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2022-09-16 16:00:09
DRV8801-Q1 DMOS full bridge motor driver
Features
Suitable for car applications
AEC-Q100 to meet the following results:
-Equipment temperature level 1: TA -40OC To 125OC- Equipment HBM ESD level H2
- Device CDM ESD classification C4
Low RDS (on) output (0.83ΩHS+LS typical value)
low power sleep mode
support 100%PWM
8–38 V working power supply voltage range
thermal enhancement surface installation component
can be configured with current limit
protection function
—VBB IOU pressure Lock (UVLO)
- Over -current protection (OCP)
- Short -circuit protection
- Short -circuit protection of the ground
- Overheating warning (OTW)- Super temperature stop (OTS)
- Excessive current and overheating fault conditions displayed on the pin
Application
#8226 Auto body system
Door lock
HVAC actor
Cross -electricity alarm
Description
DRV8801-Q1
provides a general-purpose power-driven solution with a full H bridge driver. This device can drive a winding of a DC motor or a stepping motor, and other devices, such as the snail tube. A simple phase/enable interface can easily connect to the controller circuit.
The output level is configured with n-channel power MOSFET with #189; -H bridge. The peak output current of DRV8801-Q1 is as high as ± 2.8A, and the working voltage is as high as 38V. The internal charge pump generates the required grid drive voltage. A low -power dormant mode is provided, which shut down the internal circuit to achieve very low static current consumption. This sleep mode can be set using a special NSLEEP pin.
Provide internal protection functions: under pressure atresia, overcurrent protection, short -circuit protection of power supply, short -circuit protection on the ground, ultra -temperature alarm, and ultra -temperature stop. Excessive current (including short -circuit of ground and short circuit of power supply) and overheating failure conditions through NFAULT pins.
DRV8801-Q1 is encapsulated in 16-pin QFN packagingWith exposed heat dissipation pads, it provides enhanced heat dissipation effects.
Equipment information
(1), please refer to the appointment of the doctor's order content at the end of the data table.
Simplified schematic diagram
Typical features
Overview [overview [overview
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Overview [overview
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DRV8801-Q1 is an integrated motor driver solution for brushing DC motors. The device integrates the DMOS H bridge and current detection and protection circuit. This device can be powered by 8 to 38V power supply voltage and can provide an output current up to 2.8A peak.A simple phase enable interface to allow the speed and direction of the motor to control the motor.
The system controller provides a diversion amplifier output for accurate measurement current. The voltage output of VPROPI pins is 5 times the sensing pins voltage.
Including a low -power dormant mode, the system allows the system to save electricity when not driving the motor.
Function box diagram
Feature description
Electric power supervisor
When the DRV8801-Q1 device is not used, control input input NSLEEP is used for minimizing power consumption. NSLEEP input has disabled many internal circuits, including internal voltage rails and charge pumps. NSLEEP was asserted as low logic. The logic of this input pin causes normal operation. When switching from low to high, the user should allow 1 millisecond delay before applying the PWM signal. The oil supply pump takes this time to stabilize.
Bridge control
Table 1 shows the logic of DRV8801-Q1:
In order When the current is close to 0 A, the output will enter a high impedance state.
The current path of each state in the above logic table is shown in Figure 6. 
Input mode 1 is used to switch between fast attenuation mode and slow attenuation mode. The logic is in the mode of slow attenuation.
Mode 2
Mode 2 is used to select which set of drivers (high -voltage side and low voltage side) during the slow decline cycle. Only when Mode 1 is asserted to be high, Mode 2 is meaningful. The logic high level of Mode 2 is re -circulated by the high -voltage side drive. Logic low levels circulate current through low -voltage side drives.
Synchronous rectification rapid attenuation
This decay mode is equivalent to the driving field effect crystal tube (2 in Figure 6) The opposite field effect transformation (FET) changes. When fast attenuation, the motor current is not allowed to be negative because this will cause changes in the direction. Instead, when the current is close to zero, the driver will be closed. For the formula for calculating power, see the power consumption part.
