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PDF NTE1753 Data sheet ( Hoja de datos )
| Número de pieza | NTE1753 | |
| Descripción | Integrated Circuit Pulse Width Modulator (PWM) Control Circuit | |
| Fabricantes | NTE | |
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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 pack-
age 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 con-
trol–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 out-
put 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 ex-
ternal bias circuits. The reference has an internal accuracy of ±5% with a typical thermal drift of less
than 50mV over an operating temperature range of 0 to +70°C.
Features:
D Complete Pulse Width Modulation Control Circuitry
D On–Chip Oscillator with Master or Slave Operation
D On–Chip Error Amplifiers
D On–Chip 5.0 Volt Reference
D Adjustable Dead Time Control
D Uncommitted Output Transistor for 200mA Source or Sink
1 page | ||
| Páginas | Total 4 Páginas | |
| PDF Descargar | [ Datasheet NTE1753.PDF ] | |
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