Micro Linear ML4813
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. By maintaining a constant duty cycle, the current follows the input voltage, making the impedance of the entire circuit appear purely resistive.
| Part No. |
ML4813 |
| Datasheet |
ML4813
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| Manufacturer |
 Micro Linear |
| Description |
Flyback Power Factor Controller |
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GENERAL DESCRIPTION
In addition, start-up is simplified by an under-voltage lockout circuit. In a typical application, the ML4813 functions as a voltage mode regulator. 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 s Precision buffered 5V reference Extra op-amp for output voltage instrumentation amplifier Overcurrent comparator for switch protection Soft start and under-voltage lockout for easy low surge off-line starting 1A peak current Totem-pole output drive Overvoltage comparator eliminates output "runaway" due to load removal Large oscillator amplitude for better noise immunity s s s s s * This Part Is End Of Life As Of August 1, 2000 BLOCK DIAGRAM VFB 4 - ERROR AMPLIFIER OA OUT 7V OA+ + 8 7 6 5V + 60µA SOFT START 2 - OAVREF 14 ILIMIT 1 + CURRENT LIMIT COMPARATOR UNDERVOLTAGE LOCKOUT VCC 13 1V OVP 5 - 32V OVP COMPARATOR S Q Q + OUT 12 5.6V COMP 3 - R + PWR GND 11 CT 16 PWM COMPARA...
