データシートサーチシステム |
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ML4813IS データシート(PDF) 1 Page - Micro Linear Corporation |
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ML4813IS データシート(HTML) 1 Page - Micro Linear Corporation |
1 / 15 page April 1997 ML4813* Flyback Power Factor Controller 1 GENERAL DESCRIPTION The ML4813 is a PWM controller designed for use in a discontinuous "flyback" or "buck-boost" type power factor correction (PFC) system for low power, low cost applications. The circuit includes a precision reference, oscillator, error amplifier, over-voltage comparator, over-current comparator, and an extra op-amp as well as a high current output. In addition, start-up is simplified by an under-voltage lockout circuit. In a typical application, the ML4813 functions as a voltage mode regulator. By maintaining a constant duty cycle, the current follows the input voltage, making the impedance of the entire circuit appear purely resistive. With the flyback circuit, power factors of 0.99 are easily achievable with a small output inductor and a minimum of external components. FEATURES s Precision buffered 5V reference s Extra op-amp for output voltage instrumentation amplifier s Overcurrent comparator for switch protection s Soft start and under-voltage lockout for easy low surge off-line starting s 1A peak current Totem-pole output drive s Overvoltage comparator eliminates output "runaway" due to load removal s Large oscillator amplitude for better noise immunity * This Part Is End Of Life As Of August 1, 2000 BLOCK DIAGRAM - + + - S R Q Q 12 OUT 4 VFB ERROR AMPLIFIER 5V 2 SOFT START + - 1 ILIMIT CURRENT LIMIT COMPARATOR 1V 5 OVP OVP COMPARATOR 5.6V - + 3 COMP PWM COMPARATOR 16 CT 9 RT 10 SYNC OSCILLATOR 15 GND UNDERVOLTAGE LOCKOUT 13 VCC 14 VREF 32V + - 11 PWR GND 6 OA OUT 7V 7 OA- 8 OA+ 60µA |
同様の部品番号 - ML4813IS |
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同様の説明 - ML4813IS |
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