The UCC28019 8-pin active Power Factor Correction (PFC) controller uses the boost topology operating in Continuous Conduction Mode (CCM)

UCC28019

Manufacturer Part NumberUCC28019
DescriptionThe UCC28019 8-pin active Power Factor Correction (PFC) controller uses the boost topology operating in Continuous Conduction Mode (CCM)
ManufacturerTexas Instruments
UCC28019 datasheet
 


Specifications of UCC28019

Uvlo Thresholds On/off(v)10.5/9.5Operating Supply(max)(v)22
Startup Current(ma)0.1Operating Supply Current(ma)7
Vref(v)5Vref Tol(%)2
Duty Cycle(max)(%)99.3Practical Operating Frequency(max)(mhz)0.65
Pin/package8PDIP, 8SOIC  
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VCC Under-Voltage Lockout (UVLO)
During startup, UVLO keeps the device in the off state until VCC rises above the 10.5-V enable threshold,
VCC
. With a typical 1 V of hysteresis on UVLO to eliminate noise, the device turns off when VCC drops to the
ON
9.5-V disable threshold, VCC
.
OFF
Auxilary Supply
C
DECOUPLE
Input Brown-Out Protection (IBOP)
The VINS, (sensed input line voltage), input provides a means for the designer to set the desired mains RMS
voltage level at which the PFC pre-regulator should start-up, V
at which it should shut down, V
AC(turnoff)
“brown-out” voltage, where excessive line current could overheat components. In addition, because VCC bias is
not derived directly from the line voltage, IBOP protects the circuit from low line conditions that may not trigger
the VCC UVLO turn-off.
R
VINS1
Rectified AC Line
R
C
VINS2
IN
Figure 23. Input Brown-Out Protection (IBOP)
Input line voltage is sensed directly from the rectified ac mains voltage through a resistor divider filter network
providing a scaled and filtered value at the VINS input. IBOP puts the device in standby mode when VINS falls
(high-to-low) below 0.8 V, VINS
BROWNOUT_th
above 1.5 V, VINS
. I
ENABLE_th
VINS_0 V
this low, there is little concern for any set-point error caused by this current flowing through the sensing network.
The highest reasonable value resistance for this network should be chosen to minimize power dissipation,
especially in applications requiring low standby power. Be aware that higher resistance values are more
susceptible to noise pickup, but low noise PCB layout techniques can help mitigate this. Also, depending on the
resistor type used and its voltage rating, R
voltage stresses.
Copyright © 2007, Texas Instruments Incorporated
VCC
VCC
10.5V
ON
GND
VCC
9.5V
OFF
Figure 22. UVLO
, as well as the desired mains RMS level
AC(turnon)
. This prevents unwanted sustained system operation at or below a
Input Brown-Out Protection (IBOP)
20k
VINS
C
VINS
5V
VIN
. The device comes out of standby when VINS rises (low-to-high)
, bias current sourced from VINS, is less than 0.1 A. With a bias current
should be implemented with multiple resistors in series to reduce
VINS1
Product Folder Link(s):
UCC28019
UCC28019
SLUS755B – APRIL 2007 – REVISED DECEMBER 2007
+
S
Q
UVLO
R
Q
+
+
S
Q
VIN
ENABLE_th
1.5 V
IBOP
R
Q
+
BROWNOUT_th
0.82 V
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