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UC2872N Fiches technique(PDF) 1 Page - Texas Instruments |
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UC2872N Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 11 page UC1872 UC2872 UC3872 07/99 FEATURES • Controls Different Types of Lamps: Cold Cathode Fluorescent, Neon, and Gas Discharge • Zero Voltage Switching (ZVS) of Push-Pull Drivers • Accurate Control of Lamp Current • Variable Lamp Intensity Control • 1µA Disable Current • 4.5V to 24V Operation • Open Lamp Detection Circuitry DESCRIPTION The UC3872 is a resonant lamp ballast controller optimized for driving cold cathode fluorescent, neon, and other gas discharge lamps. The res- onant power stage develops a sinusoidal lamp drive voltage, and mini- mizes switching loss and EMI generation. Lamp intensity adjustment is accomplished with a buck regulator, which is synchronized to the external power stage’s resonant frequency. Suitable for automotive and battery powered applications, the UC3872 draws only 1 µA when disabled. Soft start and open lamp detect circuitry have been incorporated to mini- mize component stresses. Open lamp detection is enabled at the comple- tion of a soft start cycle. The chip is optimized for smooth duty cycle control to 100%. Other features include a precision 1.2% reference, undervoltage lockout, and accurate minimum and maximum frequency control. Resonant Lamp Ballast Controller 4 6 5 3 2 12 13 1 14 7 8 + – 0.5V SYNC OUT SENSE OSCILLATOR GND + – – OPEN LAMP DETECT + – + – UVLO 3.0V REF 10 9 11 R S T TOGGLE 50k 50k 50k PUSH PULL OUTPUTS N-CHANNEL VC AOUT BOUT COUT PGND 0.1V PWM 1 0.2V 200 µA ZERO DETECT ZD CT SS INV COMP ENBL REF VCC 1.5V 20 µA (HIGH=ENABLE) BUCK DRIVE P-CHANNEL EA BLOCK DIAGRAM UDG-99112 Note: Pin numbers shown are for DIP package. application INFO available |
Numéro de pièce similaire - UC2872N |
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Description similaire - UC2872N |
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