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ML4832CP Datasheet(PDF) 8 Page - Micro Linear Corporation |
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ML4832CP Datasheet(HTML) 8 Page - Micro Linear Corporation |
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8 / 15 page  ML4832 8 The magnitude of the offset voltage that will appear at the input is given by VOS = io/gm. For an io of 1mA and a gm of 0.05 µmhos the input referred offset will be 20mV. Capacitor C1 as shown in Figure 2 is used to block the DC current to minimize the adverse effect of offsets. Slew rate enhancement is incorporated into all of the operational transconductance amplifiers in the ML4832. This improves the recovery of the circuit in response to power up and transient conditions. The response to large signals will be somewhat non-linear as the transconductance amplifiers change from their low to high transconductance mode. This is illustrated in Figure 4. BALLAST OUTPUT SECTION The IC controls output power to the lamps via frequency modulation with non-overlapping conduction. This means that both ballast output drivers will be low during the discharging time tDIS of the oscillator capacitor CT. OSCILLATOR The VCO frequency ranges are controlled by the output of the LFB amplifier. As lamp current decreases, LFB OUT rises in voltage, causing the CT charging current to decrease, thereby causing the oscillator frequency to decrease. Since the ballast output network attenuates high frequencies, the power to the lamp will be increased. The oscillator frequency is determined by the following equations: F tt OSC CHG DIS = + 1 (3) and tR C In VI R V VI R V CHG T T REF CH T TL REF CH T TH = +− +− (4) The oscillator’s minimum frequency is set when ICH = 0 where: F RC OSC TT ≅ × 1 051 . (5) This assumes that tCHG >> tDIS. When LFB OUT is high, ICH = 0 and the minimum frequency occurs. The charging current varies according to two control inputs to the oscillator: 1. The output of the preheat timer 2. The voltage at LFB OUT In preheat condition, charging current is fixed at I R CHG PREHEAT SET () . = 25 (6) 17 + – 1.25/3.75 8 CT VREF ICHG VREF CONTROL RT/CT RT 5.5mA CLOCK CT VTH = 3.75V VTL = 1.25V tDIS tCHG Figure 5. Oscillator Block Diagram and Timing FUNCTIONAL DESCRIPTION (Continued) |
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