The part number "TPS54620RGYR" corresponds to a DC-DC buck converter from Texas Instruments. Below, I’ll provide an explanation of the pin functions, circuit principles, pinout details, a comprehensive list of all pins with their functions, and 20 frequently asked questions (FAQ) about the part.
1. Pin Function Specifications and Circuit Principles of TPS54620
The TPS54620 is a 60V, 20A output, step-down regulator in a QFN-24 package, and is designed for high efficiency, high output Power applications such as power supplies for industrial systems, telecom equipment, or networking devices.
2. Package Type and Pin Count
The part number TPS54620RGYR comes in a QFN-24 package, which contains 24 pins in total.
3. Pinout and Pin Function List for the TPS54620
Below is a comprehensive description of each of the 24 pins in the QFN-24 package of the TPS54620.
Pin # Pin Name Function Description 1 VIN Power Supply Input: This is the input voltage to the regulator. It should be connected to the source of power (e.g., 12V or 5V). 2 SW Switch Node: This is the switching node of the DC-DC converter. It connects to the inductor and is used for energy transfer during the switching cycle. 3 PGND Power Ground: The return path for the power stage and switching components. 4 VOUT Output Voltage: This is the regulated output voltage of the DC-DC converter. 5 SGND Signal Ground: The return path for the low-voltage signal side. It should be kept separate from the power ground (PGND) to minimize noise coupling. 6 FB Feedback: The voltage feedback pin used to regulate the output voltage. A resistor divider is usually connected between VOUT and FB to set the desired output voltage. 7 EN Enable: This pin enables or disables the DC-DC converter. A high signal enables the converter, and a low signal disables it. 8 SS/TR Soft Start/Tracking: Controls the soft-start function of the converter, helping to limit inrush current at power-up. Can also be used for tracking multiple outputs. 9 VREF Reference Voltage: Provides a stable reference voltage for the feedback loop. 10 COMP Compensation: The external compensation network is connected here to stabilize the feedback loop and improve transient response. 11 NC No Connect: This pin is not internally connected and has no function in the circuit. It can be left floating or connected to ground. 12 PG Power Good: Indicates whether the output voltage is within the acceptable range. A high signal indicates good operation, while a low signal indicates a fault. 13 RT/CLK Resistor or Clock : This pin is used for external resistor setting of the switching frequency or for clock synchronization when configured. 14 VDD Voltage Reference : This pin supplies power to the internal control circuitry and should be tied to the same voltage rail as the logic side. 15 VOUT_POK Output Power OK: Indicates that the output is stable and within acceptable voltage range, usually used for monitoring purposes. 16 ISEN+ Current Sense Positive: Connects to the current sensing resistor to monitor the output current, used for overcurrent protection and regulation. 17 ISEN- Current Sense Negative: Complements ISEN+ to complete the current sense circuit for accurate monitoring and regulation. 18 RT/CLK Timing /Clock: Used for external clock synchronization or to set the switching frequency. 19 PGND Power Ground: Another power ground pin for the return path of the power side components. 20 VCC Output Voltage Supply: Provides a supply to the internal control circuit to ensure proper operation. 21 TSD Thermal Shutdown: Provides an indication if the device has entered thermal shutdown due to excessive temperature. 22 OVP Overvoltage Protection: This pin triggers the overvoltage protection circuit when the output voltage exceeds the set threshold. 23 LDRV Low-Side Driver: Drives the low-side MOSFET to switch the inductor current. 24 HDRV High-Side Driver: Drives the high-side MOSFET to allow for voltage conversion.4. 20 Frequently Asked Questions (FAQ)
Here are 20 commonly asked questions about the TPS54620:
Q: What is the input voltage range for the TPS54620? A: The input voltage range for the TPS54620 is 4.5V to 60V.
Q: What is the output current capability of the TPS54620? A: The TPS54620 can deliver up to 20A of output current.
Q: What type of packaging is used for the TPS54620? A: The TPS54620 comes in a QFN-24 package.
Q: How is the output voltage regulated in the TPS54620? A: The output voltage is regulated through a feedback pin (FB), where a resistor divider sets the output voltage.
Q: Can I use the TPS54620 for 5V and 12V systems? A: Yes, the TPS54620 can be used for both 5V and 12V systems, as its input voltage range supports both.
Q: Does the TPS54620 have overcurrent protection? A: Yes, it has current sensing pins (ISEN+ and ISEN-) for overcurrent protection.
Q: What is the function of the "Enable" pin on the TPS54620? A: The "Enable" pin controls whether the device is powered on or off. A high signal enables the device, and a low signal disables it.
Q: How does the TPS54620 handle thermal protection? A: The TPS54620 has an internal thermal shutdown feature that activates when the junction temperature exceeds a preset threshold.
Q: What is the purpose of the "Power Good" pin (PG) on the TPS54620? A: The PG pin indicates whether the output voltage is within the acceptable range, signaling the status of the converter.
Q: Can the TPS54620 be synchronized to an external clock? A: Yes, the RT/CLK pin allows the TPS54620 to be synchronized to an external clock.
Q: What is the soft-start feature in the TPS54620? A: The soft-start feature (SS/TR) limits inrush current during startup to prevent damage to components.
Q: How does the TPS54620 handle overvoltage conditions? A: The TPS54620 includes overvoltage protection via the OVP pin, which triggers a fault condition if the output voltage exceeds a safe threshold.
Q: What is the switching frequency of the TPS54620? A: The switching frequency of the TPS54620 can be set externally via the RT pin.
Q: What is the minimum output voltage that the TPS54620 can achieve? A: The TPS54620 can output voltages as low as 0.8V.
Q: Can I use the TPS54620 in applications with high load transients? A: Yes, the TPS54620 is designed for applications with high load transients, thanks to its fast transient response and compensation network.
Q: What is the role of the VDD pin? A: The VDD pin provides a supply voltage to the internal control circuitry of the TPS54620.
Q: Is the TPS54620 suitable for telecom applications? A: Yes, the TPS54620 is suitable for telecom and networking applications due to its high efficiency and wide input voltage range.
Q: What is the function of the low-side and high-side drivers (HDRV and LDRV)? A: These drivers control the high-side and low-side MOSFETs , respectively, for the switching operation of the converter.
Q: Can the TPS54620 be used in automotive applications? A: Yes, the TPS54620 can be used in automotive applications, as it supports a wide input voltage range suitable for automotive systems.
Q: How does the TPS54620 handle power sequencing for multi-output systems? A: The TPS54620 includes a tracking feature on the SS/TR pin to synchronize the startup of multiple outputs in power sequencing systems.
This covers the detailed pinout, function, and the FAQ for the TPS54620RGYR. Let me know if you need further details or more specific information.