Low Cost 1000 Watt 300 Volt Rf Power Amplifier For 27.12mhz

The LinkSwitch-TN supply LNK306PN provides a constant current output of up to 9 W at a maximum output voltage of 70 VDC, making it suitable for driving LEDs. A passive valley-fill power factor correction (PFC) circuit ensures the supply achieves a power factor greater than 0.92, complying with ENERGY STAR SSL requirements for commercial applications. The design also adheres to EN55015B EMI standards. A line fuse (F1) safeguards the power supply against catastrophic failures. Capacitors (C6 and C10) are utilized for differential filtering. EMI is reduced through the use of inductors (L1 and L2) along with resistors (R15 and R16). Full-wave rectification is achieved using diodes (D5-D8). Diodes (D2, D3, and D4), in conjunction with capacitors (C1 and C2), form the valley-fill circuit and provide power factor correction. The LNK306PN device employs an ON/OFF control method; when the current exceeding 49 A is delivered into the feedback (FB) pin of U1, the MOSFET switching is disabled. During the next internal clock cycle, the FB pin current is sampled, and if it is below a certain threshold, the switching operation resumes.

The LNK306PN is a highly integrated power supply solution designed for efficient LED driving applications. It features a constant current output, making it ideal for driving LED arrays where consistent brightness is crucial. The maximum output voltage of 70 VDC allows for versatility in various LED configurations. The passive valley-fill PFC circuit incorporated into the design not only improves the overall efficiency of the power supply but also minimizes harmonic distortion, thus enhancing compatibility with sensitive electronic devices.

The implementation of EN55015B EMI standards within the design ensures that the power supply operates without generating excessive electromagnetic interference, which could disrupt other electronic equipment. The use of a line fuse (F1) provides an essential safety feature, protecting the circuit from overcurrent conditions that could lead to damage or failure.

Differential filtering capacitors (C6 and C10) play a critical role in smoothing the output voltage and reducing noise, thereby enhancing the stability of the LED drive current. The inclusion of inductors (L1 and L2) and resistors (R15 and R16) further mitigates EMI, ensuring that the power supply meets stringent regulatory requirements.

Full-wave rectification, achieved through diodes (D5-D8), converts the AC input into a stable DC output, which is crucial for LED operation. The valley-fill circuit, comprising diodes (D2, D3, and D4) and capacitors (C1 and C2), enhances the power factor by allowing the circuit to draw current more efficiently, thus reducing energy losses.

The ON/OFF control mechanism utilized by the LNK306PN optimizes performance by regulating the output current. When the feedback pin (FB) detects a current exceeding 49 A, it disables the MOSFET, preventing potential damage to the circuit. This feedback mechanism ensures that the power supply operates within safe limits, providing reliable performance over time.

Overall, the LNK306PN power supply is an advanced solution for LED driving applications, combining efficiency, safety, and compliance with industry standards to deliver exceptional performance.The LinkSwitch-TN supply LNK306PN shown in Figure 1 provides a constant current output of up to 9 W at a maximum output voltage of 70 VDC, ideal for driving LEDs A passive valley- ll power factor correction (PFC) circuit gives the supply a power factor greater than 0. 92, which meets requirements of ENERGY STAR SSL for commercial applications. C are has been taken such that the supply also meets EN55015B EMI requirements. Line fuse F1 protects the power supply in case of catastrophic failures. Capacitors C6 and C10 provide differential ltering. EMI is mitigated by inductors L1 and L2 along with resistors R15 and R16. Full wave recti cation is accomplished by Diodes D5-D8. Diodes D2, D3 and D4, along with capacitors C1 and C2, form the valley ll circuit and provide power factor correction. The LNK306PN device uses an ON/OFF control method. Whenever current in excess of 49 A is delivered into the FB pin of U1, MOSFET switching is disabled. Upon the device`s next internal Clock cycle, the FB pin current is sampled, and if it is below the 🔗 External reference