LM3464MH National Semiconductor, LM3464MH Datasheet
LM3464MH
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LM3464MH Summary of contents
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... Protection features include VIN under-voltage lock-out, LED open/short circuit and over-temperature fault signaling to the system controller. Typical Application © 2011 National Semiconductor Corporation LM3464/LM3464A Features ■ Wide input voltage range 12V-80V (LM3464) 12V– ...
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... Connection Diagram Ordering Information Order Number LM3464MH Exposed Pad TSSOP-28 LM3464MHX LM3464AMH Exposed Pad TSSOP-28 LM3464AMHX www.national.com Package Type NSC Package Drawing MXA28A MXA28A 2 30115002 Supplied As 73 Units per Anti-Static Tube 2500 Units on Tape and Reel 73 Units per Anti-Static Tube 2500 Units on Tape and Reel ...
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Pin Descriptions Pin Name Description 1 SYNC Synchronization signal output for cascade operation (Master-Slave configuration) 2 DIM PWM dimming control 3 Thermal Thermal sensor input 4 Thermal_Cap Thermal dimming ramp capacitor 5 VDHC Head room control 6 DMIN Minimum thermal ...
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Pin Name Description 20 SE4 Channel 4 sense input 21 GD4 Channel 4 gate driver output 22 PGND Power Ground 23 GD3 Channel 3 gate driver output 24 SE3 Channel 3 sense input 25 GD2 Channel 2 gate driver output ...
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... Absolute Maximum Ratings (LM3464/LM3464A) (Note If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (LM3464/LM3464A GND IN DR1, DR2, DR3, DR4 to GND EN to GND All other inputs to GND ESD Rating (Note 2) Human Body Model Electrical Characteristics (LM3464/LM3464A) +25° ...
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Symbol Parameter LED Current Regulator V GDx gate driver max. output voltage GDx-MAX V GDx gate driver min. output voltage GDx-MIN I GDx gate driver short circuit current GDx-MAX I DRx pin input current DRx Fault Detection and Handling V ...
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Typical Performance Characteristics application for driving twelve power LEDs with four output channels active and output current per channel = 350 mA. T unless otherwise specified. Channel 1 Current Sense Voltage (V Thermal_Cap Pin Output Current Operating Current (EN pin ...
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Startup Waveforms PWM Dimming Delay Time (V ) rising) DIM Thermal Foldback Dimming (V ) rising) THERMAL www.national.com PWM Dimming (DIM pin) 30115023 PWM Dimming Delay Time 30115025 Thermal Foldback Dimming 30115027 8 30115024 (V ) falling) DIM 30115044 (V ...
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Block Diagram 9 30115021 www.national.com ...
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www.national.com 10 ...
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Overview The LM3464/64A is a four channel linear current regulator designed for LED lighting systems with wide input voltage range, high speed PWM and thermal foldback dimming con- trol interface. The LM3464/64A incorporates a Dynamic Headroom Control (DHC) technology which ...
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Application Information SETTING (V ) RAIL(nom) The nominal rail voltage V is the nominal output volt- RAIL(nom) age of the primary power supply (AC/DC) prior to DHC begins. The selection primarily depend on the forward RAIL(nom) voltages ...
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Thus the voltage headroom follows this equation: where 0.8V < V < 2V VDHC SETTING LED CURRENT The LED current regulating mechanism of the LM3464/64A driver stage contains four ...
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LM3464/64A driver stage slow enough for initial trial. The value of the C capacitor can be reduced to speed up DHC the response of the LM3464/64A driver stage. ...
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FIGURE 10. Thermal Foldback Control with Minimum Dimming Duty Cycle Limit To define the minimum thermal dimming duty cycle, V should be set in between 0.4V to 3.25V. The minimum duty cycle is governed by the following equation ...
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FAULT_CAP pin and GND Normally FLT delay time is suitable for most application. For those applica- tions with slow response primary power supply, the value of C ...
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FIGURE 13. Additional Voltage Clamping Circuits for V APPLICATIONS WITH HIGH RAIL VOLTAGE The normal operation voltage of the LM3464 and LM3464A are rated to 80V and 95V respectively, applying voltage over the operation voltage limit to the LM3464/64A can ...
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CMHZ5267B is specified 1.7mA at 75V zener voltage. The maximum allowable reverse current is 6.67mA as the power rating of the CMHZ5276B is 500mW. Given that the input current of the DRx pins of the LM3464/64A ...
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Additional Application Circuit 19 www.national.com ...
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Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 28-Lead eTSSOP Package NS Package Number MXA28A 20 ...
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Notes 21 www.national.com ...
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