TDA1558Q/N1,112

Overview

The TDA1558Q is a monolithic integrated Class-B output amplifier designed for car radio applications. It provides four identical amplifiers capable of delivering 2 x 22 W in stereo BTL mode or 4 x 11 W in quad single-ended mode into 4 Ω loads at 10% THD. The device operates within a supply voltage range of 6.0 V to 18 V, with a typical quiescent current of 80 mA and stand-by current under 100 μA. It features fixed closed-loop voltage gain (39–47 dB depending on configuration), high ripple rejection, and low DC output offset voltage.

Feature Summary

• Integrated mute and stand-by switch functionality with low switching current requirements
• Robust protection mechanisms including thermal shutdown, reverse polarity safety, and short-circuit tolerance to ground and supply
• Flexible input architecture supporting both inverting and non-inverting connections for simplified circuit design
• High energy handling capability on outputs even when the supply voltage is zero

Applications

• Car radio power amplification
• Stereo bridge-tied load (BTL) audio systems
• Quad single-ended speaker driving configurations

Procurement Notes

Verify that the component matches the specified 17-lead DIL plastic package (SOT243R). Confirm the part number suffix corresponds to the standard product specification dated May 1992. Ensure the supplier provides documentation confirming compliance with the absolute maximum ratings, particularly regarding load dump protection limits and thermal resistance values.

Selection Notes

Select this amplifier for automotive audio designs requiring high output power with minimal external components. Consider the fixed gain characteristics and specific input impedance requirements when designing the preceding signal stage. Evaluate the thermal management needs based on the junction-to-case thermal resistance and expected ambient operating temperatures in vehicle environments.

Part Context

The TDA1558Q belongs to a family of Philips/NXP power amplifiers developed primarily for automotive use. It shares functional similarities with models like the TDA1551 and TDA1552 but offers distinct flexibility in configuring four channels as either two BTL pairs or four independent single-ended outputs. This versatility supports various car radio speaker layouts.

Replacement Considerations

TDA1558Q

FAQ

How does the TDA1558Q handle harmonic distortion at low frequencies?

Harmonic distortion at low frequencies can be decreased by connecting two diodes at pin 15 (internal reference voltage) to ground or using a 1.5 V zener diode.

What is the purpose of the SVRR pin?

The SVRR pin (Pin 4) is used for supply voltage ripple rejection, allowing the device to maintain performance despite fluctuations in the power supply voltage.