TDA8566TH/N2,512

Overview

The TDA8566TH/N2,512 is an integrated Class-B output amplifier designed for stereo BTL car radio applications. It features two amplifiers in a 20-lead HSOP20 plastic package (SOT418-3). The device delivers 2 × 25 W into a 4 Ω load or 2 × 40 W into a 2 Ω load at 1 kHz with 10% THD. Operating supply voltage ranges from 6 V to 18 V, with a typical quiescent current of 115 mA and standby current of 0.1 mA. It includes differential inputs, fixed gain of 26 dB, and open-collector diagnostic outputs for short-circuit and temperature monitoring.

Feature Summary

• Integrated Bridge-Tied Load (BTL) configuration with differential input stage and high common mode rejection ratio.
• Diagnostic facility providing distortion, short-circuit, and temperature pre-warning via open-collector outputs.
• Robust protection mechanisms including load dump protection, reverse polarity safety, and thermal shutdown.
• Mode select switch enabling operating, mute, and standby states with low power consumption.

Applications

• Stereo BTL car radio power amplification
• Automotive audio systems requiring differential inputs
• Applications needing integrated short-circuit and thermal diagnostics

Procurement Notes

Verify the specific ordering suffix /N2,512 against the manufacturer's current product status, as automotive components may undergo lifecycle changes. Confirm that the HSOP20 package variant matches the intended PCB footprint and thermal requirements. Ensure compatibility with the required supply voltage range and load impedance specifications for the target vehicle audio architecture.

Selection Notes

Select this component for designs requiring a fixed-gain, high-power stereo amplifier with minimal external components. The differential input stage simplifies interface with audio sources while maintaining noise immunity. Consider the available diagnostic pins if system monitoring for faults such as clipping or overheating is required. Verify that the 20-lead package size fits within the constrained space of automotive head unit enclosures.

Part Context

The TDA8566 series comprises integrated Class-B output amplifiers available in multiple packages, including the 20-lead HSOP20 (TDA8566TH), 24-lead HSOP24 (TDA8566TH1), and 17-pin DIL-bent-SIL (TDA8566Q). The TDA8566TH1 is pin-compatible with the I2C-controlled TDA1566TH for board layout flexibility. This family is specifically engineered for robust performance in automotive environments.

Replacement Considerations

The TDA8566TH1 is pin-compatible with the TDA1566TH for single-board layout purposes. No other direct substitutes are explicitly confirmed in the provided documentation.

FAQ

How does the TDA8566 handle switch-on plops?

To avoid switch-on plops, the amplifier should be kept in mute mode for at least 150 ms during startup to allow input capacitors to charge. This can be achieved using a microcontroller or an external timing circuit.

What is the function of the DIAG pin?

The DIAG pin provides short-circuit and temperature pre-warning diagnostics. It goes continuously LOW during a short-circuit condition or when the virtual junction temperature reaches 145 °C.

Can the CLIP and DIAG pins be connected together?

Yes, both the CLIP and DIAG pins are open-collector outputs and can be tied together. An external pull-up resistor is required for proper operation.