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LA4917H 数据表(PDF) 6 Page - Sanyo Semicon Device

部件名 LA4917H
功能描述  Monolithic Linear IC Audio Output for TV application High-Effciency Two-Channel 7W BTL Power Amplifier ICs
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制造商  SANYO [Sanyo Semicon Device]
网页  https://www.sanyo-av.com/us/
标志 SANYO - Sanyo Semicon Device

LA4917H 数据表(HTML) 6 Page - Sanyo Semicon Device

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LA4917H
No.A0322-6/8
Tj Monitor
14
1k
Notes on the Standby Function (STB, pin 4)
The amplifier is turned on by applying a level of 2.5V
(minimum) or higher to pin 4.
Pin 4 control voltage
Voltage applied to pin 4 (V)
Amplifier
Standby
0 to 1.0
Off
On
2.5 to 16
On
Off
The limit resistor RSTB may be inserted if the VST applied
voltage is comparatively high and there is a need to suppress
the pin 4 sink current.
Example : When it is necessary to limit the pin 4 sink current
to under 500
µA.
RSTB =
VST-2VBE (about 1.4V)
500
µA
-10k
Notes on the Self Diagnostics Function (PRO OUT, pin 1)
The self diagnostics function detects when a power amplifier
output pin has been shorted to VCC or ground and reports that
state to external circuits.
In the example shown at the right, during normal operation
this output will be at the high level, but if the protection
circuit operates, an internal transistor will be turned on and
the pin will go to the low level (about 0.2 to 0.3V).
Note that this circuit has an npn transistor open-collector
output.
* : This pin is left open when this function is not used.
Notes on the TJ MONI Function (pin 14)
The pin 14 internal circuit has diodes (three diodes connected in series) connected to ground as shown in the circuit
diagram figure. These diodes' forward voltage has the temperature dependence shown in the figure at the lower left.
The IC's internal junction temperature can be inferred using these characteristics.
4
RSTB
VST
2VBE
10k
10k
30k
+5V
RPRO
Output short
protection circuit
1
1k
Junction temperature, Tj – ˚C
V14 -- Tj (Reference value)
0
1
1.5
2
2.5
0.5
0
50
100
150
200


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