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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UCC28019
SLUS755B – APRIL 2007 – REVISED DECEMBER 2007
Overcurrent Protection
Inductor current is sensed by R
SENSE
the resistor is tied to the system ground. The voltage is sensed on the rectifier side of the sense resistor and is
always negative. There are two over-current protection features; Peak Current Limit (PCL) protects against
inductor saturation and Soft Over Current (SOC) protects against an overload on the output.
LINE
+
INPUT
R
SENSE
C
R
ISENSE
ISENSE
(Optional)
Figure 25. Soft Over Current (SOC) / Peak Current Limit (PCL)
Soft Over-Current (SOC)
SOC limits the input current. SOC is activated when the current sense voltage on ISENSE reaches -0.73 V,
affecting the internal VCOMP level, and the control loop is adjusted to reduce the PWM duty cycle.
Peak Current Limit (PCL)
Peak current limit operates on a cycle-by-cycle basis. When the current sense voltage on ISENSE reaches -1.08
V, PCL is activated terminating the active switch cycle. The voltage at ISENSE is amplified by a fixed gain of -1.0
and then leading-edge blanked to improve noise immunity against false triggering.
18
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, a low value resistor in the return path of input rectifier. The other side of
Soft Over Current (SOC)
V
0.73V
SOC
V
OUT
ISENSE
+
-1x
Peak Current Limit (PCL)
Product Folder Link(s):
UCC28019
www.ti.com
SOC
+
300ns
V
PCL
Leading Edge
PCL
1.08V
Blanking
+
Copyright © 2007, Texas Instruments Incorporated