YDA136 datasheet(21/32 Pages) YAMAHA

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YDA136

■

Protect Function

●Over Current Detection Function

YDA136 has a function to perform an over current protection by detecting a voltage drop of the current detection resistor

connected to the source side of PowerMOSFET.

When the voltage of an over-current detection terminal fulfills the following conditions, it judges that it is in an over-current

condition, and becomes over-current detection mode, and then a circuit is protected.

Voltage to be monitored

Over-current detection

mode threshold

Low-Side over-current detection terminal (OCPLL, OCPLR） Voltage

< VOC2

High-Side over-current detection terminal（OCPHL, OCPHR） Voltage and VBB Potential difference

> VOC1

In the example of peripheral circuit connection, the following four over-current conditions are detected, and then it becomes

an over-current detection mode.

・

A condition in which signals after LC filter and VSS power supply is shorted.

・

A condition in which signals after LC filter of non-inverted side and signals after LC filter of inverted side is

shorted.

・

A condition in which one side of a speaker was connected to LC filter, and another side of a speaker is shorted to

the VSS power supply.

In over-current detection mode, PROTN terminal is set to “L”, simultaneously it turns off all PowerMOSFET (hard mute)

and protects a circuit.

After it is made to over-current detection mode, even if an over-current condition is canceled, it is not canceled but is held

as it is.

Over-current detection mode can be canceled by intercepting a power supply or setting a PRSTN terminal to “L” at once.

●Power Detection Function

YDA136 monitors the following three kinds voltage.

When which voltage is less than regular voltage, it becomes low voltage detection mode.

Voltage to be monitored

Constant Voltage Detection Mode Threshold

IBB Terminal Voltage(It is proportional to the

voltage between VBB and VSS)

VIB2

VDD1 (Voltage between VBB and VBS)

VVB2

VDD2 (Voltage between VDD and VSS)

VVD2

Here, since the IBB terminal has input the signal which divided VBB voltage, the IBB terminal will act as the monitor of

the VBB voltage.

Hard mute is operated in low voltage detection mode.

Among these, all registers are reset when VDD2 voltage is less than threshold voltage (VVD2).

Then, when three kinds of power supply voltage rises and a low voltage detection mode threshold is exceeded altogether,

the low voltage detection mode is canceled and a hard mute is also canceled after starting standby time (TWAIT).

●Starting Standby Time Setup

Starting standby time (TWAIT) can be set up by connecting a capacitor to the DET terminal of YDA136.

Be sure to set up to usually be set to TWAIT>=600msec for internal initialization of YDA136.

The value of starting standby time (TWAIT) and capacity (CDET) of and the capacitor linked to a DET terminal serves as the

following relations.

WAIT = ６０(kΩ)×CDET(F)

In the case of the capacity value (10μF) of the capacitor in the example of peripheral circuit connection, TWAIT is set to

600msec.

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