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LM3554 Scheda tecnica(PDF) 11 Page - Texas Instruments

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Il numero della parte LM3554
Spiegazioni elettronici  Synchronous Boost Converter with 1.2A Dual High Side LED Drivers and I2C Compatible
PDF  43 Pages
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM3554 Scheda tecnica(HTML) 11 Page - Texas Instruments

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LM3554
www.ti.com
SNVS549A – JUNE 2009 – REVISED APRIL 2011
Typical Performance Characteristics (continued)
VIN = 3.6V, LEDs are Lumiled PWF-4, COUT = 10µF, CIN = 4.7µF, L = FDSE0312-2R2 (2.2µH, RL = 0.15Ω), TA = +25°C unless
otherwise specified.
Closed Loop Current Limit
Closed Loop Current Limit
vs
vs
VIN
VIN
(Flash Duration Register bits [6:5] = 10, (2))
(Flash Duration Register bits [6:5] = 11, (2))
VIN Monitor Thresholds
OVP Thresholds
vs
vs
Temperature
VIN
(3)
Indicator Current
Short Circuit Current Limit
vs
vs
VIN, VLEDI = 2V
VIN
(Torch Brightness Register bits[7:6] = 00)
(3)
The typical curve for Current Limit is measured in closed loop using the typical application circuit by increasing IOUT until the peak
inductor current stops increasing. The value given in the Electrical Table is measured open loop and is found by forcing current into SW
until the current limit comparator threshold is reached. Closed loop data appears higher due to the delay between the comparator trip
point and the NFET turning off. This delay allows the closed loop inductor current to ramp higher after the trip point by approximately
20ns × VIN/L
Copyright © 2009–2011, Texas Instruments Incorporated
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