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LM3405AXMKX Datasheet(PDF) 8 Page - Texas Instruments

Part # LM3405AXMKX
Description  LM3405A 1.6MHz, 1A Constant Current Buck LED Driver with Internal ensation in Tiny SOT and VSSOP PowerPAD Packages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3405AXMKX Datasheet(HTML) 8 Page - Texas Instruments

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0
0
VIN
-VD1
TON
t
t
Inductor
Current
D = TON/TSW
VSW
TOFF
TSW
IL
SW
Voltage
'iL
IF
ILPK
LM3405A
SNVS508C – OCTOBER 2007 – REVISED MAY 2013
www.ti.com
APPLICATION INFORMATION
THEORY OF OPERATION
The LM3405A is a PWM, current-mode controled buck switching regulator designed to provide a simple, high
efficiency solution for driving LEDs with a preset switching frequency of 1.6MHz. This high frequency allows the
LM3405A to operate with small surface mount capacitors and inductors, resulting in LED drivers that need only a
minimum amount of board space. The LM3405A is internally compensated, simple to use, and requires few
external components.
The following description of operation of the LM3405A will refer to the Simplified Block Diagram (Figure 13) and
to the waveforms in Figure 14. The LM3405A supplies a regulated output current by switching the internal NMOS
power switch at constant frequency and variable duty cycle. A switching cycle begins at the falling edge of the
reset pulse generated by the internal oscillator. When this pulse goes low, the output control logic turns on the
internal NMOS power switch. During this on-time, the SW pin voltage (VSW) swings up to approximately VIN, and
the inductor current (IL) increases with a linear slope. IL is measured by the current sense amplifier, which
generates an output proportional to the switch current. The sense signal is summed with the regulator’s
corrective ramp and compared to the error amplifier’s output, which is proportional to the difference between the
feedback voltage and VREF. When the PWM comparator output goes high, the internal power switch turns off until
the next switching cycle begins. During the switch off-time, inductor current discharges through the catch diode
D1, which forces the SW pin to swing below ground by the forward voltage (VD1) of the catch diode. The
regulator loop adjusts the duty cycle (D) to maintain a constant output current (IF) through the LED, by forcing FB
pin voltage to be equal to VREF (0.205V).
Figure 14. SW Pin Voltage and Inductor Current Waveforms of LM3405A
8
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Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: LM3405A


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