TNY288PG Detailed explanation of pin function specifications and circuit principle instructions
The "TNY288PG" is a part from Toshiba and is part of their TinySwitch series, specifically a high-efficiency, low- Power , integrated off-line switcher. It is typically used in power supply circuits like SMPS (Switched Mode Power Supplies). Below is the detailed pinout, function, and specification of this device:
Package Type:
The TNY288PG comes in a DIP-8 package, which contains 8 pins in a dual in-line configuration.
Pinout Function and Specification:
Pin Number Pin Name Function Description 1 Drain (D) Drain pin of the internal MOSFET. This pin is used to connect the high-voltage side of the circuit, typically connected to the power supply. 2 Source (S) Source pin of the internal MOSFET. Connects to the ground or common side of the power circuit. 3 Feedback (FB) The feedback input to control the output voltage. This pin is used for regulation and feedback from the output, often connected to an optocoupler. 4 Enable (EN) Enable pin for turning the device on or off. Low signal disables the internal circuit, and high signal enables operation. 5 Ground (GND) Ground pin. Common return path for the power circuit. 6 Vdd (V) Supply voltage pin for the controller circuitry. This pin needs to be connected to an external supply, usually regulated. 7 Drain Sense (DS) Drain sense input for fault conditions, such as over-voltage or under-voltage. 8 Not Connected (NC) A non-connected or internally unused pin.Pin Functionality Overview:
Drain (D): This is the power input pin for the internal MOSFET switch. It connects to the primary side of the transformer or directly to the high-voltage input for switching. Source (S): Connects the source of the MOSFET to ground or the common voltage rail of the system. It allows for proper current flow when the MOSFET turns on. Feedback (FB): This pin is critical for maintaining regulation of the output voltage by receiving feedback from the secondary side (typically through an optocoupler). It regulates the operation of the MOSFET to ensure the correct voltage is maintained. Enable (EN): If the voltage on the Enable pin is lower than the threshold, the device will not operate (it will be in the off state). A high signal (typically a voltage higher than the threshold value) enables the internal circuitry and operation of the switch. Ground (GND): The GND pin provides a reference for the rest of the circuit. All the logic and output signals are referenced to this ground pin. Vdd (V): The Vdd pin powers the controller circuitry inside the TNY288PG. It typically connects to a regulated 5V or 12V supply that powers the internal control circuitry. Drain Sense (DS): This pin monitors the drain voltage for any abnormal conditions. It is used for detecting faults like over-voltage or under-voltage conditions and helps in protecting the device. Not Connected (NC): This is a no-connect pin and is not used in the circuit.Pin Function FAQ (Frequently Asked Questions)
Q: What does Pin 1 (Drain) do in the TNY288PG? A: Pin 1 is the Drain pin of the internal MOSFET switch, which connects to the high-voltage side of the power supply. Q: Is Pin 2 (Source) connected to the ground? A: Yes, Pin 2 (Source) connects to the ground or common side of the power circuit, acting as the return path for the current. Q: What is the function of the Feedback pin (Pin 3)? A: Pin 3 (Feedback) receives feedback from the secondary side of the transformer, helping regulate the output voltage. Q: How does the Enable pin (Pin 4) work? A: Pin 4 (Enable) controls the activation of the device; it must be high for the device to operate and low to disable it. Q: What is the significance of Pin 5 (Ground)? A: Pin 5 (Ground) serves as the common reference for the entire circuit, allowing the rest of the pins to reference the ground potential. Q: What voltage should Pin 6 (Vdd) be supplied with? A: Pin 6 (Vdd) is the supply voltage pin and should be connected to a regulated voltage source, typically around 5V to 12V. Q: What is the function of Pin 7 (Drain Sense)? A: Pin 7 (Drain Sense) monitors the drain voltage for fault detection, ensuring the correct operation of the MOSFET by detecting any abnormal voltage conditions. Q: Does Pin 8 (NC) require any connection? A: No, Pin 8 (NC) is a no-connect pin and should not be used in the circuit. Q: How do I ensure the TNY288PG operates correctly? A: Make sure Pin 6 (Vdd) is supplied with a proper voltage and Pin 4 (Enable) is high. Ensure correct feedback through Pin 3 for voltage regulation. Q: Can the TNY288PG operate without feedback? A: No, the feedback is essential for regulating the output voltage and ensuring stable operation. Q: How does the TNY288PG manage fault conditions? A: Pin 7 (Drain Sense) helps detect faults like over-voltage or under-voltage conditions, which can disable the MOSFET and protect the circuit. Q: Is Pin 1 (Drain) the only input for power to the TNY288PG? A: Yes, Pin 1 (Drain) is the primary high-voltage input, typically connected to the power supply or transformer primary side. Q: Can I use the TNY288PG in a low-power application? A: Yes, the TNY288PG is designed for low-power and high-efficiency applications, making it suitable for small power supplies. Q: What is the recommended operating temperature range for the TNY288PG? A: The typical operating temperature range for the TNY288PG is from -40°C to +125°C. Q: Can the Enable pin (Pin 4) be used for enabling or disabling other parts of the circuit? A: Yes, the Enable pin can be interface d with other logic circuits to control the overall operation of the power supply. Q: Does the TNY288PG require external components for feedback? A: Yes, feedback is typically implemented through an optocoupler connected to Pin 3 (Feedback). Q: What is the role of the Source pin (Pin 2)? A: The Source pin connects to the ground or common side of the circuit and is the return path for current when the internal MOSFET switches on. Q: Can the TNY288PG be used for AC to DC power conversion? A: Yes, it is often used in AC to DC converters, especially in low-power applications such as adapter circuits. Q: How does Pin 7 (Drain Sense) improve reliability? A: Pin 7 helps in detecting faults in the high-voltage side of the circuit, which can prevent over-voltage and under-voltage conditions, improving reliability. Q: What happens if the TNY288PG is not properly connected to the ground? A: If Pin 5 (Ground) is not properly connected, the circuit may fail to operate or function erratically since it does not have a reference for all signals.This covers a detailed overview of the TNY288PG's pin functions and answers common questions regarding its use in circuits.