TPS54331DR Converter Replacements, Characteristics, Applications and Other Details
29 December 2023
Ⅱ. Characteristics of TPS54331DR converter
Ⅲ. Technical parameters of TPS54331DR
Ⅳ. Typical application of TPS54331DR converter
Ⅴ. Programming the slow start time of TPS54331DR
Ⅵ. Pin configuration of TPS54331DR converter
Ⅶ. Common faults of TPS54331DR converter
The TPS54331DR is a synchronous step-down DC-DC converter produced by Texas Instruments. It is famous for its high efficiency, high precision, low noise and other characteristics, and is widely used in various application scenarios. In this article, we will delve into the specific features of TPS54331DR to enhance your comprehension and facilitate the effective application of this chip.
The TPS54331DR serves as a non-synchronous buck converter with a voltage input limit of 28V and a 3A output capacity. It incorporates a low RDS(on) high-side MOSFET and employs an automatically activated pulse-skipping Eco mode to enhance efficiency under light loads. In applications reliant on battery power, the device's 1µA shutdown supply current enables its utilization. The device employs current-mode control with internal slope compensation, streamlining external compensation calculations and minimizing component requirements. Additionally, it accommodates the use of ceramic output capacitors. To adjust the input undervoltage lockout hysteresis, a resistor divider can be implemented. The inclusion of overvoltage transient protection circuitry curtails voltage overshoot during startup and transient conditions. Therefore, TPS54331DR is widely used in power management, LED lighting, industrial automation, electric vehicle chargers and other application scenarios.
Alternatives and equivalents:
• TPS54331-Q1
• Wide input voltage range: It supports input voltage range from 4.5V to 28V.
• Adjustable output voltage: It can adjust the output voltage as needed, ranging from 0.8V to 15V.
• Space saving: TPS54331DR is a compact chip, and its small size allows it to occupy minimal space in limited board space. This makes it suitable for use in a variety of compact electronic products, especially in space-constrained applications.
• Integrated protection functions: TPS54331DR has built-in multiple protection functions, including over-current protection, over-temperature protection and short-circuit protection. These protection functions can effectively prevent the system or equipment from being damaged under abnormal circumstances and ensure its safe and stable operation. In the event of overcurrent, TPS54331DR can automatically adjust the output current to avoid equipment damage caused by excessive current. In the event of over-temperature, the chip will automatically reduce power consumption to avoid device performance degradation or burnout caused by excessive temperature. In the event of a short circuit, the TPS54331DR can respond quickly and automatically shut down the output to prevent further damage caused by the short circuit.
• High efficiency: TPS54331DR adopts constant frequency current mode control technology, which can achieve conversion efficiency of up to 95% within a wide input voltage range, effectively reducing energy loss.
• Other features: In addition, TPS54331DR also has an input undervoltage shutdown function, which can automatically shut down the output when the voltage is too low, effectively protecting circuit safety. In addition, it also has soft-start characteristics, which can start smoothly and reduce the impact on the circuit.
• It is packaged in SOIC-8.
• TPS54331DR has an efficiency of up to 95%.
• Its output current is 3A.
• Its switching frequency reaches 500kHz.
• Its operating temperature range is -40°C to 125°C.
• Its input voltage range is 4.5V to 28V.
• Its output voltage range is 0.8V to 22V.
TPS54331DR is commonly used in the following fields:
• Communication device
• Power adapter
• Vehicle electronics
• Embedded systems
• Automated industry
• Battery powered system
Typical applications of TPS54331DR are shown in the figure below:
Formula calculation:
Among them, Vref is 0.8V and Iss is 2μA. The slow start time must be set between 1ms and 10ms to ensure good startup performance. Additionally, the value of the slow-start capacitor must not exceed 27nF. During normal device operation, the TPS54331DR will stop switching if the input voltage drops below the VIN UVLO threshold, or the EN pin is pulled below 1.25V, or a thermal shutdown event occurs.
The SS pin to ground capacitor achieves slow start-up time. The TPS54331 device has an internal pull-up current source of 2µA that is used to charge the external slow-start capacitor. We can use the equation to calculate the slow start time (10% to 90%) and adjust the capacitor value accordingly based on the desired time.
As shown in the figure, TPS54331DR has eight pins and is packaged in SOIC. Among them, its pin name and description are as follows.
Pin 1 (BOOT): A 0.1-uF bootstrap capacitor is required between the BOOT and PH pins. lf the voltage on this capacitor falls below the minimum requirement, the high-side MOSFET is forced to switch off until the capacitor is refreshed.
Pin 2 (VIN): This pin is the 3.5-V to 28-V input supply voltage.
Pin3 (EN): This pin is the enable pin. To disable, pull below 1.25 V. Float this pin to enable. Programming the input undervoltage lockout with two resistors is recommended.
Pin 4 (SS): This pin is slow-start pin. An external capacitor connected to this pin sets the output rise time.
Pin 5 (VSENSE): This pin is the inverting node of the transconductance (gm) error amplifier.
Pin 6 (COMP): This pin is the error-amplifier output and the input to the PWM comparator. Connect frequency compensation components to this pin.
Pin 7 (GND): Ground pin
Pin 8 (PH): The PH pin is the source of the internal high-side power MOSFET.
The TPS54331DR exhibits various issues, including but not restricted to the following:
1. Damage to circuit components: If the resistors, capacitors, transistors and other components in the TPS54331DR circuit are damaged, it may cause a power failure and cause the device to fail to work properly. In order to ensure the stable operation of the equipment, we should regularly check whether the components in the circuit are working properly and replace damaged components in time.
2. The power supply is overheated: If the power supply is overheated, it may be due to poor heat dissipation or excessive load on the power supply. The power supply will generate a lot of heat during operation. If the cooling system cannot effectively dissipate heat, the temperature of the power supply will be too high. In addition, long-term high-load operation will increase the temperature of the power supply, and in severe cases may even burn the power supply.
3. Power supply protection function failure: If the power supply protection function (such as over-current protection, over-voltage protection, under-voltage protection, etc.) fails, the power supply may be damaged.
4. Low power efficiency: If there is a problem with the power efficiency of TPS54331DR, it may be due to excessive losses on the primary and secondary sides. In addition, this problem may also occur if the turns ratio of the transformer is inappropriate.
5. The power supply is unstable or exceeds expectations: TPS54331DR is a high-efficiency switch-mode power supply (SMPS) controller with primary-side feedback (PSR) function. When the input voltage or output voltage appears unstable, this may be a sign of a power supply failure.
Frequently Asked Questions
1. What is the package type of the TPS54331DR?
The TPS54331DR is available in a 8-Pin SOIC (Small Outline Integrated Circuit) package.
2. What type of regulator is the TPS54331DR?
The TPS54331DR is a synchronous step-down (buck) voltage regulator.
3. What is the operating temperature range of TPS54331DR?
The operating temperature of TPS54331DR ranges from -40°C to 150 °C.
4. What is the TPS54331DR used for?
The TPS54331DR is used as a voltage regulator in electronic circuits to step down a higher input voltage to a regulated lower output voltage.
