TPS61175PWPR Detailed explanation of pin function specifications and circuit principle instructions
The TPS61175PWPR is a Texas Instruments (TI) part number. It is a boost converter used for driving LED s. Below is a detailed breakdown of the requested information, as requested:
TPS61175PWPR Pin Function Specification & Circuit Principle Explanation
Brand: Texas Instruments Model Number: TPS61175PWPR Package Type: TSSOP-20 (20 pins)
Pin Function and Description for TPS61175PWPR (TSSOP-20 Package)
The TPS61175PWPR comes in a TSSOP-20 package, meaning it has 20 pins. Below is a detailed description of the function for each pin.
Pin Number Pin Name Pin Function Description 1 VDD Power Supply Input. The voltage is typically 3.0V to 5.5V. It powers the internal circuits of the IC. 2 SW Switch Pin. This pin is used to connect to the inductor in the boost converter circuit. 3 VOUT Output Voltage Pin. This pin delivers the output voltage to the load, typically used to drive LEDs. 4 FB Feedback Pin. Used for voltage feedback to regulate the output voltage. 5 GND Ground Pin. The common reference for all signals and voltage levels within the IC. 6 EN Enable Pin. This pin is used to turn the IC on or off. A high signal enables the device, while a low signal disables it. 7 DIM Dimming Pin. Used for controlling the brightness of the connected LEDs by adjusting the duty cycle. 8 FSEL Frequency Selection Pin. Determines the switching frequency of the internal oscillator. 9 SS Soft Start Pin. Used to limit the inrush current when the device is powered on. 10 PGND Power Ground Pin. Provides a low-impedance path for the power ground. 11 COMP Compensation Pin. Used to stabilize the control loop of the IC and improve transient response. 12 C1 capacitor Pin. Used for connecting an external capacitor to improve stability and noise immunity. 13 C2 Capacitor Pin. Another external capacitor connection for stability. 14 R1 Resistor Pin. Used for connecting a resistor for specific internal circuit adjustments. 15 R2 Resistor Pin. Another resistor connection for tuning specific functions. 16 RT Timing Resistor Pin. Used to set the timing functions such as switching frequency or other internal timing-related features. 17 DRV Driver Pin. Provides drive voltage to an external transistor for controlling the switch. 18 VREF Reference Voltage Pin. Supplies a stable reference voltage for feedback regulation and other reference requirements. 19 VDDI Input Supply Voltage Pin for internal circuits or additional low-power components. 20 VOUT_CAP Output Capacitor Pin. Provides a connection for output capacitors that filter the output signal and stabilize the output voltage.Frequently Asked Questions (FAQ) - TPS61175PWPR
Q: What is the input voltage range for the TPS61175PWPR? A: The input voltage range is 3.0V to 5.5V.
Q: Can the TPS61175PWPR be used to drive a single LED? A: Yes, it can drive LEDs with a regulated output voltage, typically used in single or multiple LED configurations.
Q: What is the switching frequency of the TPS61175PWPR? A: The default switching frequency is adjustable through the FSEL pin and is typically in the range of 200kHz to 1.2MHz.
Q: How do I enable the TPS61175PWPR? A: The EN pin must be pulled high (greater than 1.5V) to enable the device.
**Q: What is the function of the *DIM* pin?** A: The DIM pin is used to control the brightness of the connected LEDs through dimming control by adjusting the duty cycle.
Q: Can the TPS61175PWPR be used in a battery-powered system? A: Yes, it is suitable for battery-powered systems as it operates with input voltages as low as 3.0V.
Q: How does the feedback mechanism work in the TPS61175PWPR? A: The feedback pin (FB) is used to sense the output voltage, and the IC adjusts the output to maintain a stable voltage based on this feedback.
Q: What type of Inductors should be used with the TPS61175PWPR? A: Inductors with low resistance, high current handling capacity, and appropriate inductance values (typically 10µH to 22µH) are recommended.
**Q: What happens if the *GND* pin is not connected correctly?** A: Incorrect grounding can cause improper operation, instability, or failure to regulate the output voltage properly.
**Q: What is the role of the *SW* pin?** A: The SW pin is connected to the switching transistor of the IC and controls the inductor's current flow for boosting the input voltage.
Q: How do I set the switching frequency of the TPS61175PWPR? A: The switching frequency can be adjusted by selecting appropriate resistors for the RT pin, or by using the FSEL pin to select predefined frequencies.
Q: Can I use the TPS61175PWPR for other power conversion applications? A: While primarily designed for LED driving, it can also be adapted for general-purpose boost converter applications within the input voltage and current limits.
Q: What are the thermal considerations for using the TPS61175PWPR? A: Ensure proper thermal management through sufficient PCB copper area, and use a heatsink if necessary to avoid overheating during high power operation.
Q: What is the recommended operating temperature for the TPS61175PWPR? A: The recommended operating temperature range is from -40°C to +125°C.
Q: How do I protect the circuit against overcurrent conditions? A: Proper external components, such as current-limiting resistors and inductors with adequate current ratings, should be selected to protect against overcurrent.
Q: Is the TPS61175PWPR RoHS compliant? A: Yes, the TPS61175PWPR is RoHS compliant, meaning it is free from hazardous substances like lead.
**Q: Can the device be damaged if the *EN* pin is left floating?** A: It is recommended not to leave the EN pin floating. It should either be driven high to enable the IC or low to disable it.
**Q: What is the purpose of the *COMP* pin?** A: The COMP pin is used for external compensation to ensure stability in the control loop and improve transient response.
Q: How do I adjust the output voltage of the TPS61175PWPR? A: The output voltage is set by selecting an appropriate resistor divider connected to the FB pin, based on the desired output voltage.
Q: Can the TPS61175PWPR be used in parallel for higher power applications? A: The device is not specifically designed for parallel operation, but it can be used in configurations where current sharing is managed through external circuitry.
This detailed explanation provides the pin function specification, circuit principle, and usage guidance for the TPS61175PWPR from Texas Instruments. The FAQs cover common concerns related to application and operation of the part.
