UBA2071T/N1,118 NXP Semiconductors, UBA2071T/N1,118 Datasheet - Page 11

• Manufacturer Part Number: UBA2071T/N1,118
• Description: IC DRIVER HALF BRIDGE 24SOIC
• Manufacturer: NXP Semiconductors
• Type: CCFL/EEFL Controllerr

Specifications of UBA2071T/N1,118

• Package / Case: 24-SOIC (0.300", 7.50mm Width)
• Frequency: 38 ~ 42kHz
• Current - Supply: 1.5mA
• Voltage - Supply: 14V
• Operating Temperature: -25°C ~ 100°C
• Driver Type: CCFL Drivers
• Operating Supply Voltage: 14 V
• Maximum Operating Temperature: + 100 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 25 C
• Supply Current: 1.5 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 935285139118

NXP Semiconductors
4.
UBA2071_A_1
Product data sheet
For CCFLs only.
8.8 Lamp (re-)ignition
Remark: Due to the nature of the charging sequence, V
charged to 0.5
charging mode longer than necessary, V
constant made by R1 and C1 in example A in
V
V
the IC may get stuck in DC blocking capacitor charging mode.
The IC starts at its maximum switching frequency f
voltage control loops are enabled. The frequency is swept down towards the minimum
frequency f
voltage will increase as the frequency comes closer to the resonant frequency of the
unloaded resonance circuit. Once the ignition voltage V
and the lamp voltage will drop
Figure
Fig 7.
Cblock
Cblock
EN
(H)2(EN)
(H)1(EN)
GH
GL
8.
(L)(EN)
cannot become more than 0.5
than 0.5
DC blocking capacitor charging mode
V
SH
sw(min)
0
0
disabled
0.5 T
V
, see
V
HV
HV
(when given enough time). If the IC is kept in DC blocking capacitor
(with enough margin) in examples B and C of
Figure
Rev. 01 — 23 June 2008
DC blocking capacitor charging
9. During this initial ignition frequency sweep the lamp
4
3 / f
to the voltage of the loaded resonance curve, see
7.5 T
sw(min)
V
Cblock
HV
Half bridge control IC for CCFL backlighting
1 / f
, it is important to take a lower target value for
UBA2071; UBA2071A
sw(max)
Figure
will remain 0.5
T
sw(max)
6, is not critical. However, since
ign
Cblock
. The lamp current and the lamp
3 / f
is reached the lamps will ignite
7.5 T
sw(min)
will automatically be
V
HV
. Therefor the time
Figure
© NXP B.V. 2008. All rights reserved.
initial ignition sweep
and normal mode
6, otherwise
014aaa252
11 of 35