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LA4485 Datasheet(PDF) 18 Page - Sanyo Semicon Device

Part # LA4485
Description  5 W, Two-channel Power Amplifier with Very Few External Parts
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Manufacturer  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA4485 Datasheet(HTML) 18 Page - Sanyo Semicon Device

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Taking BTL coupling into consideration, the output-to-supply/output-to-ground protector is two-sided in order to protect both the
IC and the speaker.
When using this method (simultaneously shorting the outputs to supply and to ground)
In BTL mode, the IC protection function works even in noninverted output
→ output-to-supply mode, inverted output →
output-to-ground mode. (The reverse is also OK.)
Reference Value
(a) Short-circuit test for dual-mode operation after the main and standby switches are turned ON.
Conditions: 1 VCC =10to16 V,RL =4 Ω and PO = 1 to 5 W (variable) for load short-circuit
2 V
CC =10to16 V,RL =4 Ω, Rg = 0 (no signal) for output-to-supply short-circuit
3 V
CC =10to16 V,RL =4 Ω, Rg = 0 (no signal) for output-to-ground short-circuit.
Z: impedance
j: no device breakdown
1 Load short-circuit
2 Output-to-supply short-circuit
3 Output-to-ground short-circuit
One-time test
Repeated switching test
One-time test
Repeated switching test
Z=0
Z=0.5
Z=0
Z=0.5
Z=0
Z=0.5
Z=0
Z=0.5
j
jjjjjjjj
(b) Short-circuit test for dual-mode operation (opposite flow of (a)) after the main and standby switches are turned ON.
Conditions: same as (a)
j: No device breakdown
1 Load short-circuit
2 Output-to-supply short-circuit
3 Output-to-ground short-circuit
One-time test
Repeated switching test
One-time test
Repeated switching test
Z=0
Z=0.5
Z=0
Z=0.5
Z=0
Z=0.5
Z=0
Z=0.5
j
jjjjjjjj
(Note) Shorting the outputs to ground when muting is active can result in device breakdown.
Current
× voltage
detector
Self-holding
positive feedback
circuit
Reset circuit
CH1/CH2
Upper/lower
power transistor
control
Short-circuit to GND protection
1 Load short-circuit
2 Output-to-supply short-circuit
3 Output-to-ground short-circuit
.
BTL-mode short-circuit test circuit
Non-
inverting
Inverting
LA4485
No.3680-18/20


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