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LM3842A Datasheet(PDF) 4 Page - HTC Korea TAEJIN Technology Co. |
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LM3842A Datasheet(HTML) 4 Page - HTC Korea TAEJIN Technology Co. |
4 / 7 page CURRENT MODE PWM CONTROLLER LM3842A/3A/4A/5A Fig.4 Current Sense Circuit Peak current (IS) is determined by the formula: IS(MAX) A small RC filter may be required to suppress switch transients. Fig.5 Oscillator Waveforms and Maximum Duty Cycle Oscillator timing capacitor, CT, is charged by VREF through RT, and discharged by an internal current source. During the discharge time, the internal clock signal blanks the output to the low state. Selection of RT and CT therefore determines both oscillator frequency and maximum duty cycle. Charge and discharge times are determined by the formulas: tc 0.55 RT CT td RT CT ∫n( ) Frequency, then, is: f = (tc + td) -1 For RT>5KΩ, f HTC 4 1 3 5 IS ERROR AMP 2R R 1V CURRENT SENSE COMPARATOR COMP CURRENT SENSE GND C RS R ~ ~ 1.0V RS ~ ~ 0.0063 RT - 2.7 0.0063 RT - 4 ~ ~ 1.8 RT CT ~ ~ 8 4 5 VREF RT/CT GND LARGE RT SMALL CT V4 INTERNAL CLOCK LARGE RT SMALL CT V4 INTERNAL CLOCK RT CT |
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