LV4904VGEVB 데이터 시트보기 (PDF) - ON Semiconductor

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LV4904VGEVB

Digital Input Class-D Power Amplifier

ON Semiconductor 

4.3 Thermal protection circuit

LV4904V

The thermal protection circuit is designed to safeguard the ICs from damage or deterioration when the ICs have

generated abnormally high levels of heat. When inadequate heat dissipation, a faulty wiring connection or other factor

has caused the IC junction temperature (Tj) to rise beyond its rating, the thermal protection circuit sets both the high

and low sides of the output transistors to OFF and places the output in the high-impedance state. When, after shutdown,

the junction temperature has dropped, the IC is automatically recovered. The attack and recovery temperatures of the

circuit are provided with hysteresis to prevent unstable operation near the threshold temperature where the thermal

protection circuit is continuously set to ON and OFF.

However, the thermal protection circuit is a function that temporarily prevents abnormal internal heat generation and

does not guarantee that the ICs will not be damaged. Similarly, the operating temperature of the thermal protection

circuit is not a guaranteed value. Figure 4.3 is a graphical representation of the thermal protection circuit.

Output Current

Control Operation

Internal Control Signal

Self-Recovery &

Nomal Operation

Figure 4.3 Thermal protection circuit operation

No.A1963-15/25

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