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LM51551DSST Datasheet(PDF) 7 Page - Texas Instruments

Part # LM51551DSST
Description  LM5155x 2.2-MHz Wide Input Nonsynchronous Boost, SEPIC, Flyback Controller
PDF  48 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LM51551DSST Datasheet(HTML) 7 Page - Texas Instruments

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Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over TJ = -40°C to 125°C. Unless otherwise
stated, VBIAS = 12 V, RT = 9.09 kΩ
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VEN(HYS)
Enable hysteresis
EN falling
0.03
V
UVLO/SYNC
VUVLO(RISING)
UVLO / SYNC threshold
UVLO rising
1.425
1.5
1.575
V
VUVLO(FALLING)
UVLO / SYNC threshold
UVLO falling
1.370
1.45
1.520
V
VUVLO(HYS)
UVLO / SYNC threshold
hysteresis
UVLO falling
0.05
V
IUVLO
UVLO hysteresis current
VUVLO = 1.6 V
4
5
6
uA
SS
ISS
Soft-start current
9
10
11
uA
SS pull-down switch RDSON
55
Ω
PULSE WIDTH MODULATION
fsw1
Switching frequency
RT = 220 kΩ
85
100
115
kHz
fsw2
Switching frequency
RT = 9.09 kΩ
1980
2200
2420
kHz
tON(MIN)
Minimum on-time
RT = 9.09 kΩ
50
ns
DMAX1
Maximum duty cycle limit
RT = 9.09 kΩ
80%
85%
90%
DMAX2
Maximum duty cycle limit
RT = 220 kΩ
90%
93%
96%
CURRENT SENSE
ISLOPE
Peak slope compensation current RT = 220 kΩ
22.5
30
37.5
uA
VCLTH
Current Limit threshold (CS-
PGND)
93
100
107
mV
HICCUP MODE PROTECTION (LM51551)
Hiccup enable cycles
64
Cycles
Hiccup timer reset cycles
8
Cycles
ERROR AMPLIFIER
VREF
FB reference
LM5155, LM51551
0.99
1
1.01
V
Gm
Transconductance
2
mA/V
COMP sourcing current
VCOMP = 1.2 V
180
uA
COMP clamp voltage
COMP rising (VUVLO = 2.0V)
2.5
2.8
V
COMP clamp voltage
COMP falling
1
1.1
V
OVP
VOVTH
Over-voltage threshold
FB rising (referece to VREF)
107%
110%
113%
Over-voltage threshold
FB falling (referece to VREF)
105%
PGOOD
PGOOD pull-down switch RDSON 1 mA sinking
90
Ω
VUVTH
Undervoltage threshold
FB falling (referece to VREF)
87%
90%
93%
Undervoltage threshold
FB rising (referece to VREF)
95%
MOSFET DRIVER
High-state voltage drop
100 mA sinking
0.25
V
Low-state voltage drop
100 mA sourcing
0.15
V
THERMAL SHUTDOWN
TTSD
Thermal shutdown threshold
Temperature rising
175
°C
Thermal shutdown hysteresis
15
°C
www.ti.com
LM5155, LM51551
SNVSB75E – DECEMBER 2018 – REVISED AUGUST 2023
Copyright © 2023 Texas Instruments Incorporated
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Product Folder Links: LM5155 LM51551



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