On Semi's LV8907 is a high-performance AEC-Q100 licensed sensorless three-phase brushless DC (BLDC) motor controller that integrates a gate driver for driving an external N-MOSFET. The two-stage charge pump provides a variety of low RDS (ON) The gate voltage required for an external N-MOSFET, operating junction temperature up to 175oC, operating voltage 5.5V to 20V, mainly used in automotive pumps (fuel pumps, oil pumps and pumps), fans (HVAC, heat sink, battery cooling , LED headlight cooling) as well as white goods and industrial BLDC motor control. This article describes the main features of LV8907, block diagram, typical application circuit and evaluation board LV8907UWGEVK main features, circuit diagram and bill of materials.
The LV8907 is a high performance, AEC-Q100 qualified, sensor-less three-phase BLDC motor controller with integrated gate drivers for driving external N-MOSFETs. An on-chip two-stage charge pump provides required gate voltage for a wide range of Low RDS(ON) type external N-MOSFETs. The device offers a rich set of system protecTIon and diagnosTIc funcTIons such as over-current, over-voltage, short-circuit, under-voltage, over-temperature and many more. Open-loop as well as closed-loop speed control with user configurable startup, speed setTIng and proportional/integral (PI) control coefficients, making it suitable for a wide range of motor and load combinations. With a built-in linear regulator for powering External circuits, a watchdog timer, and a LIN (Local Interconnect Network) transceiver, the LV8907 offers a very small system solution. The LV8907 stores system parameters in embedded one-time programmable (OTP) non-volatile memory in The SPI interface is provided for parameter setting and monitoring the system status. With the operating junction temperature tolerance up to 175oC and electrically LIN compatible control signals (PWM and Enable), the LV8907 is an ideal solution for stand- Alone BLDC motor control systems.
Main features of LV8907:
AEC-Q100 qualified and PPAP capable. ï‚·
Operating junction temperature up to 175oC ï‚·
Operating voltage range from 5.5V to 20V with tolerance from 4.5V to 40V ï‚·
Embedded proprietary sensor-less trapezoidal and pseudo-sinusoidal commutation ï‚·
Supports open-loop as well as closed-loop speed control ï‚·
Integrated gate drivers for driving six N-MOSFETs ï‚·
Two-stage charge pump for continuous 100% duty cycle operation ï‚·
5V/3.3V regulator, LIN transceiver and Watchdog timer applications using an external microcontroller.
Configurable speed settings and PI control coefficients ï‚·
Various system protection features including:
Shoot through protection using configurable dead-time
Drain-source short detection
Cycle-by-cycle current limit and over-current shutdown
Over-voltage and under-voltage shutdown
Over-temperature warning and shutdown
Input PWM fault detection
Typical application of LV8907:
Automotive pumps (Fuel, Oil, and Hydraulic) ï‚·
Fans (HVAC, Radiator, Battery Cooling, LED Headlight Cooling) ï‚·
White goods and industrial BLDC motor control
Figure 1. LV8907 block diagram
Figure 2. LV8907 alone using the configuration diagram
Figure 3. LV8907 LIN-based control configuration diagram
LV8907UW evaluation board LV8907UWGEVK
The LV8907UWGEVK Evaluation Kit v1.0 is designed to provide an easy and quick development platform for three phase sensor-less BLDC motor control applications using the LV8907UW. The LV8907UW is a stand-alone solution that does not need a microcontroller for operation. An Atmel The router is included in the kit to communicate via USB with the PC based graphical user interface (GUI) and support some peripheral functions such as current and voltage measurement, and external temperature monitoring for easier system development. For quick-start and basic The kit consists Of:
1. LV8907UW Evaluation Board (EVB)
2. USB cable Type A to mini B.
3. Graphical User Interface.
Main features of the evaluation board LV8907UWGEVK:
• Motor operation: 7V to 20V (40V transient).
• Max current: 30A.
• Maximum continuous power: 400W.
Figure 4. Outline drawing of the evaluation board LV8907UWGEVK
Figure 5. Evaluation board LV8907UWGEVK circuit diagram (1)
Figure 6. Evaluation board LV8907UWGEVK circuit diagram (2)
Evaluation Board LV8907UWGEVK Material List:
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