UM10486 Datasheet, PDF (5/18 Pages) NXP Semiconductors – UBA2015P reference design 120 V (AC)

NXP Semiconductors
UM10486
UBA2015P reference design 120 V (AC)
This type of topology with inductive heating is used in many commercial ballasts whose
power exceeds 25 W, making it a cost-effective application.
The lamps are connected in parallel.
mains
voltage
input
FUSE
SURGE
PROT
EMI
FILTER
AC
RECTIFIER
PFC
BUFFER HALF
CAP
BRIDGE
RESONANT
CIRCUIT
lamps
Fig 3. Block diagram
UBA2015
CONTROLLER
019aac299
4.2 Performance indicators
4.2.1 Input power, power factor and Total Harmonic Distortion (THD)
1.0
Power factor
THD
0.8
019aac485 ₈₀
(1)
Power
(W)
79
0.6
78
0.4
77
0.2
0.0
90
(3)
76
(2)
75
100
110
120
130
140
150
Mains voltage (V)
(1) Power factor
(2) Current THD
(3) Input power (W)
Fig 4. THD, power factor and input power as a function of AC mains input voltage
4.2.2 Lamp end of life detection
IEC asymmetrical power test: The End-Of-Life (EOL) resistor R_EOL is increased (manually
controlled rheostat of 1 k) until the ballast shuts down. A rheostat is a two-terminal
variable resistor. See IEC-61347-2-3 Section 17.3 where this test is described. When the
EOL voltage exceeds the thresholds of the internal window comparator, the slow fault
timer (CPT pin) starts.
UM10486
User manual
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 8 September 2011
© NXP B.V. 2011. All rights reserved.
5 of 18