TPS92662AQPHPRQ1 is an automotive-grade LED driver chip launched by Texas Instruments. It is designed for use in automotive lighting systems to provide efficient and reliable LED driving solutions. TPS92662AQPHPRQ1 integrates a variety of functions, including PWM dimming, overcurrent protection, temperature protection, etc.

The TPS92662AQPHPRQ1 supports a multipoint Universal Asynchronous Receiver Transmitter (UART) serial interface and is compatible with the TPS92662-Q1 and TPS92663-Q1 devices. The I2C communication interface can be used to read and write an external EEPROM that stores system calibration data. Its onboard 8-bit ADC with two multiplexed inputs can be used for system temperature compensation and for measuring binning values allowing LED binning and encoding.

The TPS92662AQPHPRQ1 is a programmable Pierce crystal oscillator driver that achieves optimal performance by selecting the driver strength based on the quartz crystal or ceramic resonator manufacturer's recommendations. It also includes a clock buffer with selectable drive strength. By varying the drive strength of the clock buffer, the rise and fall times of the clock signal and EMI can be controlled. The clock buffer can be disabled when necessary to eliminate noise generated by the clock signal and minimize EMI.

Ⅰ.Specification parameters of TPS92662AQPHPRQ1

•Dimming:PWM
•Package:Reel
•Qualification:AEC-Q100
•Humidity Sensitivity:Yes
•Manufacturer:Texas Instruments
•Product category:LED lighting driver
•Installation style:SMD/SMT
•Package/Case:HTQFP-48
•Product:LED Drivers
•Topology:Boost, Buck
•Output voltage:Adjustable
•Number of output terminals:12 Output
•Minimum operating temperature:-40℃
•Maximum operating temperature:+125℃
•Input voltage (minimum):4.5 V
•Input voltage (maximum):60 V
•Number of channels:12 Channel
•Product Type:LED Lighting Drivers
•Installation type:surface mount type

Ⅱ.Functional features of TPS92662AQPHPRQ1

•12 integrated bypass switches

•Device HBM classification level H1C

•Multi-point UART communication interface

•External EEPROM I2C interface

•LED open/short detection and protection

•Compatible with CAN physical layer

•Integrated over-current protection function to protect LEDs and drive circuits from over-current damage

•Wide PWM dimming range to adapt to different lighting needs

•TPS92662AQPHPRQ1 features an efficient LED driver design that helps maximize system efficiency

•Ultra-low power consumption in standby mode, helping to save energy and extend system battery life

•Has fault detection and protection functions, able to monitor the working status of the LED drive circuit

•Equipped with a temperature protection mechanism that can monitor the chip temperature and take protective measures when it exceeds the safe range to prevent the chip from overheating

•Supports multi-LMM synchronization of more than 12 LED strings through time division multiplexing

Ⅲ.Application scenarios of TPS92662AQPHPRQ1

1.Automobile headlamps: TPS92662AQPHPRQ1 can be used to drive automobile headlamps, providing efficient and reliable LED lighting solutions. This application scenario requires the driver to provide sufficient brightness and dimmable functionality. TPS92662AQPHPRQ1 is used in automotive headlights to meet the following needs:

•Dimmable function: Depending on the driving environment and needs, the brightness of the headlight may need to be adjusted. TPS92662AQPHPRQ1 supports PWM dimming control, which means it can adjust the brightness of the LED headlights in real time according to instructions from the vehicle control system to adapt to different driving conditions.

•Efficient brightness control: Headlights need to be bright enough to ensure drivers have clear vision at night or in bad weather conditions. TPS92662AQPHPRQ1 ensures stable and efficient brightness output of LED headlights through its high-precision current control function.

•Fault detection and protection: In headlight systems, reliability and stability are crucial. The fault detection and protection functions of TPS92662AQPHPRQ1 can monitor the working status of the LED drive circuit and take appropriate protective measures when a fault is detected to avoid potential damage, thus improving the reliability of the entire lighting system.

