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LM5145 Datasheet(PDF) 45 Page - Texas Instruments

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Part # LM5145
Description  6-V to 75-V Synchronous Buck DC-DC Controller With Wide Duty Cycle Range
PDF  67 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM5145 Datasheet(HTML) 45 Page - Texas Instruments

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BST
HO
SW
LO
PGND
RT
SS/TRK
COMP
FB
AGND
VIN = 28 V to 75 V
VOUT = 24 V
LM5145
VOUT
SYNC In
GND
PGOOD
12
SYNCOUT
8
SYNCIN
9
NC
EN/UVLO
VIN
ILIM
PGOOD
SYNC Out
13
VCC
16
15
NC
EP
LF
COUT
Q1
Q2
CIN
RILIM
CVCC
CBST
RFB2
RFB1
RC2
CC2
CC1
RC1
CC3
RPG
RRT
Copyright © 2017, Texas Instruments Incorporated
CILIM
15 H
0.1 F
10 pF
5 u 2.2 F
RUV2
8.87 k
1 nF
7 u 10 F
RUV1
200 k
2.2 F
CVIN
499
0.1 F
2.49 k
72.3 k
18 pF
41.2 k
1 k
U1
20 k
22.6 k
390 pF
VTRACK
RTRK1
13.3 k
RTRK2
2.49 k
45
LM5145
www.ti.com
SNVSAI4 – JUNE 2017
Product Folder Links: LM5145
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
9.2.3 Design 3 – 150-W, Regulated 24-V Rail for Commercial Drone Applications With Output Voltage
Tracking Feature
Figure 72 shows the schematic diagram of a 150-W, regulated 24-V buck regulator for commercial drone
applications with output voltage tracking feature.
Figure 72. Application Circuit #3 With LM5145 48-V to 24-V Buck Regulator at 440 kHz
9.2.3.1 Design Requirements
The intended input, output, and performance parameters are shown in Table 10 for this implementation example
that derives power from large battery packs common to commercial drone and electric forklift applications.
Table 10. Design Parameters
DESIGN PARAMETER
VALUE
Input voltage range (steady state)
28 V to 75 V
Input transient voltage (peak)
85 V
Output voltage and current
24 V, 5 A
Switching frequency
440 kHz
Output voltage regulation
±1%
Load transient peak voltage deviation, 2.5-A load step
< 100 mV



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