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ML4835CS Datasheet(PDF) 6 Page - Micro Linear Corporation |
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ML4835CS Datasheet(HTML) 6 Page - Micro Linear Corporation |
6 / 17 page ML4835 6 FUNCTIONAL DESCRIPTION The ML4835 consists of peak or average current controlled continuous boost power factor front end section with a flexible ballast control section. Start-up and lamp- out retry timing are controlled by the selection of external timing components, allowing for control of a wide variety of different lamp types. The ballast section controls the lamp power using frequency modulation (FM) with additional programmability provided to adjust the VCO frequency range. This allows for the IC to be used with a variety of different output networks. Figure 1 depicts a detailed block diagram of ML4835. The ML4835 provides several safety features. See the corresponding sections for more details: • End-of-lamp life detection to detect EOL and shut-off lamps; See End Of Life Section. • Thermal shutdown for temperature sensing extremes; See IC Bias, Under-Voltage Lockout and Thermal Shutdown Section. • Relamping starting with anti-flash for programmable restart for lamp out conditions while minimizing “flashing” when powering from full power to dimming levels; See Starting, Re-Start, Preheat and Interrupt Section Figure 1. Detailed Block Diagram VCC 19 REF 20 AGND 14 CRAMP 13 PVFB/OVP 1 PEAO 2 PIFB PIFBO 4 PFC OUT 18 RSET 7 LAMP FB 5 LEAO 6 RT2 8 INTERRUPT 10 PWDET 12 PGND 15 OUT B 16 OUT A 17 REF – + 14V + – 6.75V Q Q R S Q Q T + – TEMP 130ºC/100ºC + – 1.25V/1V RX/CX 6.75V/1.25V 2.5V + – 1.0V Q Q S R – + – + + – 4.75V/ 1.75V + – PVFB 2.75V + – –1V + – 3 R S Q Q R S Q Q – + 2.5V V TO I ÷2 CLK1 CLK RX/CX 11 PFC CONTROLLER OVP ILIM UVLO REF_OK PREHEAT THERMAL SHUTDOWN RT/CT 9 OSCILLATOR V TO I V TO I COMP |
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