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TDA8922B 2 · 50 W class-D power ampliﬁer Rev. 01 — 1 October 2004 Preliminary data sheet 1. General description 2. Features The TDA8922B is a high efﬁciency class-D audio power ampliﬁer with very low dissipation. The typical output power is 2 · 50 W. The device is available in the HSOP24 power package and in the DBS23P through-hole power package. The ampliﬁer operates over a wide supply voltage range from – 12.5 V to – 30 V and consumes a very low quiescent current. n Zero dead time switching n Advanced current protection: output current limiting n Smooth start-up: no pop-noise due to DC offset n High efﬁciency n Operating supply voltage from – 12.5 V to – 30 V n Low quiescent current n Usable as a stereo Single-Ended (SE) ampliﬁer or as a mono ampliﬁer in Bridge-Tied Load (BTL) n Fixed gain of 30 dB in Single-Ended (SE) and 36 dB in Bridge-Tied Load (BTL) n High supply voltage ripple rejection n Internal switching frequency can be overruled by an external clock n Full short-circuit proof across load and to supply lines n Thermally protected. 3. Applications n Television sets n Home-sound sets n Multimedia systems n All mains fed audio systems n Car audio (boosters).

Philips Semiconductors 4. Quick reference data TDA8922B 2 · 50 W class-D power ampliﬁer Conditions Min Typ Max Unit – 12.5 - – 26 50 – 30 65 V mA - - - 50 25 88 - - - W W W Quick reference data Table 1: Symbol Parameter General; VP = – 26 V VP Iq(tot) supply voltage total quiescent supply current no load; no ﬁlter; no RC-snubber network connected output power Stereo single-ended conﬁguration RL = 6 W Po VP = – 26 V RL = 8 W VP = – 21 V Mono bridge-tied load conﬁguration Po output power ; THD = 10 %; ; THD = 10 %; RL = 8 W VP = – 21 V ; THD = 10 %; 5. Ordering information Table 2: Type number Package Ordering information Name TDA8922BTH HSOP24 TDA8922BJ DBS23P Description plastic; heatsink small outline package; 24 leads; low stand-off height plastic DIL-bent-SIL power package; 23 leads (straight lead length 3.2 mm) Version SOT566-3 SOT411-1 9397 750 13357 Preliminary data sheet Rev. 01 — 1 October 2004 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 2 of 32

Philips Semiconductors 6. Block diagram TDA8922B 2 · 50 W class-D power ampliﬁer VDDA2 VDDA1 STABI PROT VDDP2 VDDP1 3 (20) 10 (4) 18 (12) 13 (7) 23 (16) 14 (8) 15 (9) BOOT1 IN1M IN1P SGND1 OSC MODE SGND2 IN2P IN2M 9 (3) 8 (2) 11 (5) 7 (1) 6 (23) 2 (19) 5 (22) 4 (21) INPUT STAGE mute MODE mute INPUT STAGE PWM MODULATOR STABI RELEASE1 SWITCH1 ENABLE1 CONTROL AND HANDSHAKE DRIVER HIGH DRIVER LOW 16 (10) OUT1 OSCILLATOR MANAGER TEMPERATURE SENSOR CURRENT PROTECTION VOLTAGE PROTECTION TDA8922BTH (TDA8922BJ) VSSP1 VDDP2 ENABLE2 SWITCH2 RELEASE2 CONTROL AND HANDSHAKE DRIVER HIGH DRIVER LOW PWM MODULATOR 22 (15) BOOT2 21 (14) OUT2 1 (18) 12 (6) VSSA2 VSSA1 24 (17) 19 (-) VSSD n.c. 17 (11) 20 (13) coa022 VSSP1 VSSP2 (1) Pin numbers in parenthesis refer to the TDA8922BJ. Fig 1. Block diagram. 9397 750 13357 Preliminary data sheet Rev. 01 — 1 October 2004 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 3 of 32

