TDA8933BTW/N2,118 NXP Semiconductors, TDA8933BTW/N2,118 Datasheet - Page 17

• Manufacturer Part Number: TDA8933BTW/N2,118
• Description: IC AMP AUDIO CLASS D 32HTSSOP
• Manufacturer: NXP Semiconductors
• Type: Class Dr

Specifications of TDA8933BTW/N2,118

• Output Type: 1-Channel (Mono) or 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 20.6W x 1 @ 16 Ohm; 10.3W x 2 @ 8 Ohm
• Voltage - Supply: 10 V ~ 36 V, ±5 V ~ 18 V
• Features: Depop, Differential Inputs, Mute, Short-Circuit and Thermal Protection
• Mounting Type: Surface Mount
• Package / Case: 32-TSSOP Exposed Pad, 32-eTSSOP, 32-HTSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935285222118

NXP Semiconductors
UBA2074(A)
Preliminary data sheet
7.10.5 Ignition Failure (IF)
7.10.6 The nonFAULT-pin
The UBA2074 is capable of driving a full bridge at a higher voltage then its own supply
voltage. A special feature is included to accomodate applications where zero voltage
switching becomes important. The design of the resonant load determines if zero voltage
switching occurs during normal operation. To prevent overheating of the external power
switches of the full bridge due to high switching losses in case of any abnormal condition,
the hard-switching of both half-bridge voltages is monitored internally. At the moment the
high side switch is turned on, the voltage step at the SH-pin is measured. If it is above
VHS(thresshold) then PWM dimming and synchronisation are disabled and the fault timer
is started. Also the frequency is increased by discharging the capacitor at the CVFB pin
(by ICVFB(hs)).
When the current control loop comes close to its regulation point, the lamps are presumed
to be on (ignited). This is when the average double side rectified IFB-pin voltage is above
V
frequency has reached F
synchronisation are 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 by an
internal current source.
An external circuit can signal to the IC that a fault has been detected by pulling down the
pin. The IC will detect the current drawn 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 that the lamp current regulation loop is closed (VCSWP=VCIFB).
When the IC detects a fault internal (as in
via the nonFAULT pin by pulling the pin down. In this case the IC can not see anymore if
there’s an external detected fault, but that’s no problem, because the faulttimer is then
already running.
IFB(lampon)
. If the lamps are not on when the ignition sweep is finished (switching
Rev. 02.0 — February 2007
S(min)
High Voltage Full-bridge control IC for CCFL backlighting
), then an ignition failure is detected, PWM dimming and
Section 7.10.1
to
Section
UBA2074(A)
7.10.5), it signals this
© NXP B.V. 2007. All rights reserved.
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