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| UM10710 Datasheet, PDF (8/25 Pages) NXP Semiconductors – UBA20270DB1122 - 35 W/46 V/690 mA LED driver demo board | |||
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NXP Semiconductors
UM10710
UBA20270DB1122 - 35 W/46 V/690 mA LED driver demo board
⢠Mode 4 [t3, t4] The voltage (Vb ï Vin2) is applied to Lb and iLb linearly increases, this
mode ends when iLb reaches zero
LLQ UHF
'
LLQ UHF
'
9LQ UHF
9LQ
6
/E
9/E L/E
'
9%
9LQ
'
a. Mode 1: t0, t1
6
'
DDD
LOQ UHF
'
9LQ UHF
9LQ
6
'
/E
9/E L/E
9%
9LQ
'
b. Mode 2: t1, t2
6
'
DDD
LLQ UHF
'
9OQ UHF
9OQ
6
9/E L/E
'
9%
9OQ
'
6
'
DDD
c. Mode 3: t2, t3
Fig 7. Topological stages of the PFC
9LQ UHF
9LQ
6
'
9/E L/E
9%
9LQ
'
d. Mode 4: t3, t4
G >WW@
6
'
DDD
UM10710
User manual
All information provided in this document is subject to legal disclaimers.
Rev. 2 â 25 September 2013
© NXP B.V. 2013. All rights reserved.
8 of 25
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