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LM5145 датащи(PDF) 41 Page - Texas Instruments

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номер детали LM5145
подробное описание детали  6-V to 75-V Synchronous Buck DC-DC Controller With Wide Duty Cycle Range
PDF  67 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

LM5145 датащи(HTML) 41 Page - Texas Instruments

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3
4
5
6
7
10
11
17
18
19
14
20
BST
HO
SW
LO
PGND
RT
SS/TRK
COMP
FB
AGND
VIN = 14.4 V to 48 V
VOUT1 = 12 V
LM5145
VOUT
SYNC In
GND
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
CSS
RFB2
RFB1
RC2
CC2
CC1
RC1
CC3
RRT
Copyright © 2017, Texas Instruments Incorporated
CILIM
4.7 H
0.1 F
10 pF
33 nF
5 u 4.7 F
RUV2
7.5 k
3.3 nF
5 u 47 F
RUV1
80.6 k
2.2 F
CVIN
402
0.1 F
2.37 k
33.2 k
56 pF
15 k
100
U1
24.9 k
680 pF
1
2
3
4
5
6
18
17
16
15
14
13
OUT
OUT
OUT(FB)
SET
FB
GND
IN
IN
IN(CP)
CP
EN
GND(CP)
LP38798SD-ADJ
U2
CCP
10 nF
RT
73.5 k
RB
10 k
CV2
1 F
CLDO_IN
1 F
VOUT1
VOUT2 = 10V
D1
RBST
2.2
41
LM5145
www.ti.com
SNVSAI4 – JUNE 2017
Product Folder Links: LM5145
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
9.2.2 Design 2 – High Density, 12-V, 10-A Rail With LDO Low-Noise Auxiliary Output for RF Power
Applications
Figure 59 shows the schematic diagram of a 400-kHz, 12-V output, 10-A synchronous buck regulator intended
for RF power applications.
An auxiliary 10-V, 800-mA rail to power noise-sensitive circuits is available using the LP38798 ultra-low noise
LDO as a post-regulator. The internal pull-up of the EN pin of the LP38798 facilitates direct connection to the
PGOOD of the LM5145 for sequential start-up control.
Figure 59. Application Circuit #2 With LM5145 48-V to 12-V Synchronous Buck Regulator at 400 kHz



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