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UC2853A Fiches technique(PDF) 1 Page - Texas Instruments |
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UC2853A Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 10 page UC2853A The UC2853A provides simple, yet high performance active power factor correction. Using the same control technique as the UC1854, this 8-pin de- vice exploits a simplified architecture and an internal oscillator to minimize external component count. The UC2853A incorporates a precision multi- plier/squarer/divider circuit, voltage and current loop error amplifiers, and a precision voltage reference to implement average current mode control with RMS line voltage compensation. This control technique maintains con- stant loop gain with changes in input voltage, which minimizes input line current distortion over the worldwide input voltage range. The internal 63kHz oscillator includes an external clock input, allowing syn- chronization to downstream converters. Additionally, the device features an overvoltage protection comparator, a clamped MOSFET gate driver which self-biases low during undervoltage lockout, and low startup and supply current. The UC2853A is identical to the UC2853 except the internal oscillator fre- quency has been reduced from 75kHz to 63kHz. The switching frequency is lowered in order to keep the second harmonic of the switching frequency below a 150kHz. For EMI specifications at 150kHz this makes it easier for a design to meet system requirements. These devices are available in 8-pin PDIP (P) and SOIC (D) packages. The UC2853A is specified for operation from –40°C to 105°C. High Power Factor Preregulator • Complete 8-pin Power Factor Solution • Reduced External Components • RMS Line Voltage Compensation • Precision Multiplier/Squarer/Divider • Internal 63kHz Synchronizable Oscillator • Average Current Mode PWM Control • Overvoltage Protection Comparator • High Current, Clamped Gate Driver BLOCK DIAGRAM SLUS650A - FEBRUARY 2005 - REVISED JANUARY 2006 FEATURES DESCRIPTION UDG-94120-1 application INFO available |
Numéro de pièce similaire - UC2853A |
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Description similaire - UC2853A |
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