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LM3406 Scheda tecnica(PDF) 8 Page - Texas Instruments

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Il numero della parte LM3406
Spiegazioni elettronici  1.5A Constant Current Buck Regulator for Driving High Power LEDs
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Produttore elettronici  TI1 [Texas Instruments]
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LM3406/06HV
CS
VSNS
IF
RSNS
IF
+
-
One-shot
VO
VF
VF
LED 1
LED n
0.2V
+
-
COMP
tON = 1 x 10
-11 x R
ON x
VO
VIN
LM3406, LM3406HV
SNVS512C – SEPTEMBER 2008 – REVISED FEBRUARY 2010
www.ti.com
APPLICATION INFORMATION
THEORY OF OPERATION
The LM3406 and LM3406HV are buck regulators with a wide input voltage range, low voltage reference, and a
fast output enable/disable function. These features combine to make them ideal for use as a constant current
source for LEDs with forward currents as high as 1.5A. The controlled on-time (COT) architecture uses a
comparator and a one-shot on-timer that varies inversely with input and output voltage instead of a fixed clock.
The LM3406/06HV also employs an integrator circuit that averages the output current. When the converter runs
in continuous conduction mode (CCM) the controlled on-time maintains a constant switching frequency over
changes in both input and output voltage. These features combine to give the LM3406/06HV an accurate output
current, fast transient response, and constant switching frequency over a wide range of conditions.
CONTROLLED ON-TIME OVERVIEW
Figure 12 shows a simplified version of the feedback system used to control the current through an array of
LEDs. A differential voltage signal, VSNS, is created as the LED current flows through the current setting resistor,
RSNS. VSNS is fed back by the CS pin, where it is integrated and compared against an error amplifier-generated
reference. The error amplifier is a transconductance (Gm) amplifier which adjusts the voltage on COMP to
maintain a 200 mV average at the CS pin. The on-comparator turns on the power MOSFET when VSNS falls
below the reference created by the Gm amp. The power MOSFET conducts for a controlled on-time, tON, set by
an external resistor, RON, the input voltage, VIN and the output voltage, VO. On-time can be estimated by the
following simplified equation (for the most accurate version of this expression see the Appendix):
(1)
At the conclusion of tON the power MOSFET turns off and must remain off for a minimum of 230 ns. Once this
tOFF-MIN is complete the CS comparator compares the integrated VSNS and reference again, waiting to begin the
next cycle.
Figure 12. Comparator and One-Shot
8
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Product Folder Links: LM3406 LM3406HV


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