The model you provided, "TPS61165DRVR," is a product from Texas Instruments (TI). It is a specific IC that deals with LED drivers, and its application often includes boosting voltage for efficient driving of LEDs in various lighting systems. Let’s break down the pin functions and specifications as requested:
Pin Function Specifications
Package Type: The TPS61165DRVR comes in a TSSOP-20 package, which means it has 20 pins in total.
Here is a detailed breakdown of the pin functions for this device:
Pin Number Pin Name Pin Function 1 SW1 Switch node for the first stage of the converter. Connect to the external inductor for proper functioning of the boost converter. 2 SW2 Switch node for the second stage of the converter. This is connected to another inductor if there is a two-stage design. 3 VIN Input voltage pin. Supplies the input voltage to the IC. 4 VOUT Output voltage pin. The output voltage that drives the LED(s) is provided from here. 5 PGND Power ground for the switching nodes. 6 EN Enable pin. This pin must be high for the IC to operate. If low, the device is in a disabled state. 7 ISET Current setting pin. An external resistor is placed between this pin and ground to set the desired LED current. 8 VREF Reference voltage output. This provides a fixed reference voltage for other parts of the circuit. 9 IOUT Output current feedback pin. It senses the current flowing to the LED. 10 FB1 Feedback pin for the first stage of the converter. Used to regulate the voltage at the output. 11 FB2 Feedback pin for the second stage of the converter. Similarly used to regulate the output voltage in a two-stage design. 12 FREQ Frequency setting pin. External components can be used to set the operating frequency of the converter. 13 RT Timing resistor pin. Used to set the switching frequency by connecting a resistor to ground. 14 COMP Compensation pin for feedback loop stability. Typically connected to a capacitor or resistor network. 15 VDD Power supply pin for internal circuits of the IC. 16 SDA I2C data line for Communication with a microcontroller or external devices. 17 SCL I2C clock line for communication with a microcontroller or external devices. 18 NC No connection. This pin should be left unconnected. 19 PGND Ground for the power stage of the IC. 20 NC No connection. This pin should be left unconnected.General Circuit Principles
The TPS61165DRVR is an integrated high-efficiency boost converter designed for LED driving applications. Here are its basic circuit principles:
Boost Converter: The IC operates as a boost converter, which steps up the input voltage to a higher level to drive LEDs. Current Regulation : It ensures that the current flowing through the LEDs is regulated accurately by using a feedback loop and external current sense resistor. Switching Frequencies: The IC allows flexibility in setting the operating switching frequency using an external resistor. PWM Control: It employs Pulse Width Modulation (PWM) control to regulate the LED current and adjust brightness levels. I2C Communication: The device has an I2C interface for configuration and adjustment, allowing for easy integration into more complex systems. Thermal Protection: The IC is designed with thermal shutdown protection, ensuring it does not overheat during operation.20 Frequently Asked Questions (FAQs)
Q: What is the input voltage range for the TPS61165DRVR? A: The input voltage range for the TPS61165DRVR is 4.5V to 16V.
Q: How do I set the LED current in the TPS61165DRVR? A: The LED current is set by placing a resistor between the ISET pin and ground.
Q: Can the TPS61165DRVR be used for multiple LEDs? A: Yes, the TPS61165DRVR can drive multiple LEDs connected in series, provided the total forward voltage does not exceed the output voltage of the IC.
Q: How do I enable the TPS61165DRVR? A: The TPS61165DRVR is enabled by applying a high logic signal to the EN pin.
Q: What happens if the TPS61165DRVR is overheated? A: The IC has built-in thermal shutdown protection that will turn the device off if the temperature exceeds safe operating limits.
Q: What is the purpose of the FB pins in the TPS61165DRVR? A: The FB pins are feedback pins used to regulate the output voltage in a two-stage design by comparing the output voltage to a reference.
Q: Can the TPS61165DRVR be used without I2C communication? A: Yes, I2C communication is optional, and the device can be operated without it by simply setting the correct resistor values for current and frequency.
Q: What is the maximum output voltage for the TPS61165DRVR? A: The maximum output voltage for the TPS61165DRVR is 60V.
Q: Can I use the TPS61165DRVR for dimming control? A: Yes, you can control the LED brightness using PWM dimming via the I2C interface or external circuitry.
Q: What is the switching frequency range for the TPS61165DRVR? A: The switching frequency range is typically between 100 kHz to 1 MHz, depending on external components.
Q: How should I connect the output current sensing resistor for the TPS61165DRVR? A: The output current sensing resistor should be connected between the IOUT pin and ground to monitor the LED current.
Q: What is the thermal shutdown temperature for the TPS61165DRVR? A: The thermal shutdown temperature for the TPS61165DRVR is approximately 150°C.
Q: Can the TPS61165DRVR be used for automotive applications? A: Yes, the TPS61165DRVR is suitable for automotive applications as it can handle input voltages up to 16V and has protection features.
Q: What type of inductors are compatible with the TPS61165DRVR? A: The TPS61165DRVR works well with inductors in the range of 4.7 µH to 10 µH, depending on your design.
Q: How can I reset the TPS61165DRVR? A: The TPS61165DRVR can be reset by pulling the EN pin low and then high again.
Q: Does the TPS61165DRVR support dimming via analog voltage? A: Yes, analog dimming is possible by applying a voltage to the DIM pin, which adjusts the LED current.
Q: How does the TPS61165DRVR handle overcurrent conditions? A: The TPS61165DRVR will enter a fault condition and shut down or reduce output power if an overcurrent condition is detected.
Q: What is the output current range for the TPS61165DRVR? A: The output current range can be set from 50 mA to 1.5 A, depending on the external current sensing resistor.
Q: Is there a way to reduce the power consumption of the TPS61165DRVR? A: Yes, the IC features a low quiescent current and can be powered down by disabling the EN pin to reduce power consumption.
Q: How can I improve the stability of the feedback loop in the TPS61165DRVR? A: The loop stability can be improved by adjusting the compensation network on the COMP pin.
This comprehensive guide covers the pinout, specifications, and frequently asked questions for the TPS61165DRVR from Texas Instruments. If you have further queries or need additional details, feel free to ask!
