9
LM3554
www.ti.com
SNVS549C –JUNE 2009–REVISED FEBRUARY 2016
Product Folder Links: LM3554
Submit Documentation FeedbackCopyright © 2009–2016, Texas Instruments Incorporated
Typical Characteristics (continued)
V
IN
= 3.6 V, LEDs are Lumiled PWF-4, C
OUT
= 10 µF, C
IN
= 4.7 µF, L = FDSE0312-2R2 (2.2 µH, R
L
= 0.15 Ω), T
A
= 25°C,
unless otherwise specified.
(1) The typical curve for Current Limit is measured in closed loop using the Typical Application Circuit by increasing I
OUT
until the peak
inductor current stops increasing. The value given in Electrical Characteristics 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 20 ns × V
IN
/ L.
V
LED
= 1.5 V
Figure 14. Active (Non-Switching) Supply Current vs V
IN
V
OUT
= 5 V I
OUT
= 400 mA
Figure 15. Active (Switching) Supply Current vs V
IN
Figure 16. Closed Loop Current Limit vs V
IN
(Flash Duration Register Bits [6:5] = 00)
(1)
)
Figure 17. Closed Loop Current Limit vs V
IN
(Flash Duration Register Bits [6:5] = 01)
(1)
)
Figure 18. Closed Loop Current Limit vs V
IN
(Flash Duration Register Bits [6:5] = 10)
(1)
)
Figure 19. Closed Loop Current Limit vs V
IN
(Flash Duration Register Bits [6:5] = 11)
(1)
)
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