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STK433-320-E bảng dữ liệu(PDF) 10 Page - Sanyo Semicon Device |
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STK433-320-E bảng dữ liệu(HTML) 10 Page - Sanyo Semicon Device |
10 / 13 page STK433-290-E No. A1630-10/13 [STK433-300 series Stand-By Control Using Example] Characteristic • It can largely improve a pop noise to occur in power supply ON/OFF by using recommended Stand-By Control Application. • Because It can perform Stand-By Control by regulating limit resistance to the voltage such as used microcomputers, a set design is easy. (ex) STK433-300series test circuit. When impressed by Stand-by control control [+5V]. Operation Explanation (1) Concerning pin 13 reference voltage VST <1> Operation mode The SW transistor of bias circuit is turned on at VST ≥2.5V, and the amplifier becomes operation mode. ex) VST=2.5V VST=(*2) ×IST+0.6V→2.5V=4.7kΩ×IST+0.6V, IST≈0.40mA <2> Standby mode The SW transistor of Pre-driver IC is turned off at VST ≤0.6V (typ0V), and the amplifier becomes Stand-By Mode. ex) VST=0.6V VST=(*2) ×IST+0.6V→0.6V=4.7kΩ×IST+0.6V, IST≈0mA (*3) It can improve a pop noise at power up time by giving a time constant of the condenser during operation. (*4) Please decide a time constant to discharge the condenser during standby. Sink current IST Concerning pin 13 reference voltage VST Stand-by Control H: Operation Mode (+5V) L: Stand-by Mode (0V) 2.7k Ω(*1) 33 μF (*3) 33k Ω 2k Ω (*4) ΔVBE 1 2 3 4 7 6 5 8 9 10 11 12 STK433-300 series 13 14 Bias Circuit in PreDriver IC ΔVBE 15 4.7k Ω(*2) 16 17 18 19 ex) Stand-By control voltage=+5V VST=(5V-VBE ×2)×4.7kΩ/((*1)+4.7kΩ)+VBE =(5V-0.6V ×2)×4.7kΩ/(4.7kΩ+2.7kΩ)+0.6V ≈3.0(V) 1k Ω +VCC Ch2 OUT Ch1 OUT -VCC +PRE Ch1 IN Ch1 NF Ch2 IN Ch2 NF ST- BY Ch3 NF Ch3 IN Ch3 OUT SUB GND Ch2 OUT Ch1 OUT Ch3 OUT -PRE |
Số phần tương tự - STK433-320-E |
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Mô tả tương tự - STK433-320-E |
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