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LM51551 Datasheet(PDF) 13 Page - Texas Instruments

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Part # LM51551
Description  2.2-MHz Wide Input Nonsynchronous Boost, SEPIC, Flyback Controller
Download  49 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM51551 Datasheet(HTML) 13 Page - Texas Instruments

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BIAS
= VSUPPLY
UVLO
VCC
SS
GATE
2.7 V
0.52 V
2.85 V
50-µs
VCC UV delay
1.5 V
1 V
SS
1 V
=
VLOAD(TARGET)
VLOAD
Shutdown
Standby
tSS
4.5 V
UVLO should be greater than
0.55 V more than 1.5µs to start-up
1.5 µs
65-µs (typical)
internal start-up delay
SS is grounded
with 2 cycles
delay
> 35 µs
VLOAD
65-µs (typical)
internal start-up delay
UVLO
VCC
SS
VLOAD
GATE
2.7 V
0.55 V
2.85 V
50-µs
VCC UV delay
1.5 V
1 V
SS
1 V
=
VLOAD(TARGET)
VLOAD
Shutdown
Standby
TSS
4.5 V
UVLO should be greater than
0.55 V more than 1.5 µs to start-up
1.5 µs
> 3 cycles
SS is grounded
with 2 cycles
delay
65-µs (typical)
internal start-up delay
BIAS
= VSUPPLY
13
LM5155
www.ti.com
SNVSB75 – DECEMBER 2018
Product Folder Links: LM5155
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
Feature Description (continued)
Figure 18. Boost Start-Up Waveforms
Case 1: Start-Up by 2.85-V VCC UVLO, UVLO Toggle After Start-Up
Figure 19. Boost Start-Up Waveforms
Case2: Start-Up When VCC > 4.5 V, EN Toggle After Start-Up


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