TDA8566TH/N2C,112

Overview

The TDA8566TH/N2C,112 is an integrated Class-B output amplifier designed for stereo BTL car radio applications. It features two amplifiers in a Bridge-Tied Load configuration with differential inputs and diagnostic outputs. The device delivers 2 × 25 W into a 4 Ω load or 2 × 40 W into a 2 Ω load at 14.4 V supply voltage. It operates within a supply voltage range of 6 V to 18 V, with a typical quiescent current of 115 mA and standby current of 0.1 mA. The input impedance is typically 120 kΩ differentially.

Feature Summary

• Differential input stage providing very high common mode rejection ratio and high common mode input signal handling capability.
• Integrated diagnostic facility including open-collector outputs for short-circuit detection, temperature pre-warning, and clip detection.
• Robust protection mechanisms including load dump protection, reverse polarity safety, electrostatic discharge protection, and thermal shutdown.
• Mode select switch functionality allowing operation, mute, and standby states with low power consumption in standby.

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 N2C against the manufacturer's latest documentation to confirm material declaration, RoHS compliance status, and REACH SVHC declarations. Ensure the package type HSOP20 (SOT418-3) matches the intended PCB footprint and thermal management requirements. Confirm availability status as product lifecycles may change.

Selection Notes

Select this component for automotive audio designs requiring a fixed gain of 26 dB and high output power in a compact plastic heatsink package. Consider the differential input requirement and the need for external pull-up resistors for the open-collector diagnostic pins. Evaluate thermal resistance characteristics for adequate heat dissipation under maximum load conditions.

Part Context

The TDA8566 series includes variants such as the TDA8566TH1 in a 24-lead package pin-compatible with the I2C-controlled TDA1566TH, and the TDA8566Q in a 17-pin DIL-bent-SIL package. The TH variant specifically utilizes a 20-lead small outline plastic package designed for efficient thermal performance in automotive environments.

Replacement Considerations

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

FAQ

How does the device handle switch-on plops?

To avoid switch-on plops, it is advisable to keep the amplifier in the mute mode for a period of at least 150 ms to allow charging of the input capacitors before switching to operating mode.

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, provided an external pull-up resistor is used.