Specifications For The Protection Circuits - Pioneer HTP-SB300 Service Manual

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5.3 SPECIFICATIONS FOR THE PROTECTION CIRCUITS

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Protection Activation Conditions for the Sound Bar Adapter
The DC output from the adapter will be shut off if the 24-V DC output load becomes 6.4 A (max. current limitation) or
higher (based on 90-V AC power).
On the Protection Functions of the Sound Bar
1. Protection Activation Conditions for the TAS5342A
• Max. current limitation: 7.1 A or higher
• /OTW: If the temperature becomes 125 °C or higher, the Over Temperature Protection function will be activated.
• /SD: In a case of undervoltage or overload, the Shutdown Protection will be activated.
SD
0
0
1
1
2. Over Temperature Protection (MICOM Pin 88)
• In Normal Operation mode: High
In a case where the temperature of the AMP IC (IC122 or IC123) becomes 125 °C or higher: Low
The signal from Pin 14 of IC120 (TAS5508) is set to low in order to mute the PWM output.
Muting of the PWM output is canceled when /OTW is returned to high.
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3. On the AMP Shutdown Protection Function (AMP IC [IC122, IC123] Pin 5) (/SD)
• In Normal Operation mode: High
• In a case of undervoltage or overload: Low
When this signal is input to the MICOM, the audio signal will be muted and the system will enter STANDBY mode.
On the Protection Functions of the Subwoofer
In a case of excess current or excess temperature at the AMP IC (IC702: STA326), the protection function will be
activated then deactivated in the AMP IC, according to the internally set programmable recovery time (100 ms), as shown
below:
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1) After a shutdown, the PWM output will be OFF for 100 msec (the set recovery time).
2) The system will enter Normal mode to detect operating conditions.
3) If the condition that caused the shutdown still remains, the protection function will be reactivated, according to the set
recovery time. .
No LED display nor power-off operation will be activated in the subwoofer while the protection function is activated.
Therefore, if no sound is output even if the LED is lit in green, the protection function may have been activated.
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OTW
0 Over temperature (OTE) or overload (OLP) or under voltage (UVP)
1 Overload (OLP) or under voltage (UVP)
0 Junction temperature higher than 125 °C (over temperature warning)
1 Junction temperature lower than 100 °C and no OLP or UVP faults (normal operation)
IC113 (MICOM)
2
Pin 86 (/TAS_MUTE)
High → Low
1
Pin 88 (/TAS_OTW)
High → Low
IC113 (MICOM)
Pin 89 (/TAS_SD)
2
STANDBY
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2 9
8
Description
IC120 (TAS5508)
Q Q
3 6 7 1 3 1 5
Pin 14 (/TAS_MUTE)
1 High → Low
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.
HTP-SB300
7
8
9 4 2 8
IC122 (TAS5342A)
0 5 8 2 9 9 4 2 8
Pin 2 (/OTW)
IC123 (TAS5342A)
Pin 2 (/OTW)
IC122 (TAS5342A)
Pin 5 (/SD)
IC123 (TAS5342A)
Pin 5 (/SD)
m
8
9 9
A
B
C
9 9
D
E
F
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