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ML4812IQ Scheda tecnica(PDF) 5 Page - Fairchild Semiconductor |
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ML4812IQ Scheda tecnica(HTML) 5 Page - Fairchild Semiconductor |
5 / 16 page ML4812 REV. 1.0 10/10/2000 5 FUNCTIONAL DESCRIPTION OSCILLATOR The ML4812 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, Q2 provides a high pulse. The Oscillator period can be described by the following relationship: Figure 2. Oscillator Timing Resistance vs. Frequency Figure 1. Oscillator Block Diagram Figure 3. Output Saturation Voltage vs. Output Current 10 SYNC Q2 Q1 9 RT 16 CT EXTERNAL CLOCK + - 5.6V ISET 8.4mA CT RT ISET CSYNC RSYNC CLOCK tD RAMP VALLEY RAMP PEAK V(CT) 10 OSCILLATOR FREQUENCY (kHz) 10 100 1000 8 5 3 2 1 10nF 20nF 5nF 2nF 1nF 85% 80% 70% 90% 15 14 13 3 2 1 0 OUTPUT CURRENT (mA) 0 200 400 800 600 VCC VCC = 15V 80µs PULSED LOAD 120Hz RATE GND SOURCE SATURATION LOAD TO GROUND SINK SATURATION LOAD TO VCC TT T OSC RAMP DEADTIME =+ where: V V D OUT IN ON = - 1 and: T CV mA I DEADTIME T RAMP VALLEY TO PEAK SET = ´ - 84 . |
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