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LM3410XSD Datasheet(PDF) 10 Page - Texas Instruments |
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LM3410XSD Datasheet(HTML) 10 Page - Texas Instruments |
10 / 49 page VFB RSET = ILED ILED VFB RSET LM3410, LM3410Q SNVS541G – OCTOBER 2007 – REVISED MAY 2013 www.ti.com Design Guide SETTING THE LED CURRENT Figure 16. Setting ILED The LED current is set using the following equation: where • RSET is connected between the FB pin and GND. (1) DIM PIN / SHUTDOWN MODE The average LED current can be controlled using a PWM signal on the DIM pin. The duty cycle can be varied between 0 and 100% to either increase or decrease LED brightness. PWM frequencies in the range of 1 Hz to 25 kHz can be used. For controlling LED currents down to the µA levels, it is best to use a PWM signal frequency between 200 and 1 kHz. The maximum LED current would be achieved using a 100% duty cycle, i.e. the DIM pin always high. LED-DRIVE CAPABILITY When using the LM3410 in the typical application configuration, with LEDs stacked in series between the VOUT and FB pin, the maximum number of LEDs that can be placed in series is dependent on the maximum LED forward voltage (VFMAX). (VFMAX x NLEDs) + 190 mV < 24V (2) When inserting a value for maximum VFMAX the LED forward voltage variation over the operating temperature range should be considered. THERMAL SHUTDOWN Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature exceeds 165°C. After thermal shutdown occurs, the output switch doesn’t turn on until the junction temperature drops to approximately 150°C. INDUCTOR SELECTION The inductor value determines the input ripple current. Lower inductor values decrease the physical size of the inductor, but increase the input ripple current. An increase in the inductor value will decrease the input ripple current. 10 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM3410 LM3410Q |
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