Synchronous rectification and slow attenuation (braking mode)
In the slow attenuation mode, the low -voltage and high -voltage side drives will be turned on. The allowable current through the H bridge and the load of the low -voltage side and the high -voltage side main body will be allowed The diode cycle (3 and 4 in Figure 6). For the formula for calculating the power of high and low -side slow decay, please refer to the power consumption part.
Charging pump
The charge pump is used to generate a power supply higher than VBB to drive the DMOS door at the source end. A 0.1-μF ceramic single-chip capacitor should be connected between CP1 and CP2 to pump. A 0.1 μF ceramic single -chip capacitor is connected between the VCP and VBB as a energy storage device to run the high -side DMOS device. 
Low -value resistors can be placed between sensing pins and grounding, for current influenza. In order to make the sensing output current of the current grounding trace IR minimum, the current influenza responder should have an independent grounding circuit to connect to the star ground. This trajectory should be as short as possible. For low -value sensing resistors, the decrease in IR in PCB may be very significant and should be considered.
Set a manual over -current check threshold, and place a resistor between the detection pin and GND. When the induction pin rises to more than 500 millions, the H bridge output is disabled (Hi-Z). The device is automatically reviewed for a period of time T (OCP).
Available on a current check threshold can be calculated by Formula 1.
The selected over -current checking level cannot be greater than i (OCP).
vpropi
Vpropi output is about five times the voltage of the sensor pins. VPROPI is only meaningful when a resistor is connected to the detection pipe foot. If the inductive tube foot is grounded, VPROPI measures 0 V. It should also be noted that in the process of slow attenuation (braking), the VPROPI measurement value is 0 V. VPROPI can output a maximum of 2.5 V, because under the induction voltage of 500 MV, the H bridge is disabled. 
DRV8801-Q1 device can completely prevent VBB of underwriting, over-current and overheating events.
VBB IOU Lock (UVLO)
If the voltage on the VBB pin is lower than the voltage of the underwriter lock at any time, the HBRIDGE is in HBRIDGE All FETs will be disabled, and the charge pump will also be disabled. nfaultThe pin does not report the UVLO failure and keeps Hi-Z. When the VBB rises to the UVLO threshold, the operation is restored. 
Monitor the current flowing through the high -voltage and low -voltage side drives to ensure that the motor wire does not have a short circuit of power or ground. If the short -circuit is detected, all the fets in the H bridge will be disabled, the NFAULT is driven to a low level, and the T (OCP) fault timer starts. After T (OCP), the device allows the device to follow the input command and try another opening (the NFAULT release is released during this attempt). If there is still a failure, the cycle is repeated. If T (OCP) fails to exist after the failure, it will be restored and NFAULT will be restored normally.
Super temperature warning (OTW)
If the mold temperature rises exceeding the thermal warning threshold, the NFAULT pin driving is low. When the temperature of the mold drops below the lag, the NFAULT pin is released. If the mold temperature continues to rise, the device will enter the overheating shutdown described in the ultra -temperature shutdown (OTS) part.
Super temperature stop (OTS)
If the mold temperature exceeds the heat shutdown temperature, all the FET in the H bridge will be disabled and the charge pump will be closed. In this fault, the NFAULT pin keeps down. When the mold temperature drops below the lag threshold, the operation will be automatically recovered.
Hot shutdown (TSD)
Two mold temperature monitors are integrated on the chip. When the mold temperature rises to the maximum value, a thermal warning signal will be triggered at 160 ° C. This failure can cause NFAULT LOW (low failure), but the operation of the chip will not be prohibited. If the mold temperature rises further to about 175 ° C, the output of the entire bridge will be disabled until the internal temperature drops to a lag below 15 ° C.
Device function mode
Unless Nsleep's pin logic is low, DRV8801-Q1 device is in a state of activity. In the dormant mode, the charge pump is disabled, and the Hi-Z is disabled by Hi-Z. If the NSLEEP logic is high, the DRV8801-Q1 device will automatically exit the dormant mode.
