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STK4067 数据表(PDF) 3 Page - Sanyo Semicon Device |
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STK4067 数据表(HTML) 3 Page - Sanyo Semicon Device |
3 / 8 page STK4067 No. 4376-3/8 STK4067 Design Data (1) The Protection Circuits a) Overvoltage Protector Since the STK4067 is designed for car stereo applications, VCC max for operating mode is set to 18 V. Exceeding the VCC maximum level activates the overvoltage protector and the circuit switches to an off-state and delivers no output. The overvoltage protection circuit is set for a functional range from 18 to 28 V; 100% operation at 28 V. For this reason, you should be careful not to exceed the 18 V limit in quiescent mode and keep in mind AC line regulations when setting using a transformer power supply for designs such as home stereo systems. Exceeding 18 V activates the overvoltage protector and results in the generation of abnormal sounds. b) Thermal Shutdown The thermal shutdown protection circuit is designed to first detect abnormal temperature rises which occur during abnormal operation (such as load shorts) and then prevent damage to the IC by limiting the input signal; thereby preventing a further rise in the temperature. The thermal shutdown protector is set to activate at substrate temperature of 135°C with a complete shutdown by switching to an off-state if temperatures rise to 175°C. Under normal application, the IC is equipped with a heat sink and the temperature never reaches a level resulting in a complete off-state switch and saturation occurs at a specific temperature. For example, when a short occurs with an IC mounted 4.5°C/W heat sink, saturation is achieved at approximately 160°C. At this point, Tj exceeds its maximum rating of 170°C. As previously mentioned, this circuit is designed to protect the IC from damage sustained in a short period of time and you should note that the protection circuit will not protect the IC if abnormal temperature rises occur over a long period of time. (2) Precautions a) Excessive Input If a 1 V or greater (f = 1 kHz.rms) overinput is applied to the input pin, the DC balance of the input channel for the input monolithic amplifier is disrupted and output is cut off. In addition, DC voltage is generated on the output pins and causes damage to the speakers. Proper caution should be displayed in preventing input above this voltage. b) Parasitic Oscillation The STK4067 performs phase compensation using 2.2 Ω and 0.47µF between V CC and the bootstrap pins. Under such conditions, the power supply line must be in a close proximity to the bootstrap pins for the inverting and non-inverting amplifiers. If the power line is too long, parasitic oscillation is likely to occur at low temperatures. If such a problem arises, add a 0.1µF rated condenser between the ground and the head of the power supply line in order to lower the impedance. c) Power Supply Voltage Inverse Application The STK4067 is not equipped with a built-in power supply voltage inversion protection circuit. If the possibility exists, one should be externally connected. d) Power Off Do not connect pin 1 of the VCC pin directly to the ground or else the IC will be damaged. When connecting pin 1, install a resistor rated for 100 Ω or greater in series with pin 1, or you may place a diode between pin 10 and pin 1. (3) Application Circuits a) The under frequency band may be magnified, for applications using a booster amplifier or woofer driver amplifier, the bootstrap condensers (C3 and C4) can be changed from 220µF to 470µF. Refer to PO-f graphs. b) L1 = 3 µH and R3 = 4.7 Ω are for anti-oscillation applications against capacity loads. We recommend the use of this coil and resistor with the most compatible amplifier sets connected to general use speakers. This coil is not necessary when the load capacity is low using a chosen speaker connected to a radio-cassette player or active speaker. |
类似零件编号 - STK4067 |
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类似说明 - STK4067 |
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