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TC429 датащи(PDF) 6 Page - Microchip Technology |
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TC429 датащи(HTML) 6 Page - Microchip Technology |
6 / 14 page TC429 DS21416B-page 6 2002 Microchip Technology Inc. FIGURE 3-3: SWITCHING TIME DEGRADATION DUE TO NEGATIVE FEEDBACK 3.3 Input Stage The input voltage level changes the no-load or quiescent supply current. The N-channel MOSFET input stage transistor drives a 3mA current source load. With a logic “1” input, the maximum quiescent supply current is 5mA. Logic “0” input level signals reduce quiescent current to 500 µA maximum. The TC429 input is designed to provide 300mV of hysteresis, providing clean transitions and minimizing output stage current spiking when changing states. Input voltage levels are approximately 1.5V, making the device TTL compatible over the 7V to 18V operating supply range. Input current is less than 10 µA over this range. The TC429 can be directly driven by TL494, SG1526/ 1527, SG1524, SE5560 or similar switch-mode power supply integrated circuits. By off-loading the power-driving duties to the TC429, the power supply controller can operate at lower dissipation, improving performance and reliability. FIGURE 3-4: PEAK OUTPUT CURRENT TEST CIRCUIT 3.4 Power Dissipation CMOS circuits usually permit the user to ignore power dissipation. Logic families such as the 4000 and 74C have outputs that can only supply a few milliamperes of current, and even shorting outputs to ground will not force enough current to destroy the device. The TC429, however, can source or sink several amperes and drive large capacitive loads at high frequency. The package power dissipation limit can easily be exceeded. Therefore, some attention should be given to power dissipation when driving low impedance loads and/or operating at high frequency. The supply current versus frequency and supply current versus capacitive load characteristic curves will aid in determining power dissipation calculations. Table 3-1 lists the maximum operating frequency for several power supply voltages when driving a 2500pF load. More accurate power dissipation figures can be obtained by summing the three power sources. Input signal duty cycle, power supply voltage and capacitive load influence package power dissipation. Given power dissipation and package thermal resis- tance, the maximum ambient operation temperature is easily calculated. The 8-pin CERDIP junction-to- ambient thermal resistance is 150 °C/W. At +25°C, the package is rated at 800mW maximum dissipation. Maximum allowable chip temperature is +150 °C. TC429 1 µF 0.1 µF 0.1 µF 0V 18V 2.4V 0V Logic Ground Power Ground 300 mV 6A PC Trace Resistance = 0.05W 2500pF 1 8 6,7 5 4 2 +18V TEK Current Probe 6302 TC429 1 µF 0.1 µF 0.1 µF 0V 18V 2.4V 0V 2500pF 1 8 6,7 5 4 2 TEK Current Probe 6302 +18V |
Аналогичный номер детали - TC429 |
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Аналогичное описание - TC429 |
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