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LM3556 Datasheet(PDF) 20 Page - Texas Instruments

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Part # LM3556
Description  1.5A Synchronous Boost LED Flash Driver w/ High-Side Current Source
PDF  31 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3556 Datasheet(HTML) 20 Page - Texas Instruments

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tBLANK
tPERIOD
tPERIOD
tPERIOD
tACTIVE
tBLANK
tPERIOD
tPERIOD
ITORCH
tBLANK
tR
tF
tPULSE
tPULSE
tPERIOD
tR
tF
tPULSE
tPULSE
tPERIOD
LM3556
SNVS796C – AUGUST 2011 – REVISED APRIL 2013
www.ti.com
Indicator Period Count Register (0x05)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RFU
RFU
RFU
RFU
RFU
NPERIOD
000 = 0 (default)
001 = 1
010 = 2
011 = 3
100 = 4
101 = 5
110 = 6
111 = 7
Figure 39. Indicator Usage
1. Number of periods (tPERIOD = tR + tF + tPULSE × 2)
2. Active Time (tACTIVE = tPERIOD × NPERIOD)
3. Blank Time (tBLANK = tACTIVE × NBLANK)
Figure 40. Single Pulse with Dead Time
Figure 41. Multiple Pulse with Dead Time
Torch Ramp Time Register (0x06)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RFU
RFU
Torch Ramp-Up Time
Torch Ramp-Down Time
000 = 16 ms (default)
000 = 16 ms (default)
001 = 32 ms
001 = 32 ms
010 = 64 ms
010 = 64 ms
011 = 128 ms
011 = 128 ms
100 = 256 ms
100 = 256 ms
101 = 512 ms
101 = 512 ms
110 = 1.024s
110 = 1.024s
111 = 2.048s
111 = 2.048s
20
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Copyright © 2011–2013, Texas Instruments Incorporated
Product Folder Links: LM3556



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