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TFA9842J Datasheet(Fiches technique) 6 Page - NXP Semiconductors

Numéro de pièce TFA9842J
Description  2-channel audio amplifier; SE: 1 W to 7.5 W; BTL: 2 W to 15 W
Télécharger  21 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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Philips Semiconductors
TFA9842J
2-channel audio amplifier (2 x SE or 1 x BTL)
Preliminary data
Rev. 01 — 26 April 2004
6 of 21
9397 750 12013
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Standby — The current consumption is very low and the outputs are floating. The
device is in standby mode when VMODE < 0.8 V, or when pin MODE is grounded.
Mute — The amplifier is DC-biased but not operational (no audio output). This allows
the input coupling capacitors to be charged to avoid pop-noise. The device is in mute
mode when 4.5V<VMODE <(VCC − 3.5 V).
On — The amplifier is operating normally. The operating mode is activated at
VMODE >(VCC − 2.0 V).
8.4 Supply voltage ripple rejection
The supply voltage ripple rejection (SVRR) is measured with an electrolytic capacitor
of 150
µF on pin SVR using a bandwidth of 20 Hz to 22 kHz. Figure 11 illustrates the
SVRR as function of the frequency. A larger capacitor value on pin SVR improves the
ripple rejection behavior at the lower frequencies.
8.5 Built-in protection circuits
The TFA9842J contains two types of temperature sensors; one measures local
temperatures of the power stages and one measures the global chip temperature. At
a local temperature of the power stage of approximately 185 oC or a global
temperature of approximately 150 oC this detection circuit switches off the power
stages for 2 ms. High impedance of the outputs is the result. After this time period the
power stages switch on automatically and the detection will take place again; still a
too high temperature switches off the power stages immediately. This protects the
TFA9842J against shorts to ground, to the supply voltage, across the load and too
high chip temperatures.
The protection will only be activated when necessary, so even during a short-circuit
condition, a certain amount of (pulsed) current will still be flowing through the short,
just as much as the power stage can handle without exceeding the critical
temperature level.
Fig 3.
Mode selection.
MCE502
standby
all mute
1/2 on
0.8
4.5
VCC−3.5
VCC
VMODE (V)
VCC−2.0




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