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NTE1720 Dataheets PDF



Part Number NTE1720
Manufacturers NTE
Logo NTE
Description Integrated Circuit Pulse Width Modulator (PWM) Regulator
Datasheet NTE1720 DatasheetNTE1720 Datasheet (PDF)

NTE1720 Integrated Circuit Pulse Width Modulator (PWM) Regulator Description: The NTE1720 PWM switching regulator control circuit contains all the essential circuitry to implement single–ended or push–pull switching regulators. Included on the circuit are oscillator, voltage reference, a pulse width modulator, error amplifier, overload protection circuitry and output drivers. A substance zener reference has been used to provide excellent stability with time and the reference has been used to pro.

  NTE1720   NTE1720


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NTE1720 Integrated Circuit Pulse Width Modulator (PWM) Regulator Description: The NTE1720 PWM switching regulator control circuit contains all the essential circuitry to implement single–ended or push–pull switching regulators. Included on the circuit are oscillator, voltage reference, a pulse width modulator, error amplifier, overload protection circuitry and output drivers. A substance zener reference has been used to provide excellent stability with time and the reference has been used to provide excellent stability with time and the reference is trimmed at the wafer level to provide an initial accuracy of 2%. Additionally, the oscillator is trimmed to provide a medium tolerance of 6%. Features: D Reference Tolerance: ±2% D Oscillator Tolerance: ±6% D Long Term Stability: 10mV/1000 Hrs D Operates Above 100kHz Applications: D Switching Power Supplies D Motor Speed Control D Off–Line Power Converters Absolute Maximum Ratings: Input Voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Reference Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA Output Current (Each Output) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA Oscillator Charging Current (Pin6 or Pin7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Internal Power Dissipation (Note 1), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C Lead Temperature (During soldering, 10 sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C Note 1. For operating at elevated temperatures, the NTE1720 is derated at 150°C/W to a maximum junction temperature of 115°C. Electrical Characteristics: (TA = +25°C, VIN = 20V, f = 20kHz unless otherwise specified) Parameter Reference Section Output Voltage Line Regulation Load Regulation Ripple Rejection Short Circuit Current Limit Temperature Stability Long Term Stability Oscillator Section Maximum Frequency Initial Accuracy Voltage Stability Temperature Stability Output Amplitude Output Pulse Width Error Amplifier Section Input Offset Voltage Input Bias Current Open Loop Voltage Gain Common–Mode Voltage Common–Mode Rejection Ratio Small Signal Bandwidth Output Voltage Comparator Section Minimum Duty Cycle Maximum Duty Cycle Input Threshold Input Bias Current Current Limiting Section Sense Voltage Sense Voltage T.C. Common–Mode Voltage Output Section (Each Output) Collector–Emitter Voltage Collector Leakage Current Saturation Voltage Emitter Output Voltage Rise Time Fall Time Total Standby Current VCE = 40V IC = 50mA VIN = 20V RC = 2kΩ RC = 2kΩ VIN = 40V, Note 2 40 – – 17 – – – – 0.1 1 16 0.2 0.1 8 – 50 2 – – – 10 V µA V V µs µs mA Pin 9 = 2V with Error Amplifier Set for Max Out 180 – –1 200 0.2 – 220 – 1 mV mV/°C V Zero Duty Cycle – 45 – – – 40 1 1 0 – – – % % V µA AV = 0dB VCM = 2.5V VCM = 2.5V – – 72 1.8 – – 0.5 0.5 2 80 – 70 3 – 5 10 – 3.4 – – 3.8 mV µA dB V dB MHz V Pin3 CT = 0.01µF, TA = 25°C CT = 0.001pF, RT = 2kΩ RT and CT Constant VIN = 8V to 40V – – – – – – 300 6 – 2 3.5 0.5 – – 1 – – – kHz % % % µs µs VIN = 8V to 40V IL = 0mA to 20 t = 120Hz VREF = 0 4.8 – – – – – – 5.8 10 20 66 100 0.3 20 5.2 20 50 – – 1 – V mV mV dB mA % mV/kHz Test Conditions Min Typ Max Unit Note 2. Standby current does not include the oscillator charging current, error and current limit dividers, and the outputs are open circuit. APPLICATIONS INFORMATION: (Functional Description and Pin Functions) Voltage Regulator The Internal 5V regulator (Input Pin15, output Pin16) supplies a regulated 5V to all Internal circuitry, as well as up to 50mA for external circuitry. For operation below 8V externally applied. Oscillator The Internal oscillator circuitry sets the frequency of operation for the switching regulator. The oscillator waveform is a ramp from about 1V to 3.5V (Pin7). Frequency is set by a timing resistor from Pin6 to ground and a capacitor from Pin7 to GND. The oscillator period is approximately RC for the recommended range of 1.8K to 100K for R and 0.001µF to 0.1µF for C. The fall time of the ramp sets the blanking or dead time where both outputs are off in push–pull regulators. This is controlled by the value of the capacitor alone. Output Transistors The two output transistors have both the emitters (Pin11 and Pin14) and the collectors available (Pin12 and Pin13). Internal current limiting for both of these transistors is about 100mA. The two transistors are driven 180° out of phase by the flip–flop. For single–ende.


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