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NTE1722 Datasheet Preview

NTE1722 Datasheet

Integrated Circuit Pulse Width Modulator (PWM) Control Circuit

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NTE1722 pdf
NTE1722
Integrated Circuit
Pulse Width Modulator (PWM) Control Circuit
Description:
The NTE1722 is a high performance pulse width modulator integrated circuit in an 18–Lead DIP type
package intended for fixed frequency switching regulators and other power control applications.
Functions included in this IC are a temperature compensated voltage reference, sawtooth oscillator,
error amplifier, pulse width modulator, pulse metering and steering logic, and two high current totem
pole outputs ideally suited for driving the capacitance of power FETs at high speeds.
Additional protective features include soft start and undervoltage lockout, digital current limiting,
double pulse inhibit, adjustable dead time and a data latch for single pulse metering. All digital control
ports art TTL and B–series CMOS compatible. Active low logic design allows easy wired–OR connec-
tions for maximum flexibility. The versatility of this device enables implementation in single–ended
or push–pull switching regulators that are transformerless or transformer coupled.
Features:
D 8.0 to 35 Volt Operation
D 5.0 Volt ±1% Trimmed Reference
D 1.0Hz to 400kHz Oscillator Range
D Dual Source/Sink Current Outputs: ±100mA
D Digital Current Limiting
D Programmable Dead Time
D Wide Current Limit Common Mode Range
D Guaranteed 6 Unit Synchronization
Absolute Maximum Ratings: (Values beyond which damage may occur)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V
Collector Supply Voltage, VC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to +5.5V
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to VCC V
Output Current (Source or Sink), IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200mA
Reference Load Current (VCC = 40V, Note 1), Iref . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Logic Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA
Power Dissipation (TA = +25°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW
Derate Above 50°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mW/°C
Power Dissipation (TC = +25°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3000mW
Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24mW/°C
Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 150°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Thermal Resistance, Junction–to–Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100°C/W
Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±300°C
Note 1. Maximum junction temperature must be observed.



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NTE1722 Datasheet Preview

NTE1722 Datasheet

Integrated Circuit Pulse Width Modulator (PWM) Control Circuit

No Preview Available !

NTE1722 pdf
Recommended Operating Conditions:
Parameter
Symbol
Supply Voltage
VCC
Collector Supply Voltage
VC
Output Sink/Source Current (Each Output)
IO
Reference Load Current
Oscillator Frequency Range
Oscillator Timing Resistor
Iref
Iref
RT
Oscillator Timing Capacitor
CT
Available Deadtime Range (40kHz)
Operating Junction Temperature Range
TJ
Test Conditions
Min Typ Max Unit
+8.0 +35 V
+4.5 +35 V
0 ±100 mA
0 20 mA
0 20 mA
2.0 150 k
0.001 20 µF
3.0 50 %
0 +125 °C
Electrical Characteristics: (VCC = 15V, TJ = 0° to +125°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Referencd Section (IL = 0mA unless otherwise specified)
Reference Output Voltage
Vref TJ = +25°C
Line Regulation
Regline +8.0V VCC +35V
Load Regulation
Regload 0mA IL 20mA
Temperature Stability
Vref/TJ
Total Reference Output Voltage Variation
Vref
+8.0V VCC +35V,
0mA IL 20mA
Short Circuit Current
ISC Vref = 0V, Note 1
Uundervoltage Lockout
4.90 5.00 5.10 V
10 30 mV
10 50 mV
10
mV
4.85 5.00 5.15 V
25 80 125 mA
Reset Output Voltage
Oscillator Section (Note 2)
Vref = +3.8V
Vref = +4.8V
0.2 0.4
2.4 4.8
V
V
Initial Accuracy
TJ = +25°C
Frequency Stability over Power
Supply Range
fosc +8.0V VCC +35V
VCC
Frequency Stability over Temperature
fosc
TJ
TJ = 0° to +125°C
Minimum Frequency
fmin RT = 150k, CT = 20µF
Maximum Frequency
fmax RT = 2k, CT = 0.001µF
Sawtooth Peak Voltage
Vosc(p) VCC = +35V
Sawtooth Valley Voltage
Vosc(v) VCC = +8V
Error Amplifier Section (0V VCM +5.2V unless otherwise specified)
Input Offset Voltage
VIO RS 2k
Input Bias Current
IIB
Input Offset Current
IIO
DC Open Loop Gain
AVOL RL 10M
±3.0 ±8.0 %
0.5 1.0 %
2.0 %
0.5
400
3.0
0.45 0.8
Hz
kHz
3.5 V
V
20 10 mV
– –350 2000 nA
35 200 nA
60 72
dB
Note 1. Maximum junction temperature must be observed.
Note 2. fOSC = 40kHz (RT = 4.12kΩ ± 1%, CT = 0.01µF ± 1%, RD = 0)


Part Number NTE1722
Description Integrated Circuit Pulse Width Modulator (PWM) Control Circuit
Maker NTE
Total Page 4 Pages
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