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LM3555TLX/NOPB Datasheet(PDF) 24 Page - Texas Instruments

Part # LM3555TLX/NOPB
Description  LM3555 Synchronous Boost Converter With 500-mA High-Side LED Driver and Dual-Mode Control Interface
PDF  37 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LM3555TLX/NOPB Datasheet(HTML) 24 Page - Texas Instruments

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IC1 IC0 VO1 VO0 FT3 FT2 FT1 FT0
Default:
0
0
0
0
1
1
1
1
Definition:
RF3 RF2 RF1 RF0 DR3 DR2 DR1 DR0
Default:
0
0
0
0
0110 0110 0110 0110
Definition:
24
LM3555
SNVS594G – DECEMBER 2008 – REVISED APRIL 2016
www.ti.com
Product Folder Links: LM3555
Submit Documentation Feedback
Copyright © 2008–2016, Texas Instruments Incorporated
7.6 Register Maps
7.6.1 Internal Registers of LM3555
REGISTER
INTERNAL HEX ADDRESS
POWER ON VALUE
Version Control Register
0x01
0000 1100
Indicator and Timer Register
0x02
0000 1111
Current Set Register
0x03
0110 1001
Control Register
0x04
1011 0100
Fault Register
0x05
0000 1000
7.6.2 Register Definitions
ARF3–RF0: unused
DR3–DR0: design revision = 1100
Figure 45. Version Control Register, Address: 0x01
IC1–IC0: indicator LED current control bits
VO1-VO0: VREF offset adjustment bits. used for diode detection.
FT3-FT0: software flash timer duration control bits
Figure 46. Indicator and Timer Register, Address: 0x02
Table 3. Indicator Currents
IC1
IC0
INDICATOR LED CURRENT
0
0
2.5 mA
0
1
5 mA
1
0
7.5 mA
1
1
10.0 mA
Table 4. Offset Voltages
VO1
VO0
VREFVOLTAGE
(OFFSET FROM 4.35 V)
0
0
4.35 V (+0 V)
0
1
4.65 V (+0.3 V)
1
0
4.05 V (
−0.3 V)
1
1
4.95 V (+0.6 V)
Table 5. Flash Timeout Duration
FT3
FT2
FT1
FT0
FLASH TIMEOUT DURATION
0
0
0
0
100 ms
0
0
0
1
150 ms
0
0
1
0
200 ms
0
0
1
1
250 ms



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