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ML4819 データシート(PDF) 5 Page - Micro Linear Corporation |
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ML4819 データシート(HTML) 5 Page - Micro Linear Corporation |
5 / 15 page ML4819 5 FUNCTIONAL DESCRIPTION OSCILLATOR The ML4819 oscillator charges the external capacitor (CT) with a current (ISET) equal to 5/RSET. When the capacitor voltage reaches the upper threshold, the comparator changes state and the capacitor discharges to the lower threshold through Q1. While the capacitor is discharging, the clock provides a high pulse. The oscillator period can be described by the following relationship: tOSC = tRAMP + tDEADTIME where: t= C(Ramp Valley to Peak) I RAMP SET and: t C(Ramp Valley to Peak) 8.4mA - I DEADTIME SET = The maximum duty cycle of the PWM section can be limited by setting a threshold on pin 7. when the CT ramp is above the threshold at pin 7, the PWM output is held off and the PWM flip-flop is set: D D (V - 0.9) 3.4 LIMIT OSC PIN7 ≅ × where: DLIMIT = Desired duty cycle limit DOSC = Oscillator duty cycle ELECTRICAL CHARACTERISTICS (Continued) PARAMETER CONDITIONS MIN TYP MAX UNITS UNDER-VOLTAGE LOCKOUT Start-Up Threshold 15 16 17 V Shut-Down Threshold 9 10 11 V VREF Good Threshold 4.4 V SUPPLY Supply Current Start-Up, VCC = 14V 0.6 1.2 mA Operating, TJ = 25×C25 35 mA Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions. Note 2: VCC is raised above the Start-Up Threshold first to activate the IC, then returned to 15V. Note 3: PWM comparator bias currents are subtracted from this reading. Figure 1. Oscillator Block Diagram RT ISET CT CLOCK DUTY CYCLE 20 10 ISET VREF 5V +5V TO PWM LATCH B TO PWM LATCHES 8.4mA Q1 CLOCK tD RAMP PEAK RAMP VALLEY CT 7 + – + – |
同様の部品番号 - ML4819 |
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同様の説明 - ML4819 |
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