NTE7096 & NTE7097 Integrated Circuit Current Mode Pulse Width Modulator (PWM) Control Circuit Description: The NTE7096 and NTE7097 are integrated circuits in 8–Lead DIP type packages that incorporate a new precision temperature–controlled oscillator with an internally trimmed discharge current to minimize variations in frequency. A precision duty–cycle clamp eliminates any need for an external oscillator when at, or near, a 50% duty–cycle condition. Duty–cycles greater than 50% are also possible. Special logic ensures that Vref is stabilized before the output stage is enabled. Ion–implant resistors provide tighter control of under–voltage lockout. Other features include low start–up current, pulse–by–current limiting, and high–current totem pole output for driving capacitive loads, such as the gate of a power MOSFET. The output is low in the off state, consistent with N–channel devices. Features: D Optimized for Off–Line Control D Internally Trimmed Temperature Compensated Oscillator D Maximum Duty–Cycle Clamp D Vref Stabilized before Output Stage is Enabled D Low Start–Up Current D Pulse–by Pulse Current Limiting D Improved U/V Lockout D Double Pulse Suppression D 1% Trimmed Bandgap Reference D High Current Totem Pole Output Absolute Maximum Ratings: Supply Voltage (ICC < 30mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Self Limiting Supply Voltage (Low Impedence Source) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1A Output Energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5µJ Analog Inputs (Pin2, Pin3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to VCC Error Amp Output Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Elecrtrical Characteristics: (0° ≤ TA ≤ +70°C, VCC = 15V, Rt = 680Ω, Ct = .022µF, Note 1 unless otherwise specified) Parameter Test Conditions Min Typ Max Unit 4.9 5.0 5.1 V Reference Section Output Voltage TJ = +25°C, IO = 1mA Line Regulation 12V ≤ VIN ≤ 25V – 6 20 mV Load Regulation 1mA ≤ IO ≤ 20mA – 6 25 mV Temperature Stability Note 2 Total Output Variation Line, Load, Temperature, Note 2 Output Noise Voltage 10Hz ≤ f ≤ 10kHz, TJ = +25°C, Note 2 Long Term Stability TA = +125°C, 1000Hrs., Note 2 – Output Short Circuit TA = +25°C –30 Initial Accuracy TJ = +25°C 47 Voltage Stability 12V ≤ VCC ≤ 25V – Temperature Stability 0° ≤ TA ≤ +70°C, Note 2 Amplitude VPIN4 peak to peak Discharge Current – 0.2 0.4 mV/°C 4.82 – 5.18 V – 50 – µV 5 25 mV –100 –180 mA 52 57 kHz 0.2 1.0 % – 5 – % – 1.7 – V TJ = +25°C 7.8 8.3 8.8 mA 0° ≤ TA ≤ +70°C 7.6 – 9.0 mA VPIN1 = 2.5V 2.42 2.50 2.58 V – –0.3 –2.0 µA Oscillator Section Error Amp Section Input Voltage Input Bias Current AVOL 2V ≤ VO ≤ 4V 65 90 – dB Unity Gain Bandwidth Note 2 0.7 1.0 – MHz PSRR 12V ≤ VCC ≤ 25V 60 70 – dB Output Sink Current VPIN2 = 2.7V, VPIN1 = 1.1V 2 6 – mA Output Source Current VPIN2 = 2.3V, VPIN1 = 5V –0.5 –0.8 – mA VOUT High VPIN2 = 2.3V, RL = 15K to GND 5 6 – V VOUT Low VPIN2 = 2.7V, RL = 15K to Pin8 – 0.7 1.1 V Current Sense Section Gain Note 3, Note 4 2.85 3.00 3.15 V/V Maximum Input Signal VPIN1 = 5V, Note 3 0.9 1.0 1.1 V PSRR 12V ≤ VCC ≤ 25V, Note 3 – 70 – dB – –2 –10 µA TJ = +25°C, Note 2 – 150 300 ns ISINK = 20mA – 0.1 0.4 V Input Bias Current Delay to Output Output Section Output Low Level ISINK = 200mA Output High Level – 1.5 2.2 V ISOURCE = 20mA 13.0 13.5 – V ISOURCE = 200mA 12.0 13.5 – V Rise Time TJ = +25°C,CL = 1nF, Note 2 – 50 150 ns Fall Time TJ = +25°C,CL = 1nF, Note 2 – 50 150 ns Output Leakage VCC = 14V, UVLO Active, VPIN6 = 0 – –0.01 –10 µA – 0.5 1.0 mA Total Standby Current Start–Up Current Operating Supply Current VPIN2 = VPIN3 = 0V, RT = 10K, CT = 3.3nF – 11 17 mA VCC Zener Voltage ICC = 25mA – 34 – V Parameter Test Conditions Min Typ Max Unit 14.5 16.0 17.5 V 7.8 8.4 9.0 V 8.5 10.0 11.5 V 7.0 7.9 8.2 V Under–Voltage Lockout Section Start Threshold NTE7096 NTE7097 Minimum Operating Voltage NTE7096 After Turn On NTE7097 Note Note Note Note 1. 2. 3. 4. Adjust VCC above the start threshold before setting at 15V. These parameters, although guaranteed, are not 100% tested in production. Parameter measured at trip point of latch with VPIN2 = 0. Gain defined as: ∆VPIN1 ; 0 ≤ VPIN3 ≤ 0.8V A= ∆VPIN3 Pin Connection Diagram COMP 1 8 VREF VFB 2 7 VCC ISENSE 3 6 OUTPUT RTCT 4 5 GND 8 5 .260 (6.6) 1 4 .390 (9.9) Max .300 (7.62) .155 (3.93) .100 (2.54) .145 (3.68) .300 (7.62)