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UC2901-EP Fiches technique(PDF) 5 Page - Texas Instruments |
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UC2901-EP Fiches technique(HTML) 5 Page - Texas Instruments |
5 / 10 page Primary Powerand Switches Power Transformer ToSupply Monitor ToPWM Controller RFCoupling Transformer STATUS DRIVERB DRIVERA UC2901 EXTCLK CT Oscillator X4 10% -/+ +/- E/A 1.5V Reference RT V IN - + V IN COMP INV NI VREF GND Supply Output UC2901-EP www.ti.com SLUS709A – DECEMBER 2006 – REVISED MARCH 2010 APPLICATION INFORMATION The error amplifier compensation terminal, pin 12, is intended as a source of feedback to the amplifier's inverting input at pin 11. For most applications, a series DC blocking capacitor should be part of the feedback network. The amplifier is compensated internally for unity feedback. The waveform at the driver outputs is a squarewave, with an amplitude that is proportional to the error amplifier input signal. There is a fixed 12 dB of gain from the error amplifier compensation pin to the modulator driver outputs. The frequency of the output waveform is controlled by either the internal oscillator or an external clock signal. With the internal oscillator, the squarewave has a fixed 50% duty cycle. If the internal oscillator is disabled by connecting pin 1, CR, to VIN, then the frequency and duty cycle of the output is 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 12-dB signal gain to one or the other of the driver outputs, depending on the DC state of pin 2. The driver outputs are emitter followers that source a minimum of 15 mA of current. The sink current, internally limited at 700 mA, can be increased by adding resistors to ground at the driver outputs. Figure 4. Transformer-Coupled Feedback Copyright © 2006–2010, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): UC2901-EP |
Numéro de pièce similaire - UC2901-EP_15 |
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Description similaire - UC2901-EP_15 |
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