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UC2901D Datenblatt(PDF) 4 Page - Texas Instruments |
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UC2901D Datenblatt(HTML) 4 Page - Texas Instruments |
4 / 7 page 4 UC1901 UC2901 UC3901 Figure 1. Transformer Coupled Open Loop Transfer Function µ µ Note: Transformer Data: N1 = N2 = 20TAWG 26 Core = Ferroxcube 3E2A Ferrite, 0.5" O.D. toroid Carrier Frequency = 1MHz Figure 2. Oscillator Frequency Figure 3. Typical Driver Output Swing vs Temperature The error amplifier compensation terminal, Pin 12, is in- tended as a source of feedback to the amplifier's invert- ing input at Pin 11. For most applications, a series DC blocking capacitor should be part of the feedback net- work. The amplifier is internally compensated for unity feedback. The waveform at the driver outputs is a squarewave with an amplitude that is proportional to the error amplifier in- put signal. There is a fixed 12dB of gain from the error amplifier compensation pin to the modulator driver out- puts. The frequency of the output waveform is controlled by either the internal oscillator or an external clock signal. With the internal oscillator the squarewave will have a fixed 50% duty cycle. If the internal oscillator is disabled by connecting Pin 1, CR,toVIN then the frequency and duty cycle of the output will be determined by the input clock waveform at Pin 2. If the oscillator remains disabled and there is not clock input at Pin 2, there will be a linear 12dB of signal gain to one or the other of the driver out- puts depending on the DC state of Pin 2. The driver outputs are emitter followers which will source a minimum of 15mA of current. The sink current, inter- nally limited at 700 µA, can be increased by adding resis- tors to ground at the driver outputs. APPLICATION INFORMATION |
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