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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 connections 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 = +25C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW Derate Above 50C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mW/C Power Dissipation (TC = +25C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3000mW Derate Above 25C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24mW/C Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 150C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Thermal Resistance, Junction-to-Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100C/W Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300C Note 1. Maximum junction temperature must be observed.
Recommended Operating Conditions:
Parameter Supply Voltage Collector Supply Voltage Output Sink/Source Current (Each Output) Reference Load Current Oscillator Frequency Range Oscillator Timing Resistor Oscillator Timing Capacitor Available Deadtime Range (40kHz) Operating Junction Temperature Range Symbol VCC VC IO Iref Iref RT CT - TJ Test Conditions Min +8.0 +4.5 0 0 0 2.0 0.001 3.0 0 Typ - - - - - - - - - Max +35 +35 100 20 20 150 20 50 +125 Unit V V mA mA mA k F % C
Electrical Characteristics: (VCC = 15V, TJ = 0 to +125C unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit Referencd Section (IL = 0mA unless otherwise specified) Reference Output Voltage Line Regulation Load Regulation Temperature Stability Total Reference Output Voltage Variation Short Circuit Current Uundervoltage Lockout Reset Output Voltage - Vref = +3.8V Vref = +4.8V Oscillator Section (Note 2) Initial Accuracy Frequency Stability over Power Supply Range Frequency Stability over Temperature Minimum Frequency Maximum Frequency Sawtooth Peak Voltage Sawtooth Valley Voltage - fosc VCC fosc TJ fmin fmax Vosc(p) Vosc(v) VIO IIB IIO AVOL RL 10M TJ = +25C +8.0V VCC +35V TJ = 0 to +125C RT = 150k, CT = 20F RT = 2k, CT = 0.001F VCC = +35V VCC = +8V RS 2k - - - - 400 - 0.45 3.0 0.5 2.0 0.5 - 3.0 0.8 8.0 1.0 - - - 3.5 - % % % Hz kHz V V - 2.4 0.2 4.8 0.4 - V V Vref Regline Regload Vref/TJ Vref ISC +8.0V VCC +35V, 0mA IL 20mA Vref = 0V, Note 1 TJ = +25C +8.0V VCC +35V 0mA IL 20mA 4.90 - - - 4.85 25 5.00 10 10 10 5.00 80 5.10 30 50 - 5.15 125 V mV mV mV V mA
Error Amplifier Section (0V VCM +5.2V unless otherwise specified) Input Offset Voltage Input Bias Current Input Offset Current DC Open Loop Gain - - - 60 20 -350 35 72 10 -2000 200 - mV nA nA dB
Note 1. Maximum junction temperature must be observed. Note 2. fOSC = 40kHz (RT = 4.12k 1%, CT = 0.01F 1%, RD = 0)
Electrical Characteristics (Cont'd): (VCC = 15V, TJ = 0 to +125C unless otherwise specified)
Parameter Symbol Test Conditions VPin1 - VPin2 +150mV, ISource = 100A VPin2 - VPin1 +150mV, ISink = 100A RS 2k +12V VCC +18V Vcompensation = +0.4V Vcompensation = +3.6V Isource = 40A Isink = 3.6mA VIH = +2.4V VIL = +0.4V RS 50 Min Typ Max Unit Error Amplifier Section (Cont'd) (0V VCM +5.2V unless otherwise specified) High Output Voltage Low Output Voltage Common Mode Rejection Ratio Power Supply Rejection Ratio PWM Comparator Section (Note 2) Minimum Duty Cycle Maximum Duty Cycle DCmin DCmax VOH VOL IIH IIL Vsense IIB Reset = +0.4V ICS VOH VOL IC(Leak) tr tf ICC Shutdown + +0.4V, VCC = +35V, RT = 4.12k Reset = +2.4V - 45 - 49 0 - % % VOH VOL CMRR PSRR 3.6 - 70 66 4.2 0.2 94 80 - 0.4 - - V V dB dB
Digital Ports (SYNC, SHUTDOWN, RESET) Output Voltage, High Logic Level Output Voltage, Low Logic Level Input Current, High Logic Level Input Current, Low Logic Level 2.4 - - - 4.0 0.2 -125 -225 - 0.4 -200 -360 V V A A mV A V A V V V V A s s mA
Current Limit Comparator Section (0V VCM +12V unless otherwise specified) Sense Voltage Input Bias Current Soft-Start Section Error Clamp Voltage CSoft-Start Charging Current Output High Level - 50 0.1 100 0.4 150 80 - 100 -3 120 -10
Output Drivers (Each Output, VC = +15Vdc unless otherwise specified) Isource = 20mA Isource = 100mA Output Low Level ISink = 20mA ISink = 100mA Collector Leakage Rise Time Fall Time Supply Current VC = +40V CL = 1000pF 12.5 12.0 - - - - - - 13.5 13.0 0.2 1.2 50 0.3 0.1 18 - - 0.3 2.0 150 0.6 0.2 30
Note 2. fOSC = 40kHz (RT = 4.12k 1%, CT = 0.01F 1%, RD = 0)
Pin Connection Diagram
Error (+) 1 Error (-) 2 Compensation 3 CSOFT-START 4 Reset 5 Current Sense (-) 6 Current Sense (+) 7 Shutdown 8 RT 9
18 Vref 17 VCC 16 Output B 15 GND 14 VC 13 Output A 12 Sync 11 RD 10 CT
18
10
1
9
.870 (22.1) Max
.250 (6.35)
.150 (3.8)
.100 (2.54) .800 (20.3)
.125 (3.17) Min

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