•Multi-channel support: The headlight system of some high-end cars may contain multiple LED light groups, such as high beam, low beam, turn signal, etc. The multi-channel driving capability of the TPS92662AQPHPRQ1 enables it to control these different LED light groups simultaneously, ensuring that they work together to provide the best lighting effect.

•Communication interface and integration: The serial interface and I2C communication interface of the TPS92662AQPHPRQ1 enable it to be easily integrated with other control systems of the vehicle. This allows developers to programmatically adjust the performance of LED headlights to work with other vehicle features such as adaptive headlight systems, high-beam assist, and more.

2.Front fog lamps: Front fog lamps provide additional lighting in foggy or bad weather, increasing the driver's visibility. TPS92662AQPHPRQ1 can be used to drive front fog lights to ensure efficient and reliable performance. Front fog lights play a vital role in severe weather conditions, such as fog, haze, rain, snow, etc. These weather conditions often limit the driver's sight distance and clarity, making it difficult to see the road ahead. In this case, the front fog lamp is able to penetrate fog and other suspended particles through its unique design, providing the driver with a longer viewing distance and a clearer road image. TPS92662AQPHPRQ1 is a driver chip specially designed for automotive lighting. It can provide stable current and voltage output for front fog lamps to ensure the stability of light brightness and color temperature.

3.Daytime running lights: Modern cars are usually equipped with daytime running lights to enhance the visibility of driving during the day. TPS92662AQPHPRQ1 can be used to drive these daytime running lights, providing efficient lighting effects and supporting PWM dimming to adapt to different lighting needs. TPS92662AQPHPRQ1 is an LED matrix manager chip specially designed for automotive headlight systems with 12-channel high-brightness LED management capabilities. At the same time, it also uses EMI noise reduction technology. This chip is not only an automotive-grade LED driver chip, but also has a variety of functions such as high-precision current control, multi-channel drive, PWM dimming control, fault detection and protection, and temperature protection.

Ⅳ.How TPS92662AQPHPRQ1 realizes high-precision current control

TPS92662AQPHPRQ1 achieves high-precision current control through internal current sensors and feedback loops.

1.Feedback loop: The feedback loop inside the chip will adjust the output current based on the difference between the LED series current detected by the current sensor and the set value. By comparing the actual current with the desired current, the chip is able to achieve precise current control.

2.Current sensor: TPS92662AQPHPRQ1 has multiple built-in current sensors for monitoring LED series current. These sensors can detect the actual value of the LED series current and feed it back to the control circuit.

3.PWM dimming: In addition to current control, TPS92662AQPHPRQ1 also supports PWM dimming function. This enables the chip to adjust the brightness of the LED as needed, further increasing the precision and flexibility of the lighting system.

Ⅴ.Working principle of temperature sensor and temperature protection mechanism of TPS92662AQPHPRQ1

•Temperature Sensor

1.Temperature feedback loop: By connecting the temperature-sensitive circuit to the feedback loop, the chip can feed back temperature information to the control circuit. In this way, the system is able to monitor the temperature of the chip and take appropriate measures, such as reducing the current or reducing the operating frequency, as needed to prevent the chip from overheating.

2.Temperature-sensitive circuit: The chip integrates some temperature-sensitive circuit components, such as thermistor or temperature sensor. The resistance of these circuit elements changes with temperature, allowing the chip to obtain temperature information by measuring the resistance.

3.Temperature protection mechanism: When the chip temperature exceeds the safe range, the temperature protection mechanism will be triggered, and the system will take corresponding protective measures to prevent the chip from overheating. This can include reducing output power, stopping output, etc. to reduce chip temperature.

•Temperature protection mechanism

1.Temperature protection trigger: When the chip temperature is detected to exceed the set safety range, the temperature protection mechanism will be triggered. Typically, this safe temperature range is preset and lies within the temperature range at which the chip can operate safely.

2.Temperature monitoring: The temperature sensor built into the chip will continuously monitor the temperature of the chip. These sensors can sense temperature changes on the surface of the chip and pass the temperature information to the control circuit.

