VCC and VM may be applied and removed in any order. When VCC is removed, the device will enter a low
power state and draw very little current from VM. If the supply voltage is between 1.8 V and 7 V, VCC and VM
may be connected together.
Protection Circuits
The DRV8839 is fully protected against undervoltage, overcurrent and overtemperature events.
Overcurrent Protection (OCP)
An analog current limit circuit on each FET limits the current through the FET by removing the gate drive. If this
analog current limit persists for longer than the OCP time, all FETs in the H-bridge will be disabled. After
approximately 1 ms, the bridge will be re-enabled automatically.
Overcurrent conditions on both high and low side devices; i.e., a short to ground, supply, or across the motor
winding will all result in an overcurrent shutdown.
Thermal Shutdown (TSD)
If the die temperature exceeds safe limits, all FETs in the H-bridge will be disabled. Once the die temperature
has fallen to a safe level operation will automatically resume.
Undervoltage Lockout (UVLO)
If at any time the voltage on the VCC pin falls below the undervoltage lockout threshold voltage, all circuitry in
the device is disabled and internal logic is reset. Operation resumes when VCC rises above the UVLO threshold.
Copyright © 2013, Texas Instruments Incorporated
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