UBA2071T/N1,118 NXP Semiconductors, UBA2071T/N1,118 Datasheet - Page 22

• 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
UBA2071_A_1
Product data sheet
8.14.8 Ignition Failure (IF)
8.14.9 The NONFAULT pin
duration longer than t
the control circuits that arcing has been detected. When arcing is detected, PWM dimming
is disabled and the fault timer is started.
When the current control loop comes close to its regulation point, the lamps are assumed
to be on (ignited). This is when the average absolute voltage on the IFB pin is above
V
frequency has reached f
disabled and the fault timer is started.
The NONFAULT pin provides bidirectional signalling of the fault status between the IC and
any external circuit. When no fault is detected, the voltage on the pin is pulled high to
V
An external circuit can signal to the IC that a fault has been detected by pulling a current
larger than I
from the pin and start the fault timer. To prevent interference with the PWM dimming, the
IC will only look at the NONFAULT pin during the period when the lamp current regulation
loop is closed (when
When the IC detects an internal fault, see
via the NONFAULT pin by pulling the pin down (after the fault output delay time t
At this point the IC can no longer detect the external fault. However, by then the fault timer
is already running.
Fig 17. Input and output levels at the NONFAULT pin
th(lod)(IFB)
oc(NONFAULT)
. If the lamps are not on when the ignition sweep is finished, (switching
I
sc(NONFAULT)
trig(I)NONFAULT
by an internal current source.
load line
out: high (inactive)
in: low (active)
spike(min)
V
CSWP
Rev. 01 — 23 June 2008
sw(min)
from the NONFAULT pin. The IC will detect the current drawn
I
trig(I)NONFAULT
. Each spike will trigger an internal one-shot, which signals to
=
), then an ignition failure is detected, PWM dimming is
out: high (inactive)
NONFAULT
in: high (inactive)
V
pin voltage
CVFB
1 V
).
0
Section 8.14.2
Half bridge control IC for CCFL backlighting
V
V
UBA2071; UBA2071A
oc(NONFAULT)
trig(I)NONFAULT
out: low (active)
in: unknown
to
Section
I
sink(NONFAULT)
8.14.8), it signals this
© NXP B.V. 2008. All rights reserved.
NONFAULT
pin current
014aaa113
d(o)fault)
22 of 35
).