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NTE1753

NTE
Part Number NTE1753
Manufacturer NTE
Description Integrated Circuit Pulse Width Modulator (PWM) Controller
Published May 9, 2005
Detailed Description NTE1753 Integrated Circuit Pulse Width Modulator (PWM) Control Circuit Description: The NTE1753 is a fixed–frequency pul...
Datasheet PDF File NTE1753 PDF File

NTE1753
NTE1753


Overview
NTE1753 Integrated Circuit Pulse Width Modulator (PWM) Control Circuit Description: The NTE1753 is a fixed–frequency pulse width modulation control circuit in a 14–Lead DIP type package incorporating the primary building blocks required for the control of a switching power supply.
An internal–linear sawtooth oscillator frequency is determined by: 1.
1 fOSC ^ RT D CT Output pulse width modulation is accomplished by comparison of the positive sawtooth waveform across capacitor CT to either of two control signals.
The output is enabled only during that portion of time when the sawtooth voltage is greater than the control signals.
Therefore, an increase in control–signal amplitude causes a corresponding linear decrease of output pulse width.
The control signals are external inputs that can be fed into the dead–time control, the error amplifier inputs, or the feed–back input.
The dead–time control comparator has an effective 120mV input offset which limits the minimum output dead time to approximately the first 4% of the sawtooth–cycle time.
This would result in a maximum duty cycle of 96%.
Additional dead time may be imposed on the output by setting the dead time–control input to a fixed voltage, ranging between 0 to 3.
3V.
The pulse width modulator comparator provides a means for the error amplifiers to adjust the output pulse width from the maximum percent on–time, established by the dead time control input, down to zero, as the voltage at the feedback pin varies from 0.
5 to 3.
5V.
Both error amplifiers have a common– mode input range from –0.
3V to (VCC –2V), and may be used to sense power supply output voltage and current.
The error–amplifier outputs are active high and are 0 red together at the non–inverting input of the pulse–width modulator comparator.
With this configuration, the amplifier that demands minimum output on time, dominates control of the loop.
The NTE1753 has an internal 5.
0V reference capable of sourcing up to 10mA of load currents for external bias ci...


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