Philips Semiconductors 7. Pinning information 7.1 Pinning VSSD VDDP2 BOOT2 OUT2 VSSP2 n.c. STABI VSSP1 OUT1 BOOT1 VDDP1 PROT 24 23 22 21 20 19 18 17 16 15 14 13 TDA8922BTH 1 2 3 4 5 6 7 8 9 10 11 12 VSSA2 SGND2 VDDA2 IN2M IN2P MODE OSC IN1P IN1M VDDA1 SGND1 VSSA1 001aab170 TDA8922B 2 · 50 W class-D power ampliﬁer OSC IN1P IN1M VDDA1 SGND1 VSSA1 PROT VDDP1 BOOT1 OUT1 VSSP1 STABI VSSP2 OUT2 BOOT2 VDDP2 VSSD VSSA2 SGND2 VDDA2 IN2M IN2P MODE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 TDA8922BJ Fig 2. Pin conﬁguration TDA8922BTH. Fig 3. Pin conﬁguration TDA8922BJ. 001aab171 7.2 Pin description Table 3: Symbol VSSA2 SGND2 VDDA2 IN2M IN2P MODE OSC IN1P IN1M VDDA1 Pin description Pin TDA8922BTH TDA8922BJ 1 2 3 4 5 6 18 19 20 21 22 23 7 8 9 10 1 2 3 4 Description negative analog supply voltage for channel 2 signal ground for channel 2 positive analog supply voltage for channel 2 negative audio input for channel 2 positive audio input for channel 2 mode selection input: Standby; Mute or Operating mode oscillator frequency adjustment or tracking input positive audio input for channel 1 negative audio input for channel 1 positive analog supply voltage for channel 1 9397 750 13357 Preliminary data sheet Rev. 01 — 1 October 2004 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 4 of 32

Philips Semiconductors TDA8922B 2 · 50 W class-D power ampliﬁer Table 3: Symbol SGND1 VSSA1 PROT VDDP1 BOOT1 OUT1 VSSP1 STABI n.c. VSSP2 OUT2 BOOT2 VDDP2 VSSD Pin description …continued Pin TDA8922BTH TDA8922BJ 11 12 13 14 15 16 17 18 19 20 21 22 23 24 5 6 7 8 9 10 11 12 - 13 14 15 16 17 Description signal ground for channel 1 negative analog supply voltage for channel 1 decoupling capacitor for protection (OCP) positive power supply voltage for channel 1 bootstrap capacitor for channel 1 PWM output from channel 1 negative power supply voltage for channel 1 decoupling of internal stabilizer for logic supply not connected negative power supply voltage for channel 2 PWM output from channel 2 bootstrap capacitor for channel 2 positive power supply voltage for channel 2 negative digital supply voltage 8. Functional description 8.1 General The TDA8922B is a two channel audio power ampliﬁer using class-D technology. The audio input signal is converted into a digital Pulse Width Modulated (PWM) signal via an analog input stage and PWM modulator. To enable the output power transistors to be driven, this digital PWM signal is applied to a control and handshake block and driver circuits for both the high side and low side. In this way a level shift is performed from the low power digital PWM signal (at logic levels) to a high power PWM signal which switches between the main supply lines. A 2nd-order low-pass ﬁlter converts the PWM signal to an analog audio signal across the loudspeakers. The TDA8922B one-chip class-D ampliﬁer contains high power D-MOS switches, drivers, timing and handshaking between the power switches and some control logic. For protection a temperature sensor and a maximum current detector are built-in. The two audio channels of the TDA8922B contain two PWMs, two analog feedback loops and two differential input stages. It also contains circuits common to both channels such as the oscillator, all reference sources, the mode functionality and a digital timing manager. The TDA8922B contains two independent ampliﬁer channels with high output power, high efﬁciency, low distortion and a low quiescent current. The ampliﬁer channels can be connected in the following conﬁgurations: • Mono Bridge-Tied Load (BTL) ampliﬁer • Stereo Single-Ended (SE) ampliﬁers. 9397 750 13357 Preliminary data sheet Rev. 01 — 1 October 2004 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 5 of 32

