UBA2071T/N1,118 NXP Semiconductors, UBA2071T/N1,118 Datasheet - Page 8

• 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
2.
UBA2071_A_1
Product data sheet
When both GH and GL are low during the lamps off period of PWM dimming (so PWMD is high), the IC will wait with entering the
standby state until PWMD becomes low again and GL can be made high.
8.2 V
8.3 Enable
8.4 The oscillator
When the UBA2071 is disabled (EN pin low) or in the stop state, the V
activated. The V
prevents the start-up current source from charging the V
voltage.
The maximum current that is allowed to be delivered by the start-up current source is
determined by the clamp voltage as stated in
voltage as stated in
The UBA2071A has no V
The UBA2071 or UBA2071A can be activated or set to standby via the EN pin. If the
voltage on the EN pin is below V
state
it is pulled low by an internal bias current of I
When the voltage on the EN pin comes above V
DC blocking capacitor charging mode (see
goes over V
Section
The UBA2071 and UBA2071A have an internal voltage controlled sawtooth oscillator, see
Figure
The IC switches GL on and GH off during one oscillator period and GL off and GH on
during the next oscillator period. This results in a half bridge voltage with a frequency
(called the switching frequency f
duty cycle of exactly 50 %.
The oscillator frequency is controlled by changing the charge current at the CF pin. By
changing the frequency the lamp current is controlled. It is also used to limit the
transformer output voltage and for gradually switching the lamps on and off during PWM
dimming.
DD
2
clamp
, and most parts of the internal circuits will shut down. When the EN pin is left open,
5. Its frequency inverses in proportion to the capacitor connected to the CF pin.
8.8) and subsequently go to normal operation mode again.
th(H)2(EN)
DD
clamp is an internal active zener limiting the voltage to V
Table
, the IC will start with the initial ignition frequency sweep (see
Rev. 01 — 23 June 2008
DD
4.
clamp.
sw
th(L)(EN)
from here on) of half the oscillator frequency and with a
, the IC will stop oscillating at the next GL high
Half bridge control IC for CCFL backlighting
Section
UBA2071; UBA2071A
bias(EN)
Table 6
th(H)1(EN)
.
8.8). When the voltage on the EN pin
and the maximum allowed V
DD
, the IC will start up in
buffer capacitor to too high a
DD
© NXP B.V. 2008. All rights reserved.
clamp is
clamp(VDD)
DD
8 of 35
. It