The TPS61165DBVR is a product manufactured by Texas Instruments (TI). It is a high-efficiency boost converter primarily used for Power ing LED s and other electronic components in various applications like backlighting and other power supply systems. Below, I will provide a detailed explanation of its pin function specifications, circuit principle instructions, and a complete list of pin functions. I'll also cover frequently asked questions related to this component.
Package Type:
TPS61165DBVR is housed in a VQFN-20 package, which has 20 pins.Pinout Table:
Here is the pinout with the pin number, function, and description:
Pin Number Pin Name Pin Function 1 GND Ground pin. Used to reference the circuit to ground. Connect to the system ground. 2 SW1 Switch node for the main power transistor . This is where the inductor is connected to the switch of the converter. 3 SW2 Switch node for the second power transistor. It connects to the second inductor for boosting the voltage further. 4 VIN Input voltage pin. Connect this to the positive terminal of the power source. 5 VOUT Output voltage pin. It connects to the output load, such as the LED, and provides the regulated voltage. 6 EN Enable pin. Used to turn the device on or off. A high level enables the device, while a low level disables it. 7 REF Reference voltage output pin. Provides a reference voltage to set the LED current. 8 COMP Compensation pin. Used for compensating the feedback loop to stabilize the converter’s operation. 9 FB Feedback pin. Connects to the feedback resistor divider to regulate the output voltage. 10 PGND Power ground pin. Provides a separate ground return path for high-current components like the power switch. 11 ISEN+ Current sense positive input. This pin measures the current flowing through the inductor to regulate the current. 12 ISEN- Current sense negative input. Complements ISEN+ to measure current through the inductor. 13 LX1 Inductor connection for the first stage of the boost converter. 14 LX2 Inductor connection for the second stage of the boost converter. 15 VCC Supply voltage pin for internal control circuitry. Typically connected to the input voltage. 16 DNC Do not connect pin. This pin should be left floating and should not be connected to any circuit. 17 NC No connection pin. This pin has no internal connection to the circuitry. 18 ALERT Alert pin. Provides feedback in case of fault conditions, like overvoltage, undervoltage, or overcurrent. 19 VDD Supply voltage for logic and control circuitry. 20 VSS System ground. It is the common ground for the internal circuitry.Circuit Principle:
The TPS61165 is a boost converter that steps up the input voltage to a higher output voltage suitable for driving LEDs. The basic working principle of this circuit involves the following steps:
Switching Operation: The boost converter works by rapidly switching the input voltage through inductors (connected to the SW1 and SW2 pins), which stores energy in magnetic fields and releases it as a higher voltage across the output.
Control Feedback: The feedback loop, consisting of the FB pin and the COMP pin, regulates the output voltage by comparing the output voltage to a reference value and adjusting the switching duty cycle to maintain a stable output.
Current Sensing: The ISEN+ and ISEN- pins are used for current sensing to monitor the inductor current and ensure that it doesn’t exceed the safe operating limits. This helps in controlling the LED current accurately.
Enable/Disable Control: The EN pin allows the entire IC to be enabled or disabled depending on the logic level applied to it. This is typically used to control the converter based on the application needs.
Alert Output: The ALERT pin provides a signal if the converter encounters fault conditions such as overcurrent, overvoltage, or undervoltage.
Frequently Asked Questions (FAQs):
What is the input voltage range for the TPS61165DBVR? The input voltage range for the TPS61165DBVR is typically 3V to 6V. How do I enable the TPS61165DBVR? To enable the TPS61165DBVR, apply a high voltage (above the threshold) to the EN pin. A low voltage will disable the device. What is the maximum output voltage? The TPS61165DBVR can output up to 36V, depending on the external components and load conditions. Can the output voltage be adjusted? Yes, the output voltage is adjustable via the feedback network connected to the FB pin. What is the switching frequency of the TPS61165DBVR? The switching frequency is typically 600 kHz. How do I calculate the required inductance for the circuit? The inductance is determined based on the input voltage, output voltage, and the current requirements of the application. A typical value might be in the range of 10 µH to 22 µH. Can I use the TPS61165DBVR to drive multiple LEDs? Yes, you can use it to drive multiple LEDs as long as the total current drawn by the LEDs does not exceed the maximum current rating of the device. What is the recommended capacitor value for stability? A 22 µF ceramic capacitor is typically recommended for the input and output filtering. How does the current sensing feature work? The current sense pins (ISEN+ and ISEN-) monitor the current through the inductor. The device regulates the current based on this feedback to ensure proper operation and avoid overcurrent conditions. What are the power consumption characteristics of the TPS61165DBVR? The device has low quiescent current, typically around 100 µA, making it efficient for battery-powered applications. Can I use this device in automotive applications? Yes, the TPS61165DBVR is designed for a wide range of applications, including automotive. Ensure that the input voltage is within the specified range. What should I do if the ALERT pin indicates a fault? If the ALERT pin signals a fault, you should check for overcurrent, overvoltage, or undervoltage conditions and ensure that the input voltage and output current are within safe limits. Can I use the EN pin for remote on/off control? Yes, the EN pin can be used for remote on/off control by applying a logic level signal. What is the thermal shutdown feature of the TPS61165DBVR? The TPS61165DBVR includes a thermal shutdown feature that disables the device if the junction temperature exceeds safe operating limits, typically 150°C. What is the maximum output current for the TPS61165DBVR? The maximum output current depends on the thermal conditions and the specific application, but it can typically handle up to 2A. Can I connect the SW1 and SW2 pins to a single inductor? No, the SW1 and SW2 pins must be connected to separate inductors for optimal performance. How do I protect the circuit from overvoltage? The overvoltage condition is monitored via the feedback pin. You can use a zener diode or other protection circuit for additional safety. What type of external components should I use with the TPS61165DBVR? Use high-quality inductors, capacitors, and resistors designed for power electronics to ensure stability and performance. Can the TPS61165DBVR be used for non-LED applications? Yes, although it is optimized for LED driving, it can be used for other applications that require a regulated boost converter. What is the lifespan of the TPS61165DBVR? The lifespan is primarily determined by the thermal and electrical stresses. With proper design and thermal management, it can last for many years of operation.This is a comprehensive overview of the TPS61165DBVR including detailed pin functions, circuit operation principles, and FAQs. Let me know if you need further clarification!