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LA4917H 数据表(PDF) 6 Page - Sanyo Semicon Device |
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LA4917H 数据表(HTML) 6 Page - Sanyo Semicon Device |
6 / 8 page LA4917H No.A0322-6/8 Tj Monitor 14 1k Ω 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 Ω 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 Ω 10k Ω 30k Ω +5V RPRO Output short protection circuit 1 1k Ω Junction temperature, Tj – ˚C V14 -- Tj (Reference value) 0 1 1.5 2 2.5 0.5 0 50 100 150 200 |
类似零件编号 - LA4917H |
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类似说明 - LA4917H |
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