TDA8933BTW/N2,118 NXP Semiconductors, TDA8933BTW/N2,118 Datasheet - Page 9

• 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
Advantage of the sweep rather then a fixed ignition frequency is that sensitivity for spread
in resonance frequency is much lower.
Once the lamps are ignited the frequency sweep down continues, gradually increasing the
lamp current (the resonance circuit should now still be inductive, so current increases as
frequency drops) untill the current regulation level is reached and the current regulation
loop starts decreasing the phase shift between the bridge halves in order to keep the lamp
current constant. If the current regulation loop cannot decrease the phase shift fast
enough to counteract the frequency sweep down, then the frequency sweep is slowed
down. Once the frequency has reached Fs(min), synchronisation and PWM dimming are
enabled (See
Initial ignition frequency sweep and PWM-generator are not synchronised, and once the
frequency sweep is finished PWM dimming can start anywhere in its cycle.
During PWM dimming the switching frequency is constant. Only the phase shift is swept
from its regulated value to its minimum value and back. The phase shift sweep has to
provide re-ignition of the lamps, therefor the unloaded resonance curve of
be high enough at the normal operation switching frequency (which is either Fs(min) or
the synchronised switching freqency f
The voltage at the CVFB-pin is inverse proportional to the switching frequency,(see
Figure
switching frequency is Fs(min).
The voltage at the CSWP-pin is proportional to the phase shift (see
at the CSWP-pin is clamped at the low side at V
Because V
Fig 7. Timing diagram of the initial ignition frequency sweep
8). The voltage at the CVFB-pin is clamped at the voltage V
CIFB
Figure
is clamped at V
7).
Rev. 02.0 — February 2007
High Voltage Full-bridge control IC for CCFL backlighting
CIFB(hclamp)
sync
.
, V
CSWP
CSWP(lclamp)
is also clamped.
and at the high side at V
UBA2074(A)
CVFB(range)
Figure
© NXP B.V. 2007. All rights reserved.
Figure 6
8). The voltage
were the
has to
9 of 33
CIFB
.