TPS54328DDAR Detailed explanation of pin function specifications and circuit principle instructions

The model number you provided, "TPS54328DDAR," is a product from Texas Instruments (TI), a leading company in the design and manufacture of semiconductors and other electronic components. The "TPS54328DDAR" is a switching regulator (specifically a 3-A, 28-V, step-down (buck) DC-DC converter).

This part comes in a QFN-20 package (20 pins). Below is a detailed explanation of the pin functions and a general circuit principle description. I'll also provide a complete and detailed list of the pin functions, along with a set of frequently asked questions (FAQ).

Pin Functions for TPS54328DDAR (QFN-20 Package)

Pin Number Pin Name Pin Function Description 1 VIN Input voltage pin. This pin is used to connect the input voltage source. The typical input voltage range is 4.5V to 28V. 2 EN Enable pin. This pin is used to enable or disable the device. A logic high signal (typically above 1.3V) enables operation. A logic low disables it. 3 PGND Power ground. This pin serves as the reference ground for the power section of the device. 4 SW Switch node. This is the output of the internal power MOSFET and connects to the external inductor. It is where the switching voltage is applied. 5 BOOT Bootstrap pin. This is used to provide the high-side MOSFET with a bootstrap voltage for proper operation. 6 COMP Compensation pin. This pin is used to add external components (such as a resistor and capacitor ) to adjust the control loop for stability. 7 FB Feedback pin. This is the input to the internal error amplifier, which is used to set the output voltage. The feedback voltage is compared to an internal reference. 8 VOUT Output voltage pin. This is where the regulated output voltage is available. 9 NC No connection. This pin is not internally connected to anything and can be left floating. 10 AGND Analog ground. This pin serves as the reference ground for the analog circuitry inside the device. 11 SS Soft-start pin. A capacitor connected to this pin sets the soft-start time, controlling the rise time of the output voltage during startup. 12 PG Power good pin. This is an open-drain output that signals the status of the output voltage. It goes low when the output voltage is out of regulation. 13 VCC Supply voltage pin. This pin provides the necessary voltage for the internal control circuitry of the device. 14 SYNC Synchronization pin. This pin can be used to synchronize the switching frequency to an external clock or another switching regulator. 15 TRK Tracking pin. Used for output voltage tracking when there is a need to control the sequence of voltages. 16 INTVCC Internal voltage regulator output pin. Provides the internal bias voltage for the control section. 17 RT External timing resistor pin. This pin sets the switching frequency of the device when connected to an external resistor. 18 CSH Current sense high. This pin is used to monitor the current through the high-side MOSFET for current-mode control. 19 CSL Current sense low. This pin is used to monitor the current through the low-side MOSFET for current-mode control. 20 REF Reference voltage output. This pin provides a reference voltage that can be used to drive external circuits.

Circuit Principle Overview:

The TPS54328DDAR is a buck converter designed to convert a higher input voltage to a lower, regulated output voltage. The device uses a pulse-width modulation (PWM) control scheme to efficiently convert energy. The feedback loop regulates the output voltage by comparing the feedback signal (FB) with a reference voltage (Vref). The internal MOSFETs are controlled by the PWM signal to regulate the output voltage according to the load requirements.

FAQs for TPS54328DDAR

What is the input voltage range for the TPS54328DDAR? The input voltage range for the TPS54328DDAR is 4.5V to 28V. How do I enable the TPS54328DDAR? To enable the device, apply a logic high signal (typically above 1.3V) to the EN pin. What is the function of the SW pin? The SW pin is the switch node, which connects to the external inductor. It is where the switching voltage is generated during operation. What is the role of the BOOT pin? The BOOT pin is used to supply the bootstrap voltage to the high-side MOSFET for proper operation. Can I use an external resistor to set the switching frequency? Yes, an external resistor can be connected to the RT pin to set the switching frequency of the device. What is the typical output voltage of the TPS54328DDAR? The output voltage is adjustable depending on the external feedback resistor divider network. The device can output a wide range of voltages, typically from 0.8V to 15V. What is the purpose of the COMP pin? The COMP pin is used for compensation to stabilize the control loop. An external resistor and capacitor network can be added to this pin. What is the significance of the PG pin? The PG pin is a power-good signal, which goes low when the output voltage is out of regulation. It provides feedback about the device's health. What is the recommended soft-start time for the TPS54328DDAR? The soft-start time can be controlled by selecting an appropriate capacitor for the SS pin, which determines the ramp-up time of the output voltage.

How do I handle the PGND pin?

The PGND pin should be connected to the power ground of the circuit to provide a stable reference for the device’s power section.

What is the maximum output current of the TPS54328DDAR?

The device can deliver up to 3A of continuous output current, depending on the input voltage and thermal conditions.

What is the function of the VOUT pin?

The VOUT pin is where the regulated output voltage is available. It connects to the load.

Can the TPS54328DDAR operate in parallel with other regulators?

Yes, the TPS54328DDAR can be synchronized with other devices via the SYNC pin to ensure phase alignment in multi-output systems.

What is the maximum operating temperature for the TPS54328DDAR?

The device operates within a temperature range of -40°C to 125°C, making it suitable for industrial and automotive applications.

What is the package type of the TPS54328DDAR?

The TPS54328DDAR comes in a 20-pin QFN package.

What is the maximum switching frequency for the TPS54328DDAR?

The maximum switching frequency for this device is 1 MHz, adjustable with an external resistor on the RT pin.

Is the TPS54328DDAR suitable for high-efficiency applications?

Yes, the TPS54328DDAR is designed for high efficiency, with a typical efficiency of up to 95% under optimal conditions.

Can I use the REF pin for external reference voltage?

Yes, the REF pin provides a 1.0V reference voltage for use in external circuits.

How do I connect the INTVCC pin?

The INTVCC pin connects to the internal voltage regulator output, which powers the internal control circuitry of the device.

What is the function of the SYNC pin?

The SYNC pin can be used to synchronize the switching frequency of the TPS54328DDAR with an external clock or another device.

This explanation covers the detailed pin functionality and FAQs. If you need further clarification or more specifics, feel free to ask!