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