lv4920h Sanyo Semiconductor Corporation, lv4920h Datasheet - Page 9

• Manufacturer Part Number: lv4920h
• Description: Class-d Audio Power Amplifier Power Cell Btl 15w?2ch, 10w?2ch
• Manufacturer: Sanyo Semiconductor Corporation

3. Protection Circuits
2.3 Power Down Sequence
3.1 Overcurrent protection circuit
The LV4920H has full complement of built-in protection circuits: overcurrent protection, thermal protection, and low
power supply voltage protection circuits.
The power shut-down sequence must be controlled by timing as shown below (PWM=BD mode) to minimize
impulse noise.
The overcurrent protection circuit protects the output transistors by detecting current that exceeds a predetermined
value due to load shorting, shorting to power, shorting to ground, etc.
When the protection circuit is activated, both the high- and low-side output transistors are turned off and the
output is placed in a high-impedance state.
The figure below shows the waveform of current that flows when load shorting (1Ω) occurs.
Overcurrent hold time (approx. 20µs)
LV4920H
-3.8A
+3.8A
No.A0989-9/12