Application and implementation
Note
The information in the following application chapters is not part of the TI component specification, TI does not guarantee its accuracy or integrity. TI's customers are responsible for determining the applicability of the component. Customers should verify and test their design implementation to confirm the system function.
Application information
DRV8801-Q1 device is used to control the DC motor control application.
Typical application
Design requirements
In this design exampleThe parameters are used as the input parameter.
Detailed design program
motor voltage
The motor voltage used depends on the rated value of the selected motor and the required speed. The higher voltage makes the rotation speed of the brushing motor faster, and the same pulse width modulation duty cycle is applied to the power field effect transistor. The higher voltage will also increase the current changes in the current through the inductive motor winding.
Power consumption
DRV8801-Q1 power consumption is the function of the RMS motor current and the FET resistance (ON) of each output.
In this example, the ambient temperature is 35 ° C and the knot temperature reaches 65 ° C. At 65 ° C, the sum of RDS (on) is about 1Ω. If the motor current is 0.8 A, the power dispersed in the form of heat will be 0.8 A2X 1 #8486; 0.64 W.
The temperature reached by DRV8801-Q1 depends on the heat resistance to air and PCB. It is important to welded the equipment hot pads to the PCB floor, and the top of the top and bottom plates are used to disperse the heat to the PCB and reduce the equipment temperature. In the example used here, the effective thermal resistance of DRV8801-Q1 is 47 ° C/W, and:
The motor current jump point
Dangdang When the pin sensing voltage exceeds VTRIP (0.5 V), the current is detected. The size of the RSENSE resistor should set the required ITRIP level.
Set the iTrip to 2.5 a, RSENSE 0.5 v/2.5 a 0.2 #8486;
To prevent accidental jumping, ITRIP must be higher than the normal working current. Motor current during startup is often much larger than steady -state rotation, because the initial load torque is higher, and no anti -electrocomputer will cause higher voltage and additional currents on the motor winding.
It is useful to limit the start-up current by using series inductors on DRV8801-Q1 output, because this can reduce ITRIP and may reduce the volume capacitance required by the system. The start -up current can also be limited by increasing the positive driver's duty cycle. 
In order to obtain the best performance, the sensor must be:
Low inductance
The rated power is high enough
near the motor drive
Drive current
This current path is through the high side. Source DMOS driver, motor winding, and low -side sink DMOS driver. The power consumption I2R is lost in a source and a receiver DMOS driver, such as equal 5.
Application curve
Power suggestion
Body capacitor
It is suitable Local volume capacitance is an important factor in the design of the motor drive system. Generally speaking, more volume capacitors are beneficial, but the disadvantage is increased cost and physical dimensions.
The required local power capacity depends on multiple factors, including:
the highest current required for the motor system. 
Parasitic inductance between the power supply and the motor system.
acceptable voltage ripples.
the type of motor (brush, brushless DC, step motor).
motor braking method.
The inductance between the power supply and the motor drive system will limit the change rate of power current. If the local large -capacity capacitance is too small, the system will respond to excessive current requirements, or uninstall from the motor as the voltage changes. When using sufficient large -capacity capacitors, the motor voltage remains stable and can quickly provide large current.
The data table usually provides a recommended value, but it is necessary to perform system -level tests to determine large -capacity capacitors with appropriate size.
Layout
Layout Guide
Print circuit board (PCB) should use heavy floor floor. In order to obtain the best electrical and thermal performance, DRV8801-Q1 must be directly welded to the circuit board. Below the DRV8801Q1 is a hot pad, which provides a path to enhance heat dissipation. The hot pads should be welded directly on the exposed surface of PCB. The thermal hole is used to pass the heat to other layers of the PCB.
Load power supply foot VBB should be connected parallel with electrolytic capacitors (usually 100 μF) and ceramic capacitors (0.1 μF), as close to the equipment as possible.
VCP and VBB and CP1 and CP2 ceramic capacitors (0.1 μF) should be as close to the device as possible. 
layout example