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UC3853 Datasheet Preview

UC3853 Datasheet

High Power Factor Preregulator

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High Power Factor Preregulator
UC1853
UC2853
UC3853
FEATURES
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
DESCRIPTION
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.
BLOCK DIAGRAM
11/97
UDG-94120-1




Unitrode

UC3853 Datasheet Preview

UC3853 Datasheet

High Power Factor Preregulator

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ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Output Drive Current,
Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.125A
Peak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A
Output Minimum Voltage . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V
IAC Maximum Input Current . . . . . . . . . . . . . . . . . . . . . . . . 1mA
IMO Maximum Output Current . . . . . . . . . . . . . . . . . . . . . –2mA
IMO Minimum Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V
FB Maximum Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
VCOMP Maximum Voltage. . . . . . . . . . . . . . . . . . . . . . . . . 6.2V
ICOMP Sourcing Current . . . . . . . . . . . . . . . . . . . . Self-Limiting
ICOMP Sinking Current . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
ICOMP Maximum Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 7.2V
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
All voltages with respect to GND. Currents are positive into,
negative out of the specified terminal. Consult Packaging Section
of Databook for thermal limitations and considerations of
packages.
CONNECTION DIAGRAM
DIL-8, SOIC-8 (Top View)
J or N, D Package
UC1853
UC2853
UC3853
ELECTRICAL CHARACTERISTICS
PARAMETER
Undervoltage Lockout Section
VCC Turn-on Threshold
Hysteresis
Supply Current Section
IVCC Startup
IVCC
Voltage Loop Error Amplifier Section
Transconductance
Input Voltage
AVOL
Output Sink Current
Output Source Current
Output Voltage High
Output Voltage Low
Current Loop Error Amplifier Section
Offset Voltage
Voltage Gain
Sink Current
Source Current
Output High
Output Low
PWM Modulator Gain
Unless otherwise stated, these parameters apply for TA = –55°C to +125°C for the
UC1853; –25°C to +85°C for the 2853; and 0°C to +70°C for the UC3853; VCC =
16V, VFB = 3V, IAC = 100mA, VVCOMP = 3.75V, VICOMP = 3V, TA = TJ.
TEST CONDITIONS
MIN TYP MAX UNITS
VVCOMP, VICOMP Open
11.5 13
1.5 1.8 2.1
V
V
VCC = 8V, IAC = 100µA; VVCOMP, VICOMP Open
IAC = 0µA, VICOMP = 0V
250 500 mA
10 15 mA
IOUT = ± 20µA 0-70C
Temperature
0-70C
Temperature
VVCOMP = 1V – 4V
VFB = 3.2V, VVCOMP = 3.75V
VFB = 2.8V, VVCOMP = 3.75V
300 450 575 µmho
135 640 µmho
2.925 3 3.075 V
2.9 3.1 V
50 60
dB
20 50
µA
–50 –20 µA
5.5 6
V
0.6 0.9
V
VICOMP = 1V – 4V
VIMO = 100mV, VICOMP = 3V
VIMO = –0.1V, VICOMP = 3V
IICOMP = –50mA
IICOMP = 50mA
VICOMP = 2V – 3V (Note 1)
0 6 mV
70 dB
1 mA
–150 –80 mA
6 6.8
V
0.3 0.8
V
20 %/V
2


Part Number UC3853
Description High Power Factor Preregulator
Maker Unitrode
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UC3853 Datasheet PDF






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