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LM51551DSSR Datasheet(PDF) 11 Page - Texas Instruments

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Part # LM51551DSSR
Description  2.2-MHz Wide Input Nonsynchronous Boost, SEPIC, Flyback Controller
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM51551DSSR Datasheet(HTML) 11 Page - Texas Instruments

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BIAS
VCC
FB
PGOOD
VLOAD
VSUPPLY
+
±
+
±
VOVTH
VUVTH
VCC
Regulator
BIAS
VCC_EN
VCC
UVLO
VCC_OK
FB
CIN
COUT
LM
RLOAD
Q1
D1
RS
ISLOPE
GATE
CS
VCS1
VCS2
S
Q
Q
R
Clock
Generator
AGND
PGND
Clock_Sync
+
±
+
±
VCS1
VCSTH
VCS2
PWM
Comparator
C/L
Comparator
+
±
RCOMP
CCOMP
RT
COMP
FB
SS
+
VREF
ISS
Optional
Hiccup Mode
IUVLO
UVLO/
SYNC
+
±
+
±
VEN
VCC_EN
SYNC
Detector
Clock_Sync
TSD
VCC_OK
RUN
VSUPPLY
VUVLO
CSS
RUVLOT
RUVLOB
RFBT
RFBB
CVCC
OVP
GCOMP
RT
OVP
TSD
11
LM5155
www.ti.com
SNVSB75 – DECEMBER 2018
Product Folder Links: LM5155
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
9 Detailed Description
9.1 Overview
The LM5155 device is a wide input range, non-synchronous boost controller that uses peak-current-mode
control. The device can be used in boost, SEPIC, and flyback topologies.
The LM5155 device can start up from a 1-cell battery with a minimum of 2.97 V if the BIAS pin is connected to
the VCC pin. It can operate with the input supply voltage as low as 1.5 V if the BIAS pin is greater than 3.5 V.The
internal VCC regulator also supports BIAS pin operation up to 45 V (50-V absolute maximum) . The switching
frequency is dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz
minimizes AM band interference and allows for a small solution size and fast transient response.
The device features a 1.5-A standard MOSFET driver and a low 100-mV current limit threshold. The device also
supports the use of an external VCC supply to improve efficiency. Low operating current and pulse skipping
operation improve efficiency at light loads.
The device has built-in protection features such as cycle-by-cycle current limit, overvoltage protection, line UVLO
and thermal shutdown. Hiccup mode overload protection is available in the LM51551 device option. Additional
features include low shutdown IQ, programmable soft start, programmable slope compensation, precision
reference, power good indicator, and external clock synchronization.
9.2 Functional Block Diagram


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