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LM3552 Folha de dados(PDF) 11 Page - Texas Instruments

Nome de Peças LM3552
Descrição Electrónicos  1A White LED Driver with Flash Timeout Protection
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LM3552 Folha de dados(HTML) 11 Page - Texas Instruments

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LM3551, LM3552
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SNVS371D – AUGUST 2005 – REVISED MAY 2013
APPLICATION INFORMATION
LM3551 AND LM3552 FUNCTIONALITY TRUTH TABLE
SD (LM3551)
or
T/F
LM3551 Result
LM3552 Result
EN (LM3552)
1
0
Shut-down
Torch Mode
1
1
Shut-down
Flash Mode
0
0
Torch Mode
Shut-down
0
1
Flash Mode
Shut-down
The LM3551 has a 1.2M
Ω pull-up to VIN on SD and the LM3552 has a 1.2MΩ pull-down to GND on EN.
CURRENT SET EQUATIONS
The LM3551/2 utilize inline resistors to set the Torch and Flash LED currents. The Torch-Mode current
(continuous) and the Flash-Mode current (pulsed) are programmed by placing the appropriately selected
resistors between the feedback pin (FB) and FET-T (torch FET) and FET-F (flash FET) pins. Torch-mode is set
by utilizes the current through one resistor while Flash-mode is set by utilizes the currents though both current
set resistors. The following equations are used to set the LED currents.
RTORCH = (1.265V / ITORCH) - RDSON-T
(4)
RFLASH = (1.265V / (IFLASH- ITORCH)) - RDSON-F
(5)
RDSON-T= 0.98Ω and RDSON-F = 0.36Ω
(6)
NOTE
Flash LEDs from different manufacturers can have very different continuous and pulse
current ratings. See the manufacturers datasheets to ensure that the proper current levels
are used to avoid damaging the flash LED.
INDUCTOR SELECTION
Special care must be taken when selecting an inductor for use in LM3551/2 applications. The inductor should
have a current saturation rating that is larger than the worst case peak inductor current of the application to
ensure proper operation. Using an inductor with a lower saturation current rating than is required can cause a
dramatic drop in the inductance and can derate the maximum output current levels severely. It is worth noting
that the output voltage ripple is also affected by the total ripple current in the inductor. The following equations
can help give a good approximation as to what the peak inductor current will be for a given application at room
temperature (TA = +25°C).
IL(average) = [ILED × VOUT-MAX] ÷ [VIN-MIN × Eff.]
(7)
ΔIL = [VIN × D] ÷ [L × FSW]
(8)
IL(peak) = IL(ave) + [ΔIL ÷ 2]
(9)
VOUT-MAX Maximum Output Voltage. Maximum output voltage over temperature with OVP used is 11V (12.4V
typically).
VIN-MIN Minimum Input Voltage. Recommended minimum input voltage is 3.0V. The LM3551/2 will work down to
2.7V however, use at lower input voltages will required an inductor with a higher saturation current rating.
Eff.
Converter Efficiency (approx. 85% over input voltage range).
D
Duty Cycle = 1 - [VIN / VOUT]
L
Inductance. Recommended inductance value is 4.7µH.
FSW
Switching Frequency = 1.25MHz
Copyright © 2005–2013, Texas Instruments Incorporated
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