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LM3433 データシート(PDF) 9 Page - Texas Instruments

部品番号 LM3433
部品情報  Common Anode Capable High Brightness LED Driver with High Frequency Dimming
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ホームページ  http://www.ti.com
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0.3V < VADJ < (The greater of 1.5V or (VIN - 1.9V))
VSENSE = (VADJ - VCGND)/16.66
RSENSE = 60mV/ILED
ILED = VSENSE/RSENSE
LM3433
www.ti.com
SNVS535B – OCTOBER 2007 – REVISED MARCH 2008
The LED current is set by the voltage across a sense resistor. This sense voltage is nominally 60mV but can be
programmed higher or lower by an external control voltage.
The running frequency of the converter is programmed by an external RC network in conjunction with the LED's
forward voltage. The frequency is nominally set around 200kHz to 500khz. Fast PWM control is available by
shorting the output of the current source by a MOSFET in parallel with the LED. During the LED OFF time the
running frequency is determined by the RC network and the parasitic resistance of the output circuit including the
DIM FET RDSON.
The LM3433 system has been evaluated to be a very accurate, high compliance current source. This is manifest
in its high output impedance and accurate current control. The current is measured to vary less than 6mA out of
6A when transitioning from LED OFF (output shorted) to LED ON (output ~6V).
PROTECTION
The LM3433 has dedicated protection circuitry running during normal operation. The thermal shutdown circuitry
turns off all power devices when the die temperature reaches excessive levels. The VCC undervoltage lockout
(UVLO) comparator protects the power devices during power supply startup and shutdown to prevent operation
at voltages less than the minimum operating input voltage. The VCC pin is short circuit protected to VEE. The
LM3433 also features a shutdown mode which decreases the supply current to approximately 35µA.
The ADJ, EN, and DIM pins are capable of sustaining up to +/-2mA. If the voltages on these pins will exceed
either VIN or CGND by necessity or by a potential fault, an external resistor is recommended for protection. Size
this resistor to limit pin current to under 2mA. A 10k resistor should be sufficient. This resistor may be used in
any application for added protection without any impact on function or performance.
DESIGN PROCEDURE
This section presents guidelines for selecting external components.
SETTING LED CURRENT CONTROL
LM3433 uses average current mode control to regulate the current delivered to the LED (ILED). An external
current sense resistor (RSENSE) in series with the LED is used to convert ILED into a voltage that is sensed by the
LM3433 at the CSP and CSN pins. CSP and CSN are the inputs to an error amplifier with a programmed input
offset voltage (VSENSE). VSENSE is used to regulate ILED based on the following equation:
(1)
FIXED LED CURRENT
The ADJ pin sets VSENSE. Tie ADJ to VIN to use a fixed 60mV internal reference for VSENSE. Select RSENSE to fix
the LED current based on the following equation:
(2)
ADJUSTABLE LED CURRENT
When tied to an external voltage the ADJ pin sets VSENSE based on the following equation:
(3)
When the reference on ADJ is adjustable, VSENSE and ILED can be adjusted within the linear range of the ADJ pin.
This range has the following limitations:
(4)
When VADJ is less than this linear range the VSENSE is guaranteed by design to be less than or equal to
0.3V/16.667. When VADJ is greater than this linear range and less than VIN - 1V, VSENSE is guaranteed by design
to be less than or equal to VADJ/16.667. If VADJ is greater than VIN - 1V, VSENSE switches to 60mV.
Copyright © 2007–2008, Texas Instruments Incorporated
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