Overview

The TDA7297 (packaged in a 15-pin vertical Multiwatt power package TDA7297V) is a 15 W+15 W15\text{ W} + 15\text{ W} dual bridge audio power amplifier IC manufactured by STMicroelectronics. Extremely popular on low-cost 12 V12\text{ V} DIY stereo amplifier breakout boards, it delivers 15 W15\text{ W} continuous RMS power per channel into 8 Ω8\ \Omega speakers from a single DC supply.

Because the TDA7297 uses a Bridge-Tied Load (BTL) output topology on both channels, it drives speakers directly between output terminal pairs without requiring large, expensive AC coupling capacitors.

Quick reference

Amplifier TypeDual BTL Class-AB Stereo Audio Power Amplifier
PackageMultiwatt-15 (15-Pin Vertical Power Package) / Stereo Module
Supply Voltage Range (VCCV_{CC})6.0 V6.0\text{ V} to 18.0 V18.0\text{ V} DC (12.0 V…16.5 V12.0\text{ V} \dots 16.5\text{ V} recommended)
Output Power (POUTP_{OUT})15 W+15 W15\text{ W} + 15\text{ W} RMS (VCC=16.5V,RL=8Ω,THD=10%V_{CC} = 16.5\text{V}, R_L = 8\Omega, \text{THD} = 10\%)
Recommended Speaker Load4 Ω4\ \Omega to 8 Ω8\ \Omega
Total Harmonic Distortion0.1%0.1\% typical (PO=1W,f=1kHzP_O = 1\text{W}, f = 1\text{kHz})
Control FunctionsMicroprocessor-compatible Mute and Standby control pins

Pinout (Multiwatt-15 Package)

text
       ┌───────────────────────────────┐
       │            TDA7297            │  (Front Package Face)
       └─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬──┬──┬──┬──┘
         1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
PinNameDescription
1OUT1+Channel 1 Positive BTL Output
2OUT1-Channel 1 Negative BTL Output
3VCC1Channel 1 Power Supply (+6V to +18V DC)
4IN1Channel 1 Audio Signal Input (via 220nF coupling cap)
5MUTEMute Control Input (High = Play, Low = Muted)
6ST-BYStandby Control Input (High = Normal, Low = Standby Low-Power)
7S-GNDSignal Ground reference
8, 9PW-GNDPower Ground 1 and 2
10SVRSupply Voltage Ripple Rejection (10µF cap to GND)
11IN2Channel 2 Audio Signal Input (via 220nF coupling cap)
12N.C.No Connection
13VCC2Channel 2 Power Supply (+6V to +18V DC)
14OUT2-Channel 2 Negative BTL Output
15OUT2+Channel 2 Positive BTL Output

Specifications

ParameterSymbolMinTypMaxUnitConditions
Supply Voltage RangeVCCV_{CC}6.012.018.0VOperating DC supply
Continuous Output PowerPOUTP_{OUT}13.015.0—WVCC=16.5V,RL=8Ω,THD=10%V_{CC} = 16.5\text{V}, R_L = 8\Omega, \text{THD} = 10\%
Total Harmonic DistortionTHD\text{THD}—0.10.3%POUT=1W,f=1kHz,RL=8ΩP_{OUT} = 1\text{W}, f = 1\text{kHz}, R_L = 8\Omega
Signal-to-Noise RatioSNRSNR8090—dBf=1kHzf = 1\text{kHz}
Quiescent CurrentIQI_Q—5065mANo signal
Standby CurrentISTBYI_{STBY}—100300μA\mu\text{A}VSTBY≤1.5VV_{STBY} \le 1.5\text{V}

Typical Application Circuit (12V Stereo Amplifier)

text
       +12V DC Supply ────┬─── [Pin 3: VCC1] & [Pin 13: VCC2]
                          │
       Audio IN1 ── [220nF Cap] ── [Pin 4: IN1] ─── TDA7297 ─── [Pin 1: OUT1+] ──── ( Speaker 1 + )
                                                  │             [Pin 2: OUT1-] ──── ( Speaker 1 - )
                                                  │
       Audio IN2 ── [220nF Cap] ── [Pin 11: IN2] ──│─────────── [Pin 15: OUT2+] ─── ( Speaker 2 + )
                                                  │             [Pin 14: OUT2-] ─── ( Speaker 2 - )
                          GND ─── [Pin 8/9: PW-GND] & [Pin 7: S-GND]

Common mistakes

  • Shorting speaker negative outputs (OUT-) to GND: Because the TDA7297 uses Bridge-Tied Load outputs, both output terminals (OUT+ and OUT-) carry DC bias. NEVER connect speaker negative terminals to GND or to each other.
  • Operating without a heatsink: Generating 30W total output power requires an aluminum heatsink mounted to the Multiwatt-15 package tab. Running without a heatsink triggers thermal shutdown within seconds.

Notes

  • TDA7297 vs TDA2030: The TDA7297 is a dual-channel BTL amplifier (no output coupling caps required), whereas the TDA2030 is a single-channel amplifier.

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