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TOP204YAI Datasheet(PDF) 6 Page - Power Integrations, Inc. |
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TOP204YAI Datasheet(HTML) 6 Page - Power Integrations, Inc. |
6 / 16 page TOP200-4/14 D 7/96 6 General Circuit Operation Primary Feedback Regulation The circuit shown in Figure 7 is a simple 5 V, 5 W bias supply using the TOP200. This universal input flyback power supply employs primary-side regulation from a transformer bias winding. This approach is best for low-cost applications requiring isolation and operation within a narrow range of load variation. Line and load regulation of ±5% or better can be achieved from 10% to 100% of rated load. Voltage feedback is obtained from the transformer (T1) bias winding, which eliminates the need for optocoupler and secondary-referenced error amplifier. High-voltage DC is applied to the primary winding of T1. The other side of the transformer primary is driven by Figure 7. Schematic Diagram of a Minimum Parts Count 5 V, 5 W Bias Supply Utilizing the TOP200. the integrated high-voltage MOSFET transistor within the TOP200 (U1). The circuit operates at a switching frequency of 100 kHz, set by the internal oscillator of the TOP200. The clamp circuit implemented by VR1 and D1 limits the leading-edge voltage spike caused by transformer leakage inductance to a safe value. The 5 V power secondary winding is rectified and filtered by D2, C2, C3, and L1 to create the 5 V output voltage. The output of the T1 bias winding is rectified and filtered by D3, R1, and C5. The voltage across C5 is regulated by U1, and is determined by the 5.7 V internal shunt regulator at the CONTROL pin of U1. When the rectified bias voltage on C5 begins to exceed the shunt regulator voltage, current will flow into the control pin. Increasing control pin current decreases the duty cycle until a stable operating point is reached. The output voltage is proportional to the bias voltage by the turns ratio of the output to bias windings. C5 is used to bypass the CONTROL pin. C5 also provides loop compensation for the power supply by shunting AC currents around the CONTROL pin dynamic impedance, and also determines the auto-restart frequency during start- up and auto-restart conditions. See DN- 8 for more information regarding the use of the TOP200 in bias supplies. PI-1749-012296 5 V RTN C5 47 µF U1 TOP200YAI D2 1N5822 D3 1N4148 L1 (Bead) C2 330 µF 25 V C3 150 µF 25 V T1 D1 UF4005 DC INPUT VR1 1N4764 R1 22 Ω CIRCUIT PERFORMANCE: Load Regulation - ±4% (10% to 100%) Line Regulation - ±1.5% 95 to 370 V DC Ripple Voltage ±25 mV DRAIN SOURCE CONTROL |
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