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NTE1720 Datasheet Preview

NTE1720 Datasheet

Integrated Circuit Pulse Width Modulator (PWM) Regulator

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NTE1720 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 refer-
ence, 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 toler-
ance 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.



NTE
NTE

NTE1720 Datasheet Preview

NTE1720 Datasheet

Integrated Circuit Pulse Width Modulator (PWM) Regulator

No Preview Available !

NTE1720 pdf
Electrical Characteristics: (TA = +25°C, VIN = 20V, f = 20kHz unless otherwise specified)
Parameter
Test Conditions
Min Typ Max Unit
Reference Section
Output Voltage
4.8 5.8 5.2
V
Line Regulation
Load Regulation
Ripple Rejection
VIN = 8V to 40V
IL = 0mA to 20
t = 120Hz
10 20
20 50
66
mV
mV
dB
Short Circuit Current Limit
Temperature Stability
VREF = 0
100
0.3 1
mA
%
Long Term Stability
20 mV/kHz
Oscillator Section
Maximum Frequency
Initial Accuracy
Voltage Stability
Temperature Stability
CT = 0.001pF, RT = 2k
RT and CT Constant
VIN = 8V to 40V
300
6
––1
2
kHz
%
%
%
Output Amplitude
Pin3
3.5
µs
Output Pulse Width
Error Amplifier Section
CT = 0.01µF, TA = 25°C
0.5
µs
Input Offset Voltage
Input Bias Current
Open Loop Voltage Gain
VCM = 2.5V
VCM = 2.5V
0.5 5
2 10
72 80
mV
µA
dB
CommonMode Voltage
1.8 3.4
V
CommonMode Rejection Ratio
70
dB
Small Signal Bandwidth
Output Voltage
AV = 0dB
3 MHz
0.5 3.8
V
Comparator Section
Minimum Duty Cycle
––0
%
Maximum Duty Cycle
45 40
%
Input Threshold
Zero Duty Cycle
1
V
Input Bias Current
1
µA
Current Limiting Section
Sense Voltage
Pin 9 = 2V with Error Amplifier Set for Max Out 180 200 220 mV
Sense Voltage T.C.
0.2 mV/°C
CommonMode Voltage
1 1
V
Output Section (Each Output)
CollectorEmitter Voltage
40 – –
V
Collector Leakage Current
Saturation Voltage
Emitter Output Voltage
Rise Time
Fall Time
Total Standby Current
VCE = 40V
IC = 50mA
VIN = 20V
RC = 2k
RC = 2k
VIN = 40V, Note 2
0.1 50
12
17 16
0.2
0.1
8 10
µA
V
V
µs
µs
mA
Note 2. Standby current does not include the oscillator charging current, error and current limit divid-
ers, and the outputs are open circuit.


Part Number NTE1720
Description Integrated Circuit Pulse Width Modulator (PWM) Regulator
Maker NTE
Total Page 4 Pages
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