3.Temperature recovery: Once the chip temperature returns to a safe range, the temperature protection mechanism will be automatically lifted and the LED driver will resume normal operation.

4.Protection measures: Once the temperature protection mechanism is triggered, the system will take a series of protective measures to reduce the temperature of the chip to prevent damage to the chip.

Ⅵ.How to perform PWM dimming control through TPS92662AQPHPRQ1

1.Connect the PWM signal: Connect the PWM dimming signal to the PWM pin of TPS92662AQPHPRQ1. The PWM signal is usually generated by a microcontroller or other dimming controller.

2.Enable the chip: Connect the enable signal to the EN pin of TPS92662AQPHPRQ1 and set it to high level to enable the chip.

3.Set PWM dimming parameters: control the brightness of the LED through the duty cycle of the PWM signal. The duty cycle represents the ratio of the high level duration of the PWM signal to the cycle time. A higher duty cycle will cause the LED brightness to increase, while a lower duty cycle will cause the LED brightness to decrease.

4.Adjust PWM frequency: Adjust the frequency of PWM signal as needed. Higher PWM frequencies generally produce a smoother dimming effect, while lower PWM frequencies may cause LED flickering or visible dimming effects.

5.Monitor LED brightness: Monitor the brightness of the LED in the application and adjust the parameters of the PWM signal as needed to achieve the required lighting effect.

Ⅶ.Fault detection and protection functions of TPS92662AQPHPRQ1

1.Short circuit protection: When a short circuit occurs in the LED series, TPS92662AQPHPRQ1 will detect it immediately and take measures to prevent the chip from overheating or damage. This is typically accomplished by detecting an abnormal increase in current at the ISEN pin that exceeds a set threshold.

2.Overcurrent protection: TPS92662AQPHPRQ1 has a built-in overcurrent protection function. When the LED series current exceeds the set threshold, the chip will take measures to limit the current and protect the LED from damage. This is typically accomplished by monitoring the current at the ISEN pin and comparing it to a set value.

3.Low voltage protection: When the input voltage is lower than the set minimum operating voltage, the chip will stop output to protect the system from damage. This is usually accomplished by monitoring the voltage at the VIN pin and comparing it to a set value.

4.Over-temperature protection: TPS92662AQPHPRQ1 has a built-in temperature sensor that can monitor the temperature of the chip. When the temperature exceeds the set safety range, the chip will take measures to limit power or reduce operating frequency to prevent the chip from overheating.

5.Feedback loop fault protection: If there is a fault in the feedback loop, such as an abnormality or failure of the PWM input signal, TPS92662AQPHPRQ1 will take measures to stop the output of the LED to prevent the LED from working abnormally or being damaged.

Ⅷ.Simplified Application of TPS92662AQPHPRQ1

Ⅸ.Alternate model of TPS92662AQPHPRQ1

•TPS92660
•TPS92662A
•TPS92661
•TPS92662

Frequently Asked Questions

1.How many LED driving channels does TPS92662AQPHPRQ1 support?
TPS92662AQPHPRQ1 is a single-channel LED driver that only supports the driving of a single LED in series. Therefore, it only provides one LED driving channel. If you need to drive multiple LEDs in series, you need to use multiple TPS92662AQPHPRQ1 or choose other LED drivers with multi-channel capabilities.

2.What type of input voltage does TPS92662AQPHPRQ1 support?
TPS92662AQPHPRQ1 typically supports a wide input voltage range suitable for automotive applications, such as 6V to 42V.

3.How does TPS92662AQPHPRQ1 achieve high-precision current control?
TPS92662AQPHPRQ1 achieves high-precision current control through internal current sensing and feedback mechanisms, which monitor and adjust the LED current based on the desired setpoint.

4.How does TPS92662AQPHPRQ1 implement PWM dimming control?
TPS92662AQPHPRQ1 implements PWM dimming control by accepting a PWM signal at its PWM pin, which controls the LED brightness by modulating the duty cycle of the PWM signal.