NTE1729

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 Supply Voltage Output Voltage Output Current Error Amplifier Sink Current Timing Capacitor Timing Resistance Oscillation Frequency Operating Temperature Symbol VCC VCER IC IOAMP CT RT fosc Topt Min 7 –0.3 – – 0.47 1.8 1 –20 Typ – – – – – – – – Max 40 40 200 –0.3 10000 500 300 +70 Unit V V mA mA nF kΩ kHz °C Electrical Characteristics: (VCC = +15V, f = 10kHz, –20° ≤ TA ≤ +70°C, unless otherwise specified) Parameter Reference Section Output Voltage Line Regulation Load Regulation Temperature Coefficient Short–Circuit Output Current Oscillator Section Frequency Standard Deviation of Frequency Frequency Change with Temperature Frequency Change with Voltage Dead–Time Control Section Input Bias Current Maximum Duty Cycle (Each Output) Input Threshold Voltage Vth 0 ≤ VI ≤ 5.25V VI = 0 Zero Duty Cycle Maximum Duty Cycle Error Amplifier Section Input Offset Voltage Input Offset Current Input Bias Current Common Mode Input Voltage Low High AV CMRR VOAMP = 0.5V to 3.5V, TA = +25°C TA = +25°C VCC = 40V, TA = +25°C VOAMP = 0.7V VOAMP = 3.5V Zero Duty Cycle V(Pin3) = 0.7V ICER VCE(sat) VCE(on) VCE = 40V, VCC = 40V VCC = VC = 40V IC = 200mA, VE = 0, Common Emitter IE = 200mA, VC = 15V, Emitter Follower VICM VIO IIO VOAMP = 2.5V VOAMP = 2.5V VOAMP = 2.5V 7V ≤ VCC ≤ 40V – – – –0.3 VCC–2 60 500 65 0.3 –2 2 25 0.2 – – 80 830 80 0.7 –10 10 250 1.0 – – – – – – – mV nA mA V V dB kHz dB mA mA – 45 – 0 –2 49 3.0 – –10 – 3.3 – µA % V V fOSC CT = 0.01µF, RT = 12kΩ, TA = +25°C 7V ≤ VCC ≤ 40V, CT, RT, Const., TA = +25°C, Note 1 0° ≤ TA ≤ +70°C, CT = 0.01µF, RT = 12kΩ 7V ≤ VCC ≤ 40V, CT = 0.01µF, RT = 12kΩ, TA = +25°C – – – – 10 10 1 – – – 2 1 kHz % % % Vref REGIN REGL Vref Ishort Iref = 1mA, TA = +25°C 7V ≤ VCC ≤ 40V, Iref = 1mA, TA = +25°C 1mA ≤ Iref ≤ 10mA, TA = +25°C –20° ≤ TA ≤ +85°C, Iref = 1mA Vref = 0, TA = +25°C, Note 2 4.75 – – – – 5.0 8 1 0.01 50 5.25 25 15 0.03 – V mV mV %/°C mA Symbol Test Conditions Min Typ Max Unit Open–Loop Voltage Amplification Unity Gain Bandwidth Common Mode Rejection Ratio Output Sink Current Output Source Current PWM Section Input Threshold Voltage Input Sink Current Output Section Collector Cutoff Current Emitter Cutoff Current Collector Saturation Voltage – 0.3 4.0 0.7 4.5 – V mA µA µA V V – – 0 – 2 – 0.95 1.6 100 –100 1.3 2.5 Electrical Characteristics (Cont’d): (VCC = +15V, f = 10kHz, –20° ≤ TA ≤ +70°C, unless otherwise specified) Parameter Output Section (Cont’d) Output Voltage Rise Time Common Emitter Emitter Follower Output Voltage Fall Time Common Emitter Emitter Follower Total Device Standby Current Bias Current ICC(S.B.) ICC(B.I.) VCC = 15V, all other inputs and outputs open V(Pin4) = 2V – – 8.0 10 12.5 – mA mA tf tr VCC = 15V, RL = 150Ω, IO = 100mA, TA = +25°C – – – – 100 100 70 70 200 200 200 200 ns ns ns ns Symbol Test Conditions Min Typ Max Unit Note 1. Standard deviation is a measure of the statistical distribution about the mean as derived from the formula: N 2 S (Xn – X) n=1 N–1 α= 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 CT 5 RT 6 GND 7 Collector 1 8 16 Non–Inverting Input 15 Inverting Input 14 Reference Output 13 Output Control 12 VCC 11 Collector 2 10 Emitter 2 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)