LV4904V SANYO [Sanyo Semicon Device], LV4904V Datasheet - Page 14

• Manufacturer Part Number: LV4904V
• Description: Digital Input Class-D Power Amplifier
• Manufacturer: SANYO [Sanyo Semicon Device]

4.2 Overcurrent protection circuit
Figure 4.2.2 Graphical representation of overcurrent protection circuit operation (enlarged)
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.
Figure 4.2.1 Graphical representation of overcurrent protection circuit operation
Internal Control Signal
Output Current
Output Current
Internal Control Signal
IDETECT
Control
Operation
Self-recovery &
Normal Operation
LV4904V
HOLD TIME
No.A1963-14/25