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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ML4826 Scheda tecnica(PDF) 1 Page - Micro Linear Corporation |
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ML4826 Scheda tecnica(HTML) 1 Page - Micro Linear Corporation |
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1 / 16 page  June 1997 ML4826 * PFC and Dual Output PWM Controller Combo 1 GENERAL DESCRIPTION The ML4826 is a high power controller for power factor corrected, switched mode power supplies. PFC allows the use of smaller, lower cost bulk capacitors, reduces power line loading and stress on the switching FETs, and results in a power supply that fully complies with IEC1000-3-2 specifications. The ML4826 includes circuits for the implementation of a leading edge, average current “boost” type power factor correction and a trailing edge, pulse width modulator (PWM) with dual totem-pole outputs. The device is available in two versions; the ML4826-1 (fPWM = fPFC) and the ML4826-2 (fPWM = 2 x fPFC). Doubling the switching frequency of the PWM allows the user to design with smaller output components while maintaining the optimum operating frequency for the PFC. An over-voltage comparator shuts down the PFC section in the event of a sudden decrease in load. The PFC section also includes peak current limiting and input voltage brown-out protection. The PWM section can be operated in current or voltage mode at up to 250kHz and includes a duty cycle limit to prevent transformer saturation. FEATURES s Internally synchronized PFC and PWM in one IC s Low total harmonic distortion s Reduced ripple current in the storage capacitor between the PFC and PWM sections s Average current, continuous boost, leading edge PFC s High efficiency trailing edge PWM with dual totem-pole outputs s Average line voltage compensation with brown-out control s PFC overvoltage comparator eliminates output “runaway” due to load removal s Current-fed multiplier for improved noise immunity s Overvoltage protection, UVLO, and soft start BLOCK DIAGRAM * This Part Is End Of Life As Of August 1, 2000 VCC2 19 VEAO IEAO VFB IAC VRMS ISENSE RTCT OSCILLATOR OVP PFC ILIMIT UVLO VREF PULSE WIDTH MODULATOR POWER FACTOR CORRECTOR 2.5V + - - + 20 2 4 3 7.5V REFERENCE 18 VCC 17 VCCZ VEA 7 - + IEA 1 + - + - PFC OUT 15 S R Q Q S R Q Q 2.7V -1V RAMP 2 9 PWM 1 13 S R Q Q VDC 6 SS 5 DC ILIMIT 10 VCC DUTY CYCLE LIMIT - + 1V - + 2.5V VFB - + 8V 8V VIN OK GAIN MODULATOR VCCZ x 2 (-2 VERSION ONLY) 3.5k Ω 3.5k Ω 1.5V 50µA - + 13.5V DC ILIMIT RAMP 1 8 PWM 2 14 S T Q Q VCC2 PGND 16 PGND 12 AGND 11 8V |
Codice articolo simile - ML4826 |
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Descrizione simile - ML4826 |
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