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UC2853DTR Fiches technique(PDF) 1 Page - Texas Instruments |
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UC2853DTR Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 10 page UC1853 UC2853 UC3853 The UC3853 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 UC3853 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 75kHz 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. These devices are available in 8-pin plastic and ceramic dual in-line (DIP) packages, and 8-lead small outline (SOIC) packages. The UC1853 is specified for operation from –55°C to +125°C, the UC2853 is specified for operation from –25°C to +85°C, and the UC3853 is specified for operation from 0°C to +70°C. High Power Factor Preregulator • Complete 8-pin Power Factor Solution • Reduced External Components • RMS Line Voltage Compensation • Precision Multiplier/Squarer/Divider • Internal 75kHz Synchronizable Oscillator • Average Current Mode PWM Control • Overvoltage Protection Comparator • High Current, Clamped Gate Driver BLOCK DIAGRAM 11/97 FEATURES DESCRIPTION UDG-94120-1 |
Numéro de pièce similaire - UC2853DTR |
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Description similaire - UC2853DTR |
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