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UC2853A Fiches technique(PDF) 1 Page - Texas Instruments

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No de pièce UC2853A
Description  High Power Factor Preregulator
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2853A Fiches technique(HTML) 1 Page - Texas Instruments

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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


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