Datenblatt-Suchmaschine für elektronische Bauteile |
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LM494CN Datenblatt(PDF) 4 Page - National Semiconductor (TI) |
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LM494CN Datenblatt(HTML) 4 Page - National Semiconductor (TI) |
4 / 8 page Functional Description The basic oscillator (switching) frequency is controlled by an external resistor (RT) and capacitor (CT) The relationship between the values of RT CT and frequency is shown in Figure 10 The level of the sawtooth wave form is compared with an error voltage by the pulse width modulated comparator The output of the PWM Comparator directs the pulse steering flip-flop and the output control logic The error voltage is generated by the error amplifier The error amplifier boosts the voltage difference between the output and the 50V internal reference See Figure 7 for error amp sensing techniques The second error amp is typi- cally used to implement current-limiting The output control logic selects either push-pull or single- ended operation of the output transistors (see Figure 6 ) The dead time control prevents on-state overlap of the out- put transistors as can be seen in Figure 5 The dead time is approximately 30% or 50% of the total period if the dead time control is grounded This dead time can be increased by connecting the dead time control to a voltage up to 50V The frequency response of the error amps (Figure 11) can be modified by using external resistors and capacitors These components are typically connected between the compensation terminal and the inverting input of the error amps The switching frequency of two or more LM494 circuits can be synchronized The timing capacitor CT is connected as shown in Figure 8 Charging current is provided by the mas- ter circuit Discharging is through all the circuits slaved to the master RT is required only for the master circuit Test Circuits TLH10056 – 3 FIGURE 1 Error Amplifier Test Circuit TLH10056 – 4 FIGURE 2 Current Limit Sense Amplifier Test Circuit TLH10056 – 5 TLH10056 – 6 FIGURE 3 Common Emitter Configuration Test Circuit and Waveform TLH10056 – 7 TLH10056 – 8 FIGURE 4 Emitter Follower Configuration Test Circuit and Waveform TLH10056 – 9 FIGURE 5 Dead Time and Feedback Control Test Circuit 4 |
Ähnliche Teilenummer - LM494CN |
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Ähnliche Beschreibung - LM494CN |
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