Moteur de recherche de fiches techniques de composants électroniques |
|
TDA8944J Fiches technique(PDF) 6 Page - NXP Semiconductors |
|
TDA8944J Fiches technique(HTML) 6 Page - NXP Semiconductors |
6 / 21 page Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier Product specification Rev. 02 — 14 February 2000 6 of 21 9397 750 06861 © Philips Electronics N.V. 2000. All rights reserved. Mute — In this mode the amplifier is DC-biased but not operational (no audio output); the DC level of the input and output pins remain on half the supply voltage. This allows the input coupling and Supply Voltage Ripple Rejection (SVRR) capacitors to be charged to avoid pop-noise. The device is in mute mode when 3V<VMODE <(VCC − 1.5 V). Operating — In this mode the amplifier is operating normally. The operating mode is activated at VMODE < 0.5 V. 8.3.1 Switch-on and switch-off To avoid audible plops during supply voltage switch-on or switch-off, the device is set to standby mode before the supply voltage is applied (switch-on) or removed (switch-off). The switch-on and switch-off time can be influenced by an RC-circuit on the MODE pin. Rapid on/off switching of the device or the MODE pin may cause ‘click- and pop-noise’. This can be prevented by proper timing of the RC-circuit on the MODE pin. 8.4 Supply Voltage Ripple Rejection (SVRR) The SVRR is measured with an electrolytic capacitor of 10 µF on pin SVR at a bandwidth of 10 Hz to 80 kHz. Figure 13 on page 11 illustrates the SVRR as function of the frequency. A larger capacitor value on the SVR pin improves the ripple rejection behaviour at the lower frequencies. 8.5 Built-in protection circuits The TDA8944J contains two types of protection circuits, i.e. short-circuit and thermal shutdown. 8.5.1 Short-circuit protection Short-circuit to ground or supply line — This is detected by a so-called ‘missing current’ detection circuit which measures the current in the positive supply line and the current in the ground line. A difference between both currents larger than 0.4 A, switches the power stage to standby mode (high impedance). Short-circuit across the load — This is detected by an absolute-current measurement. An absolute-current larger than 2 A, switches the power stage to standby mode (high impedance). 8.5.2 Thermal shutdown protection The junction temperature is measured by a temperature sensor; at a junction temperature of approximately 150 °C this detection circuit switches the power stage to standby mode (high impedance). |
Numéro de pièce similaire - TDA8944J |
|
Description similaire - TDA8944J |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |