uba2015t/n1 NXP Semiconductors, uba2015t/n1 Datasheet - Page 7

• Manufacturer Part Number: uba2015t/n1
• Description: 600 V Fluorescent Lamp Driver With Pfc, Linear Dimming And Boost Function
• Manufacturer: NXP Semiconductors

NXP Semiconductors
UBA2016A_15_15A
Objective data sheet
7.2.1 Regulation loop
The control loop senses the PFC output voltage via resistors R1, R2 and the feedback
input FBPFC. The frequency compensation network C1, C2 and R4 sets the response
time and stability of the loop. The voltage at pin FBPFC is regulated to V
voltage on pin FBPFC is above the regulation voltage, pin COMPPFC is charged and
when voltage on pin FBPFC is lower, pin COMPPFC is discharged. Current flow through
pin COMPPFC is controlled by the PFC Operational Transconductance Amplifier (OTA)
and its transconductance g
on-time, t
less energy is transferred. When voltage at pin FBPFC is too low, t
more energy is transferred.
The voltage on pin FBPFC is sampled at the rising edge of pin GPFC and held internally
during the leading edge blanking time t
disturbance of the regulation level due to transition effects when the PFC external power
switch is turned on
The maximum t
V
overshoot. The t
gate is turned on is determined by pin AUXPFC. When this pin is below demagnetization
detection voltage V
the next cycle starts.
During start-up, the capacitor connected to pin COMPPFC is connected by an internal
switch to pin FBPFC which allows it to partially charge before the PFC starts. This reduces
the start-up time.
Fig 6.
clamp(COMPPFC)
mains
on(PFC)
Basic PFC application diagram
on(PFC)
All information provided in this document is subject to legal disclaimers.
. So when the voltage at pin FBPFC is too high, t
to limit the dead time in recovering regulation after a regulation range
on(PFC)
det(demag)AUXPFC
C1
C2
is set when the voltage at pin COMPPFC is clamped to
time can be regulated down to zero. The moment at which the
V
l
i(PFC)
Rev. 1 — 20 May 2011
DSRmains
R4
m(PFC)
COMPPFC
L PFC
. The voltage on pin COMPPFC controls the PFC
AUXPFC
and the low PFC off-time t
leb(FBPPC)
GPFC
D bypass
UBA2016A
UBA2015A
UBA2015
I switch(PFC)
Q PFC
before going to the OTA to prevent
R3
UBA2016A/15/15A
D PFC
GND
FBPFC
600 V fluorescent lamp driver
R1
R2
l
o(PFC)
off(PFC)low
VDD
on(PFC)
on(PFC)
C BUS
© NXP B.V. 2011. All rights reserved.
timer is finished,
is reduced and
V
reg(FBPFC)
is increased and
o(PFC)
001aam533
. When
7 of 42