Datasheet

T
J
- Temperature - °C
0
0.4
0.8
1.2
1.6
2.0
V
GATE
– Gate Low Voltage - V
GATE LOW VOLTAGE
WITH DEVICE OFF
vs
TEMPERATURE
0.2
0.6
1.0
1.4
1.8
-60 -35 -10 65 115 14015 40 90
V
GATE
VCC = 5V
I
CC
= 20mA
APPLICATION INFORMATION
UCC28019A Operation
UCC28019A
www.ti.com .................................................................................................................................................. SLUS828B – DECEMBER 2008 – REVISED APRIL 2009
TYPICAL CHARACTERISTICS (continued)
Unless otherwise noted, VCC = 15V
DC
, 0.1 µ F from VCC to GND, -40 ° C ≤ T
J
= T
A
≤ 125 ° C. All voltages are with respect to
GND. Currents are positive into and negative out of the specified terminal.
Figure 17.
The UCC28019A is a switch-mode controller used in boost converters for power factor correction operating at a
fixed frequency in continuous conduction mode. The UCC28019A requires few external components to operate
as an active PFC pre-regulator. Its trimmed oscillator provides a nominal fixed switching frequency of 65 kHz,
ensuring that both the fundamental and second harmonic components of the conducted-EMI noise spectrum are
below the EN55022 conducted-band 150 kHz measurement limit.
Its tightly-trimmed internal 5-V reference voltage provides for accurate output voltage regulation over the typical
world-wide 85-265VAC mains input range from zero to full output load.
Regulation is accomplished in two loops. The inner current loop shapes the average input current to match the
sinusoidal input voltage under continuous inductor current conditions. Under light load conditions, depending on
the boost inductor value, the inductor current may go discontinuous but still meet Class-D requirements of
EN61000-3-2 despite the higher harmonics. The outer voltage loop regulates the PFC output voltage by
generating a voltage on VCOMP (dependent upon the line and load conditions) which determines the internal
gain parameters for maintaining a low-distortion steady-state input current wave-shape.
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