PDF 8920BJ Data sheet ( Hoja de datos )

Número de pieza	8920BJ
Descripción	TDA8920B
Fabricantes	NXP Semiconductors
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No Preview Available ! TDA8920B 2 × 100 W class-D power ampliﬁer Rev. 02 — 07 November 2005 Product data sheet 1. General description The TDA8920B is a high efﬁciency class-D audio power ampliﬁer with very low dissipation. The typical output power is 2 × 100 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 (±32 V non operating) and consumes a very low quiescent current. 2. Features s Zero dead time switching s Advanced current protection: output current limiting s Smooth start-up: no pop noise due to DC offset s High efﬁciency s Operating supply voltage from ±12.5 V to ±30 V s Low quiescent current s Usable as a stereo Single-Ended (SE) ampliﬁer or as a mono ampliﬁer in Bridge-Tied Load (BTL) s Fixed gain of 30 dB in Single-Ended (SE) and 36 dB in Bridge-Tied Load (BTL) s High output power s High supply voltage ripple rejection s Internal switching frequency can be overruled by an external clock s Full short-circuit proof across load and to supply lines s Thermally protected 3. Applications s Television sets s Home-sound sets s Multimedia systems s All mains fed audio systems s Car audio (boosters) 1 page Philips Semiconductors TDA8920B 2 × 100 W class-D power ampliﬁer Table 3: Pin description …continued Symbol Pin TDA8920BTH TDA8920BJ SGND1 11 5 VSSA1 PROT 12 13 6 7 VDDP1 14 BOOT1 15 8 9 OUT1 16 10 VSSP1 STABI 17 18 11 12 n.c. 19 - VSSP2 OUT2 20 21 13 14 BOOT2 22 15 VDDP2 VSSD 23 24 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 TDA8920B is a two channel audio power ampliﬁer using class-D technology. The audio input signal is converted into a digital pulse width modulated signal via an analog input stage and Pulse Width Modulation (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 TDA8920B 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 TDA8920B contain two PWM modulators, 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 TDA8920B 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 TDA8920B_2 Product data sheet Rev. 02 — 07 November 2005 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. 5 of 34 5 Page Philips Semiconductors TDA8920B 2 × 100 W class-D power ampliﬁer 8.4 Differential audio inputs For a high common mode rejection ratio and a maximum of ﬂexibility in the application, the audio inputs are fully differential. By connecting the inputs anti-parallel the phase of one of the channels can be inverted, so that a load can be connected between the two output ﬁlters. In this case the system operates as a mono BTL ampliﬁer and with the same loudspeaker impedance an approximately four times higher output power can be obtained. The input conﬁguration for a mono BTL application is illustrated in Figure 6. In the stereo single-ended conﬁguration it is also recommended to connect the two differential inputs in anti-phase. This has advantages for the current handling of the power supply at low signal frequencies. IN1P IN1M Vin IN2P IN2M OUT1 SGND OUT2 power stage mbl466 Fig 6. Input conﬁguration for mono BTL application 9. Limiting values Table 5: Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol Parameter Conditions Min VP supply voltage operating - non operating [1] - IORM repetitive peak current in output pin maximum output [2] 8 current limiting Tstg Tamb Tj storage temperature ambient temperature junction temperature −55 −40 - [1] Overvoltage protection might be activated. [2] Current limiting concept. See also Section 13.6. Max ±30 ±32 - +150 +85 150 Unit V V A °C °C °C TDA8920B_2 Product data sheet Rev. 02 — 07 November 2005 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. 11 of 34 11 Page

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