TPS548A20RVER Detailed explanation of pin function specifications and circuit principle instructions

The part number "TPS548A20RVER" corresponds to a Texas Instruments (TI) product. It is a switching regulator IC, and its function is to provide step-down voltage conversion (buck conversion), which is a type of DC-DC converter used to step down a higher input voltage to a lower output voltage.

Packaging and Pin Count

The "RVER" suffix indicates the packaging type. For this specific part number, the package is typically VQFN (Very Thin Quad Flat No-lead), which is a leadless, surface-mount package. The part has a 20-pin configuration in this VQFN package.

Pin Function Specification and Explanation (20 Pins)

Here is the detailed description of the pins for the TPS548A20RVER (in a 20-pin VQFN package):

Pin Number Pin Name Pin Type Pin Function Description 1 VIN Input Input voltage pin. Connect to the input supply voltage for the DC-DC converter. 2 PGND Ground Power ground pin. Connect to the ground plane of the PCB. 3 SW Output Switch pin. Connect to the inductor for the step-down conversion. 4 EN Control Enable pin. A logic high turns the device on, a logic low disables it (low power state). 5 VOUT Output Output voltage pin. Connect to the output load to supply the regulated voltage. 6 FB Control Feedback pin. Used to sense the output voltage for regulation. 7 AGND Ground Analog ground pin. Typically connected to the ground plane. 8 PGOOD Output Power-good pin. This pin outputs a signal indicating the power is within regulation. 9 NC No Connect No connection pin. It is not connected to any internal circuitry. 10 BOOT Supply Bootstrapped supply pin for the high-side switch. Requires a capacitor . 11 VCC Supply Power supply pin for internal logic. Typically 5V or 3.3V depending on the application. 12 RT Control Timing resistor pin for setting the switching frequency. 13 COMP Control Compensation pin used for external compensation to optimize loop performance. 14 ILIM Control Current limit pin for setting the current limit threshold. 15 SS Control Soft-start pin to control the ramp-up time of the output voltage during startup. 16 CL Control Capacitor connection for the feedback loop. 17 DNC No Connect No connection pin. It is not internally connected. 18 FSW Output Switching frequency pin for monitoring or controlling the switching frequency. 19 CS Input Current sense pin to sense the inductor current for feedback regulation. 20 PGND Ground Power ground pin. Connect to the ground plane for proper operation of the power circuit.

Explanation of the Pin Functions

VIN: The input pin receives the power supply. The voltage level supplied to this pin is regulated to a lower voltage on the output side. PGND: The power ground connects the device to the common ground of the circuit. SW: The switching pin connects to the inductor. The device switches the voltage at this pin, providing the necessary energy transfer to the inductor and output. EN: This pin is used to enable or disable the device by applying a high or low voltage, respectively. VOUT: This pin is where the output voltage is provided to the load. FB: The feedback pin helps maintain regulation. It senses the output voltage through a feedback network and adjusts the operation of the device to keep the voltage stable. AGND: This is the analog ground, typically used for precision analog circuits within the device. PGOOD: This pin provides a logic signal that indicates whether the output voltage is within regulation. NC: This pin is not connected internally and has no function in the circuit. BOOT: This is the bootstrap pin used to supply the gate of the high-side MOSFET in a buck converter. VCC: This pin provides power to the internal control circuitry of the device. RT: The timing resistor connected here sets the switching frequency of the device. COMP: This is the compensation pin used to optimize the feedback loop for stability. ILIM: This pin is used to set the current limit for the switching regulator. It is typically used for protection purposes. SS: This pin controls the soft-start behavior of the device, preventing excessive inrush current when the regulator is powered on. CL: This is the capacitor connection for the control loop, affecting the transient response of the regulator. DNC: No connection. This pin is left floating and not used. FSW: This pin monitors the switching frequency of the device. CS: The current sense pin provides feedback on the current through the inductor, helping the device regulate power delivery. PGND: Another ground pin to ensure proper grounding for the power stage of the IC.

Frequently Asked Questions (FAQ)

What is the input voltage range for the TPS548A20RVER? The TPS548A20RVER operates with an input voltage range of 4.5V to 60V. What is the output voltage range of this IC? The output voltage can be adjusted between 0.8V and 15V. How do I set the switching frequency of the TPS548A20RVER? The switching frequency is set by connecting an external resistor between the RT pin and ground. Can I use the EN pin to enable/disable the IC? Yes, the EN pin allows you to enable or disable the device by applying a high or low logic signal. What is the maximum output current the TPS548A20RVER can provide? The maximum output current is 20A. How do I connect the feedback loop for the TPS548A20RVER? Connect a resistor network between the FB pin and the output to regulate the output voltage. What is the function of the BOOT pin? The BOOT pin is used to supply the high-side switch with a bootstrap capacitor for proper switching operation. What should I connect to the PGND and AGND pins? PGND is connected to the power ground, and AGND is connected to the analog ground of the circuit. Can I use the SS pin to control the startup of the converter? Yes, the SS pin allows you to control the soft-start behavior during power-up. What type of inductor should be used with the TPS548A20RVER? A suitable inductor must be chosen based on the desired output current, voltage ripple, and switching frequency. How do I calculate the external compensation for the feedback loop? External compensation is typically calculated based on the application’s requirements, and it ensures stable operation over the entire load range. Can I operate the TPS548A20RVER in parallel for higher current? Yes, the IC can be operated in parallel with proper layout and current sharing techniques. Is there overcurrent protection in the TPS548A20RVER? Yes, the IC includes built-in current limit protection to safeguard against excessive current. What is the maximum junction temperature for the TPS548A20RVER? The maximum junction temperature is 150°C. What type of feedback configuration is used in the TPS548A20RVER? The IC uses a voltage feedback loop to regulate the output voltage based on the feedback from the output. What is the purpose of the PGOOD pin? The PGOOD pin provides a signal indicating whether the output voltage is within regulation. How do I set the output voltage of the TPS548A20RVER? The output voltage is set by selecting an appropriate resistor divider network connected to the FB pin. Is the TPS548A20RVER suitable for automotive applications? Yes, the TPS548A20RVER is rated for automotive applications with wide input voltage ranges. Can I use the TPS548A20RVER in a system with high ripple requirements? Yes, the TPS548A20RVER can handle high ripple, especially with proper selection of the output capacitors and inductors. What is the efficiency of the TPS548A20RVER at full load? The efficiency is typically around 90% at full load, depending on the specific operating conditions and components used.

This detailed breakdown covers the pin functions, packaging details, and frequently asked questions for the TPS548A20RVER from Texas Instruments, providing a comprehensive overview for designers and engineers.