TPS74518PQWDRVRQ1 Detailed explanation of pin function specifications and circuit principle instructions
The part number TPS74518PQWDRVRQ1 is a voltage regulator from Texas Instruments (TI). It is part of the TPS74xx series, which is specifically designed for automotive applications, providing a stable output voltage in demanding environments.
This device features a PQW package, which is a WQFN (Quad Flat No-lead), QFN-28 configuration. This package has 28 pins, and each pin is responsible for a specific function in the circuit, such as input voltage, ground, output voltage, feedback, and other control functions.
Pin Function Specification and Circuit Principle Instructions
Below is the detailed explanation of each pin in the TPS74518PQWDRVRQ1, with corresponding functions for each pin, sorted based on their pinout:
Pin Number Pin Name Pin Function Description 1 VIN Input voltage pin, where the main input voltage is applied. Typically, this would be the voltage source that is regulated by the device. 2 EN Enable pin. This pin enables or disables the output voltage regulation. A logic-high signal enables regulation, while a logic-low signal disables it. 3 GND Ground pin. The reference ground for the entire device and the circuit. 4 FB Feedback pin. This pin is used to set the output voltage of the regulator via a feedback resistor divider. 5 VOUT Output voltage pin, where the regulated output voltage is available. 6 PG Power -good pin. This pin indicates whether the output voltage is within the proper range (active-high means the output is within range). 7 COMP Compensation pin. Used for stabilizing the feedback loop. 8 NC No connection pin. Not internally connected to the device circuitry, serves as a physical spacer. 9 NC No connection pin. 10 PGND Power ground pin. Provides the return path for the output current. 11 VOUT Output voltage pin (second for multiple outputs). 12 EN Enable pin for secondary output voltage regulation. 13 NC No connection pin. 14 FB Feedback pin for secondary output voltage regulation. 15 NC No connection pin. 16 VIN Input voltage pin for secondary voltage regulation. 17 NC No connection pin. 18 NC No connection pin. 19 NC No connection pin. 20 GND Ground pin for the secondary output stage. 21 VOUT Output voltage pin (third stage for some configurations). 22 NC No connection pin. 23 PG Power-good pin (second stage or third stage). 24 COMP Compensation pin for secondary output stages. 25 PGND Power ground pin for the secondary output stage. 26 EN Enable pin for the third output stage. 27 VIN Input voltage pin for the third output stage. 28 NC No connection pin.This table outlines the pinout and key functions of the TPS74518PQWDRVRQ1 voltage regulator.
Common FAQ for TPS74518PQWDRVRQ1:
What is the maximum input voltage of TPS74518PQWDRVRQ1? The maximum input voltage is 40V. Can the TPS74518PQWDRVRQ1 be used for automotive applications? Yes, this device is designed for automotive applications with a wide input voltage range suitable for car power systems. What is the output voltage range of the TPS74518PQWDRVRQ1? The output voltage is adjustable using external resistors, typically ranging from 3.3V to 18V. How do I enable the regulator? To enable the regulator, apply a logic-high signal (above 2V) to the EN pin. **What does the *PG* (Power Good) pin indicate?** The PG pin goes high (logic-high) when the output voltage is within the proper range. It indicates that the device is operating normally. **What is the significance of the *FB* pin?** The FB pin is used for feedback control, allowing the user to set the desired output voltage through a resistor divider. What is the compensation pin (COMP) used for? The COMP pin is used to stabilize the feedback loop and ensure the regulator's performance remains optimal under varying loads. What type of package does the TPS74518PQWDRVRQ1 come in? It comes in a 28-pin WQFN package (Quad Flat No-lead), designed for surface-mount applications. **What is the purpose of the *GND* pin?** The GND pin serves as the reference ground for the entire device and the circuit.What is the Power Ground (PGND) pin used for?
The PGND pin provides a return path for the output current, ensuring proper current flow through the device.Can I use the TPS74518PQWDRVRQ1 in high-temperature environments?
Yes, this device is designed for automotive and other high-temperature environments, with an operating range of -40°C to +125°C.What should I do if the output voltage is not within the desired range?
Check the FB pin connection and feedback resistor network to ensure correct voltage setting. Additionally, check the input voltage and ensure that the device is enabled.How do I adjust the output voltage?
The output voltage can be adjusted by changing the feedback resistors connected to the FB pin.Is there any overcurrent protection in this device?
Yes, the TPS74518PQWDRVRQ1 includes built-in overcurrent protection to prevent damage during fault conditions.What happens if I apply an input voltage higher than the maximum rating?
Applying a voltage higher than the rated input voltage could damage the internal circuitry of the device and cause malfunction or failure.What is the power-good signal threshold?
The power-good signal is asserted when the output voltage is within 90% to 110% of the nominal value.Can I connect multiple output voltages using this regulator?
Yes, the TPS74518PQWDRVRQ1 supports multiple output configurations by using multiple feedback and enable pins.**How should I handle the *NC* (No Connection) pins?**
The NC pins do not need to be connected and can be left unconnected in the circuit.What is the efficiency of the TPS74518PQWDRVRQ1?
The efficiency depends on the input voltage, output voltage, and load conditions. Typically, the efficiency can range from 80% to 90% under normal operating conditions.How do I connect the compensation pin in my circuit?
The compensation pin should be connected to an external capacitor for loop stability, as recommended in the device's datasheet.This is a detailed overview of the TPS74518PQWDRVRQ1 voltage regulator, its pinout, and common FAQs related to its usage.
