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ML4835 Datasheet(PDF) 7 Page - Micro Linear Corporation |
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ML4835 Datasheet(HTML) 7 Page - Micro Linear Corporation |
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7 / 17 page  ML4835 7 Figure 3. ML4835 PFC Controller Section FUNCTIONAL DESCRIPTION (Continued) The ML4835 implements a triple frequency operation scheme: programmable three-frequency sequence for pre- heat, ignition, and dimming, that extends lamp life, simplifies lamp network design, and starts lamps at any dimming level without flashing. This addresses the need for a high-Q network for starting sequence and low-Q network for operation, minimizing parasitic losses and improving overall power efficiency. The values for the pre-heat, start, operation, and restart can be programmed or selected (Figure 2). POWER FACTOR SECTION The ML4835 power factor section is a peak or average current sensing boost mode PFC control circuit in which only voltage loop compensation is needed. It is simpler than a conventional average current control method. It consists of a voltage error amplifier, a current sense amplifier (no compensation is needed), an integrator, a comparator, and a logic control block. In the boost topology, power factor correction is achieved by sensing the output voltage and the current flowing through the current sense resistor. Duty cycle control is achieved by comparing the integrated voltage signal of the error amplifier and the voltage across RSENSE. The duty cycle control timing is shown in Figure 3. + – – + LAMP NETWORK INVERTER LAMP LAMP RA SW2 L SW1 RSENSE RB VOUT EMI FILTER 18 3 PIFB PIFBO CRAMP C1 C2 R1 CRAMP PFC OUT PVFB/OVP 1 –A S VREF1 OSC PIFBO RAMP CLK PFC OUT CLK RQ V TO I PEAO 13 PEAO 2 4 START HIGH Q LOW Q OPERATION PREHEAT f3 f2 f1 ML4835 SET TIME VALUES FOR PREHEAT, START AND OPERATION, AND RESTART Figure 2. Three Frequency Design Model |
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