Philips Semiconductors TDA8922B 2 · 50 W class-D power ampliﬁer The ampliﬁer system can be switched in three operating modes with pin MODE: • Standby mode; with a very low supply current • Mute mode; the ampliﬁers are operational; but the audio signal at the output is suppressed by disabling the VI-converter input stages • Operating mode; the ampliﬁers fully are operational with output signal. To ensure pop-noise free start-up the DC output offset voltage is applied gradually to the output between Mute mode and Operating mode. The bias current setting of the VI converters is related to the voltage on the MODE pin; in Mute mode the bias current setting of the VI converters is zero (VI converters disabled) and in Operating mode the bias current is at maximum. The time constant required to apply the DC output offset voltage gradually between mute and operating can be generated via an RC-network on the MODE pin. An example of a switching circuit for driving pin MODE is illustrated in Figure 4. If the capacitor C is left out of the application the voltage on the MODE pin will be applied with a much smaller time-constant, which might result in audible pop-noises during start-up (depending on DC output offset voltage and used loudspeaker). In order to fully charge the coupling capacitors at the inputs, the ampliﬁer will remain automatically in the Mute mode before switching to the Operating mode. A complete overview of the start-up timing is given in Figure 5. +5 V R R standby/ mute mute/on C MODE pin SGND 001aab172 Fig 4. Example of mode selection circuit. 9397 750 13357 Preliminary data sheet Rev. 01 — 1 October 2004 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 6 of 32

Philips Semiconductors TDA8922B 2 · 50 W class-D power ampliﬁer audio output modulated PWM operating Vmode > 4.2 V 50 % duty cycle 2.2 V < Vmode < 3 V mute 0 V (SGND) standby 100 ms 50 ms > 350 ms time audio output modulated PWM operating Vmode > 4.2 V 50 % duty cycle 2.2 V < Vmode < 3 V mute 0 V (SGND) standby 100 ms 50 ms > 350 ms time coa024 When switching from standby to mute, there is a delay of 100 ms before the output starts switching. The audio signal is available after Vmode has been set to operating, but not earlier than 150 ms after switching to mute. For pop-noise free start-up it is recommended that the time constant applied to the MODE pin is at least 350 ms for the transition between mute and operating. When switching directly from standby to operating, there is a ﬁrst delay of 100 ms before the outputs starts switching. The audio signal is available after a second delay of 50 ms. For pop-noise free start-up it is recommended that the time constant applied to the MODE pin is at least 350 ms for the transition between standby and operating Fig 5. Timing on mode selection input. 9397 750 13357 Preliminary data sheet Rev. 01 — 1 October 2004 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 7 of 32

Philips Semiconductors TDA8922B 2 · 50 W class-D power ampliﬁer 8.2 Pulse width modulation frequency The output signal of the ampliﬁer is a PWM signal with a carrier frequency of approximately 317 kHz. Using a 2nd-order LC demodulation ﬁlter in the application results in an analog audio signal across the loudspeaker. This switching frequency is ﬁxed by an external resistor ROSC connected between pin OSC and VSSA. An optimal setting for the carrier frequency is between 300 kHz and 350 kHz. Using an external resistor of 30 kW 317 kHz. on the OSC pin, the carrier frequency is set to If two or more class-D ampliﬁers are used in the same audio application, it is advisable to have all devices operating at the same switching frequency by using an external clock circuit. 8.3 Protections The following protections are included in TDA8922B: • OverTemperature Protection (OTP) • OverCurrent Protection (OCP) • Window Protection (WP) • Supply voltage protections: – UnderVoltage Protection (UVP) – OverVoltage Protection (OVP) – UnBalance Protection (UBP). The reaction of the device on the different fault conditions differs per protection: 8.3.1 OverTemperature Protection (OTP) If the junction temperature Tj > 150 C, then the power stage will shut-down immediately. The power stage will start switching again if the temperature drops to approximately 130 C, thus there is a hysteresis of approximately 20 C. 8.3.2 OverCurrent Protection (OCP) When the loudspeaker terminals are short-circuited or if one of the demodulated outputs of the ampliﬁer is short-circuited to one of the supply lines, this will be detected by the OverCurrent Protection (OCP). If the output current exceeds the maximum output current of 5 A, this current will be limited by the ampliﬁer to 5 A while the ampliﬁer outputs remain switching (the ampliﬁer is NOT shut-down completely). The ampliﬁer can distinguish between an impedance drop of the loudspeaker and low-ohmic short across the load. In the TDA8922B this impedance threshold (Zth) depends on the supply voltage used. When a short is made across the load causing the impedance to drop below the threshold level (< Zth) then the ampliﬁer is switched off completely and after a time of 100 ms it will try to restart again. If the short circuit condition is still present after this time this cycle will be repeated. The average dissipation will be low because of this low duty cycle. 9397 750 13357 Preliminary data sheet Rev. 01 — 1 October 2004 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 8 of 32

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