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| Datasheet File OCR Text: |
| NTE7117 Integrated Circuit Switched-Mode Power Supply Controller Description: The NTE7117 is a control circuit in an 8-Lead DIP type package designed for use in switched-mode power supplies. It contains an internal temperature-compensated supply, PWM, sawtooth oscillator, over-current sense latch, and output stage. This device is intended for low cost SMPS applications where extensive housekeeping functions are not required. Features: D Pulse Width Modulator D Current Limiting (Cycle-by-Cycle) D Sawtooth Generator D Stabilized Power Supply D Double-Pulse Protection D Internal Temperature-Compensated Reference Applications: D Switch-Mode Power Supplies D DC Motor Controller Inverter D DC/DC Converter Absolute Maximum Ratings: Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Output Current, IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mA Output Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98% Maximum Total Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mW Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C DC Electrical Characteristics: (VCC = 12V, TA = +25C unless otherwise specified) Parameter Reference Section Internal Reference Voltage Internal Zener Reference Temperature Coefficient of VREF Temperature Coefficient of VZ Oscillator Section Frequency Range Initial Accuracy Duty Cycle Range f TA = 0 to +70C RT and CT Constant fo = 20kHz 50 - 0 - 5 - 100k - 98 Hz % % VREF VZ TA = +25C TA = 0 to +70C IL = 7mA 3.69 3.66 7.8 - - 3.75 - 8.2 100 100 3.84 3.87 8.8 - - V V V ppm/C ppm/C Symbol Test Conditions Min Typ Max Unit DC Electrical Characteristics (Cont'd): (VCC = 12V, TA = +25C unless otherwise specified) Parameter Current Limiting Input Current Single Pulse Inhibit Delay Current Limit Trip Level Error Amplifier Open-Loop Gain Feedback Resistor Small-Signal Bandwidth Output Voltage Swing, High Output Voltage Swing, Low Output Stage Output Current Saturation Voltage Supply Voltage/Current Supply Current Supply Voltage Low Supply Protection Pin1 Threshold 8.0 9.0 10.5 V ICC VCC IZ = 0, Voltage-Fed TA = +25C TA = 0 to +70C - - 19 20 - - 21 - 10 13 24 30 mA mA V V IOUT VCE TA = 0 to +70C TA = 0 to +70C IC = 20mA IC = 40mA 20 - - - - - - 0.4 0.5 mA V V BW VOH VOL - 10k - 6.2 - 60 - 3 - - - - - - 0.7 dB MHz V V IIN Pin6 = 250mV TA = +25C TA = 0 to +70C Inhibit Delay Time IOUT = 20mA for 20% Overdrive IOUT = 40mA - - - - 0.4 -2 - 0.88 0.7 0.5 -10 -20 1.10 0.8 0.6 A A s s V Symbol Test Conditions Min Typ Max Unit IS = 10mA, Current-Fed ICC = 30mA, Current-Fed 8 5 .256 (6.52) Max Pin Connection Diagram 1 4 VCC 1 VZ 2 Feedback 3 Gain 4 8 GND 7 Output 6 Current Sense 5 RT, CT .393 (10.0) Max .150 (3.81) .300 (7.62) .100 (2.54) .300 (7.62) .070 (1.77) Min |
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