NTE1729 Integrated Circuit Pulse Width Modulator (PWM) Control Circuit Description: The NTE1729 is an inverter control unit in a 16–Lead DIP type package which provides all the control circuitry for PWM type switching regulators. Included in this device is the voltage reference, dual error amplifiers, oscillator, pulse width modulator, pulse steering flip flop, dual alternating output switches, and dead time control. Features: D Complete PWM Power Control Circuit D Adjustable Dead Time: 0 to 100% D No Double Pulsing of Same Output during Load Transient Condition D Dual Error Amplifiers have Wide Common Mode Input Voltage Capability: –0.3V to VCC –2V D Circuit Architecture Provides Easy Synchronization D Uncommitted Outputs for 250mA Sink or Source D With Miss–Operation Prevention Circuit for Low Level Supply Voltage Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41V Error Amplifier Input Voltage, VICM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC +0.3V Output Voltage, VCER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41V Total Power Dissipation (TA = +25°C), PT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +85°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Recommended Operating Conditions: Parameter Symbol Min Typ Max Unit Supply Voltage VCC 7 – 40 V Output Voltage VCER –0.3 – 40 V Output Current IC – – 200 mA IOAMP – – –0.3 mA Timing Capacitor CT 0.47 – 10000 nF Timing Resistance RT 1.8 – 500 kΩ Oscillation Frequency fosc 1 – 300 kHz Operating Temperature Topt –20 – +70 °C Error Amplifier Sink Current Electrical Characteristics: (VCC = +15V, f = 10kHz, –20° ≤ TA ≤ +70°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 4.75 5.0 5.25 V Reference Section Output Voltage Vref Iref = 1mA, TA = +25°C Line Regulation REGIN 7V ≤ VCC ≤ 40V, Iref = 1mA, TA = +25°C – 8 25 mV Load Regulation REGL 1mA ≤ Iref ≤ 10mA, TA = +25°C – 1 15 mV Temperature Coefficient Vref –20° ≤ TA ≤ +85°C, Iref = 1mA – 0.01 0.03 %/°C Short–Circuit Output Current Ishort Vref = 0, TA = +25°C, Note 2 – 50 – mA fOSC CT = 0.01µF, RT = 12kΩ, TA = +25°C – 10 – kHz Standard Deviation of Frequency 7V ≤ VCC ≤ 40V, CT, RT, Const., TA = +25°C, Note 1 – 10 – % Frequency Change with Temperature 0° ≤ TA ≤ +70°C, CT = 0.01µF, RT = 12kΩ – 1 2 % Frequency Change with Voltage 7V ≤ VCC ≤ 40V, CT = 0.01µF, RT = 12kΩ, TA = +25°C – – 1 % Input Bias Current 0 ≤ VI ≤ 5.25V – –2 –10 µA Maximum Duty Cycle (Each Output) VI = 0 45 49 – % Zero Duty Cycle – 3.0 3.3 V Maximum Duty Cycle 0 – – V Oscillator Section Frequency Dead–Time Control Section Input Threshold Voltage Vth Error Amplifier Section Input Offset Voltage VIO VOAMP = 2.5V – 2 10 mV Input Offset Current IIO VOAMP = 2.5V – 25 250 nA VOAMP = 2.5V – 0.2 1.0 mA –0.3 – – V VCC–2 – – V VOAMP = 0.5V to 3.5V, TA = +25°C 60 80 – dB TA = +25°C 500 830 – kHz VCC = 40V, TA = +25°C 65 80 – dB Output Sink Current VOAMP = 0.7V 0.3 0.7 – mA Output Source Current VOAMP = 3.5V –2 –10 – mA Input Threshold Voltage Zero Duty Cycle – 4.0 4.5 V Input Sink Current V(Pin3) = 0.7V 0.3 0.7 – mA VCE = 40V, VCC = 40V – 2 100 µA VCC = VC = 40V – – –100 µA VCE(sat) IC = 200mA, VE = 0, Common Emitter 0 0.95 1.3 V VCE(on) IE = 200mA, VC = 15V, Emitter Follower – 1.6 2.5 V Input Bias Current Common Mode Input Voltage Low VICM 7V ≤ VCC ≤ 40V High Open–Loop Voltage Amplification AV Unity Gain Bandwidth Common Mode Rejection Ratio CMRR PWM Section Output Section Collector Cutoff Current ICER Emitter Cutoff Current Collector Saturation Voltage Electrical Characteristics (Cont’d): (VCC = +15V, f = 10kHz, –20° ≤ TA ≤ +70°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit – 100 200 ns – 100 200 ns – 70 200 ns – 70 200 ns Output Section (Cont’d) Output Voltage Rise Time Common Emitter tr VCC = 15V, RL = 150Ω, IO = 100mA, TA = +25°C Emitter Follower Output Voltage Fall Time Common Emitter tf Emitter Follower Total Device Standby Current ICC(S.B.) VCC = 15V, all other inputs and outputs open – 8.0 12.5 mA Bias Current ICC(B.I.) V(Pin4) = 2V – 10 – mA Note 1. Standard deviation is a measure of the statistical distribution about the mean as derived from the formula: α= N 2 S (Xn – X) n=1 N–1 Calculation expression of frequency is as follows: 1 fOSC = (Hz) [RT] = Ω, [CT] = F 0.817 RT D CT + 1.42 D 10–6 Note 2. Maximum duration of short–circuit condition is 1sec (non–repetitive). Pin Connection Diagram Non–Inverting Input 1 Inverting Input 2 Feedback 3 Dead–Time Control 4 16 Non–Inverting Input 15 Inverting Input 14 Reference Output 13 Output Control CT 5 12 VCC RT 6 11 Collector 2 GND 7 10 Emitter 2 Collector 1 8 9 Emitter 1 16 9 .260 (6.6) Max 1 8 .785 (19.9) Max .300 (7.62) .200 5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7)