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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LM3450 Fiches technique(PDF) 3 Page - National Semiconductor (TI) |
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LM3450 Fiches technique(HTML) 3 Page - National Semiconductor (TI) |
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3 / 28 page  Pin Descriptions Pin Name Description Application Information 1 V REF 3V Reference Reference Output: Connect directly to V ADJ or to resistor divider feeding VADJ and to necessary external circuits. 2 V ADJ Analog Adjust Analog Dim and Phase Dimming Range Input: Connect directly to V REF to force standard 70% phase dimming range. Connect to resistor divider from V REF to extend usable range of some phase dimmers or for analog dimming. Connect to GND for low power mode. 3 FLT2 Filter 2 Ramp Comparator Input: Connect a series resistor from FLT1 capacitor and a capacitor to GND to establish second filter pole. 4 FLT1 Filter 1 Angle Decoder Output: Connect a series resistor to a capacitor to GND to establish first filter pole. 5 DIM 500 Hz PWM Output Open Drain PWM Dim Output: Connect to dimming input of output stage LED driver (directly or with isolation) to provide decoded dimming command. 6 V AC Sampled Rectified Line Multiplier and Angle Decoder Input: Connect to resistor divider from rectified AC line. 7 COMP Compensation Error Amplifier Output and PWM Comparator Input: Connect a capacitor to GND to set the compensation. 8 FB Feedback Error Amplifier Inverting Input: Connect to output voltage via resistor divider to control PFC voltage loop for non-isolated designs. Connect a 5.11k Ω resistor to GND for isolated designs (bypasses error amplifier). Also includes over-voltage protection and shutdown modes. 9 I SEN Input Current Sense Input Current Sense Non-Inverting Input: Connect to diode bridge return and resistor to GND to sense input current for dynamic hold. Connect a 0.1µF capacitor and Schottky diode to GND, and a 0.22µF capacitor to HOLD. 10 GND Power Ground System Ground 11 CS Current Sense MosFET Current Sense Input: Connect to positive terminal of sense resistor in PFC MosFET source. 12 GATE Gate Drive Gate Drive Output: Connect to gate of main power MosFET for PFC. 13 V CC Input Supply Power Supply Input: Connect to primary bias supply. Connect a 0.1µF bypass capacitor to ground. 14 ZCD Zero Crossing Detector Demagnetization Sense Input: Connect a 100k Ω resistor to transformer/inductor winding to detect when all energy has been transferred. 15 HOLD Dynamic Hold Open Drain Dynamic Hold Input: Connect to holding resistor which is connected to source of passFET. 16 BIAS Pre-regulator Gate Bias Pre-regulator Gate Bias Output: Connect to gate of passFET and through resistor to rectified AC (drain of passFET) to aid with startup. 3 www.national.com |
Numéro de pièce similaire - LM3450 |
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Description similaire - LM3450 |
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