LV4904VGEVB 查看數據表（PDF） - ON Semiconductor

零件编号

产品描述 (功能)

生产厂家

LV4904VGEVB

Digital Input Class-D Power Amplifier

ON Semiconductor 

4.2 Overcurrent protection circuit

LV4904V

The overcurrent protection circuit is for protecting the output transistors from overcurrent. When it has detected an

overcurrent caused by shorting to power, shorting to ground or load shorting and the current level has reached 6A or so,

it turns off the output transistors for approximately 20 µsec. About 20 µsec after the output transistors have been turned

off, normal operation is recovered automatically, and if another overcurrent is detected, it performs the protection

operation again. However, this protection operation is a function that temporarily prevents an overcurrent trouble state

and it does not guarantee that the ICs will not be damaged. Figures 4.2.1 and 4.2.2 show the operating models of the

overcurrent protection circuit.

Output Current

Control

Self-recovery &

Operation Normal Operation

Internal Control Signal

Figure 4.2.1 Graphical representation of overcurrent protection circuit operation

IDETECT

Output Current

Internal Control Signal

HOLD TIME

Figure 4.2.2 Graphical representation of overcurrent protection circuit operation (enlarged)

No.A1963-14/25

Share Link: