Motore di ricerca datesheet componenti elettronici |
|
TDA1517ATW Scheda tecnica(PDF) 9 Page - NXP Semiconductors |
|
TDA1517ATW Scheda tecnica(HTML) 9 Page - NXP Semiconductors |
9 / 20 page 2001 Apr 17 9 Philips Semiconductors Product specification 8 W BTL or 2 × 4 W SE power amplifier TDA1517ATW The formula for the cut-off frequency at the input is as follows: thus As can be seen it is not necessary to use high capacitor values for the input; so the delay during switch-on, which is necessary for charging the input capacitors, can be minimized. This results in a good low frequency response and good switch-on behaviour. In stereo applications (single-ended) coupling capacitors on both input and output are necessary. It should be noted that the outputs of both amplifiers are in opposite phase. Built-in protection circuits The IC contains two types of protection circuits: • Short-circuits the outputs to ground, the supply to ground and across the load: short-circuit is detected and controlled by a SOAR protection circuit • Thermal shut-down protection: the junction temperature is measured by a temperature sensor. Thermal foldback is activated at a junction temperature of >150 °C. Output power The output power as a function of supply voltage has been measured on the output pins and at THD = 10%. The maximum output power is limited by the maximum allowable power dissipation and the maximum available output current, 2.5 A repetitive peak current. Supply voltage ripple rejection The SVRR has been measured without an electrolytic capacitor on pin 5 and at a bandwidth of 10 Hz to 80 kHz. The curves for operating and mute condition (respectively) were measured with Rsource =0 Ω. Only in single-ended applications is an electrolytic capacitor (e.g. 100 µF) on pin 5 necessary to improve the SVRR behaviour. Headroom A typical music CD requires at least 12 dB (is factor 15.85) dynamic headroom (compared with the average power output) for passing the loudest portions without distortion. The following calculation can be made for this application at VP = 12 V and RL =8 Ω: Po at THD = 0.1% is approximately 5 W (see Fig.7). Average listening level without any distortion yields: The power dissipation can be derived from Fig.11 for 0 dB and 12 dB headroom. Table 1 Power rating Thus for the average listening level (music power) a power dissipation of 2.0 W can be used for the thermal PCB calculation; see Section “Thermal behaviour (PCB design considerations)”. Mode pin For the 3 functional modes: standby, mute and operate, the MODE pin can be driven by a 3-state logic output stage, e.g. a microcontroller with some extra components for DC-level shifting; see Fig.10 for the respective DC levels. • Standby mode is activated by a low DC level between 0 and 2 V. The power consumption of the IC will be reduced to <0.12 mW. • Mute mode is activated by a DC level between 3.3 and 6.4 V. The outputs of the amplifier will be muted (no audio output); however the amplifier is DC biased and the DC level of the output pins stays at half the supply voltage. The input coupling capacitors are charged when in mute mode to avoid pop-noise. • The IC will be in the operating condition when the voltage at pin MODE is between 8.5 V and VCC. Switch-on/switch-off To avoid audible plops during switch-on and switch-off of the supply voltage, the MODE pin has to be set in standby condition (VCC level) before the voltage is applied (switch-on) or removed (switch-off). The input and SVRR capacitors are smoothly charged during mute mode. The turn-on and turn-off time can be influenced by an RC-circuit connected to the MODE pin. Switching the device or the MODE pin rapidly on and off may cause ‘click and pop’ noise. This can be prevented by proper timing on the MODE pin. Further improvement in the BTL application can be obtained by connecting an electrolytic capacitor (e.g. 100 µF) between the SVRR pin and signal ground. f IC 1 2 π × R i Ci × ------------------------------ = f IC 1 2 π × 30 × 10 3 – × 470 × 10 9 – × ------------------------------------------------------------------------------ 11 Hz == RATING HEADROOM POWER DISSIPATION Po =5W (THD = 0.1%) 0 dB 3.5 W 12 dB 2.0 W P ALL P tot factor ----------------- 5 15.85 --------------- 315 mW == = |
Codice articolo simile - TDA1517ATW |
|
Descrizione simile - TDA1517ATW |
|
|
Link URL |
Privacy Policy |
ALLDATASHEETIT.COM |
Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore 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 |