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參數(shù)資料
| 型號： | NTE1753 |
| 廠商： | NTE Electronics, Inc. |
| 英文描述： | 2.5-V Integrated Reference Circuit 8-SOIC 0 to 70 |
| 中文描述： | 集成電路脈沖寬度調(diào)制（PWM）控制電路 |
| 文件頁數(shù)： | 1/4頁 |
| 文件大小： | 36K |
| 代理商： | NTE1753 |
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:
f
OSC
1.1
R
T
C
T
Output pulse width modulation is accomplished by comparison of the positive sawtooth waveform
across capacitor C
T
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 (V
CC
–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:
Complete Pulse Width Modulation Control Circuitry
On–Chip Oscillator with Master or Slave Operation
On–Chip Error Amplifiers
On–Chip 5.0 Volt Reference
Adjustable Dead Time Control
Uncommitted Output Transistor for 200mA Source or Sink
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|---|---|
| NTE1754 | 制造商:NTE Electronics 功能描述:INTEGRATED CIRCUIT VERTICAL DEFLECTION OUTPUT 9-LEAD SIP 制造商:NTE Electronics 功能描述:IC Package/Case:9-SIP 制造商:NTE Electronics 功能描述:IC-VERT DEFL CKT 制造商:NTE Electronics 功能描述:SIP-9 VERT DEFL OUT 制造商:NTE Electronics 功能描述:IC, VERTICAL DEFLECTION O/P CKT, SIP-9; IC Function:Vertical Deflection Output Circuit; Brief Features:Direct Drive to Deflection Coil, 90 & 110 Deflection System, Internal Blanking Guard Circuit; Supply Voltage Min:10V |
| NTE1754S | 制造商:NTE Electronics 功能描述:VERTICAL DEFLECTIONOUTPUT IC 9-PIN SIP |
| NTE1757 | 制造商:NTE Electronics 功能描述:IC-REMOTE CONTROL REC 制造商:NTE Electronics 功能描述:Remote Control Receiver 18-Pin PDIP |
| NTE1758 | 制造商:NTE 制造商全稱:NTE Electronics 功能描述:Integrated Circuit CMOS, 27 Command TV Remote Control Transmitter |
| NTE1759 | 制造商:NTE Electronics 功能描述:Command TV Remote Control Transmitter 16-Pin PDIP |
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