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LM3421 Datasheet(PDF) 1 Page - Texas Instruments |
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LM3421 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 72 page  OVP nDIM LM3421 AGND VIN PGND DDRV DAP GATE EN COMP VIN CSH RCT IS HSP RPD VCC HSN 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ILED PWM Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design LM3421, LM3421-Q1, LM3423, LM3423-Q1 SNVS574F – JULY 2008 – REVISED JULY 2015 LM342x/-Q1 N-Channel Controllers for Constant-Current LED Drivers 1 Features 3 Description The LM3421 and LM3423 family of devices are 1 • LM3421Q1/LM3423Q1 are Automotive Grade versatile high voltage N-channel MOSFET controllers Products That are AEC-Q100 Grade 1 Qualified for LED drivers. They can be easily configured in • LM3421Q0/LM3423Q0 are Automotive Grade buck, boost, buck-boost and SEPIC topologies. This Products That are AEC-Q100 Grade 0 Qualified flexibility, along with an input voltage rating of 75 V, makes the LM3421 and LM3423 devices ideal for • VIN Range From 4.5 V to 75 V illuminating LEDs in a large family of applications. • High-Side Adjustable Current Sense Adjustable high-side current sense voltage allows for • 2- Ω, 1-A Peak MOSFET Gate Driver tight regulation of the LED current with the highest • Input Undervoltage and Output Overvoltage efficiency possible. The LM3421 and LM3423 devices Protection use predictive off-time (PRO) control, which is a • PWM and Analog Dimming combination of peak current-mode control and a predictive off-timer. This method of control eases the • Cycle-by-Cycle Current Limit design of loop compensation while providing inherent • Programmable Switching Frequency input voltage feed-forward compensation. • Zero Current Shutdown and Thermal Shutdown The LM3421 and LM3423 devices include a high- • LED Output Status Flag (LM3423/23Q1/23Q0 voltage start-up regulator that operates over a wide Only) input range of 4.5 V to 75 V. The internal PWM • Fault Status Flag and Timer (LM3423/23Q1/23Q0 controller is designed for adjustable switching Only) frequencies of up to 2 MHz, thus enabling compact solutions. 2 Applications Device Information(1) • LED Drivers: Buck, Boost, Buck-Boost, and PART NUMBER PACKAGE BODY SIZE (NOM) SEPIC LM3421 • Indoor and Outdoor Area SSL HTSSOP (16) 5.00 mm × 4.40 mm LM3421-Q1 • Automotive LM3423 HTSSOP (20) 6.50 mm × 4.40 mm • General Illumination LM3423-Q1 • Constant-Current Regulators (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Boost Application Circuit 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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