參數(shù)資料
型號(hào): LT1952MPGN#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO16
封裝: 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16
文件頁(yè)數(shù): 16/28頁(yè)
文件大小: 357K
代理商: LT1952MPGN#TRPBF
LT1952/LT1952-1
23
19521fe
36V to 72V Input, 3.3V 40A Converter
AnLT1952-basedsynchronousforwardconverterprovides
theidealsolutionforpowersuppliesrequiringhighefficiency
atlowoutputvoltagesandhighloadcurrents.The3.3V40A
solution in Figure 18 achieves peak efficiencies of 92.5%
(Figure 17) by minimizing power loss due to rectification
at the output. Synchronous rectifier control output SOUT,
with programmable delay, optimizes timing control for a
secondarysidesynchronousMOSFETcontroller(LTC3900)
which results in high efficiency synchronous rectification.
TheLT1952/LT1952-1useaprecisioncurrentlimitthreshold
at the OC pin combined with a soft-start hiccup mode to
provide low stress output short-circuit protection. The
maximumoutputcurrentwillvaryonly10%overthefullVIN
range. During short-circuit the average power dissipation
of the circuit will be lower than 15% of maximum rated
power thanks to a soft-start controlled hiccup mode.
APPLICATIONS INFORMATION
This allows a significant reduction in power component
sizing using the LT1952-based converter.
OUTPUT CURRENT (A)
0
10
EFFICIENCY
(%)
50
1952 F17
20
30
40
94
93
92
91
90
89
88
87
86
VIN = 48V
VOUT = 3.3V
fOSC = 300kHz
Figure 17. LT1952-Based Synchronous Forward Converter
Efficiency vs Load Current (For Circuit in Figure 18)
Figure 18. 36V to 72V, 3.3V at 40A Synchronous Forward Converter
LTC3900
8V
BIAS
VU1
220pF
BAT760
8V
BIAS
3
FG
5
CG
+VIN
36V TO 72V
PA0912.002
BAS516
BCX55
VOUT
3.3V, 40A
10k
1nF
8V
BIAS
1mF
15k
560
COUT
100F
3x
0.1F
2.2mF
1nF
12V
Q2
PH3230
2x
Q3
PH3230
2x
+
18V
270
PS2801
T2
Q4470-B
2.2nF
VU1
18k
249k
80.6k
1F
0.1F
10k
82k
47k
4
3
5
4
8
2
1
LT1009
LT1797
1952 F18
L1
SD_VSEC
OUT
LT1952
7
14
ROSC
VIN
3
15
BLANK
GND
9
8
SS_MAXDC
PGND
5
13
DELAY
12
VR = 2.5V
OC
6
11
COMP
ISENSE
1
10
FB = 1.23V
SOUT
2
16
Si7846
1
GND
6
CS+
2
VCC
4
CS
7
SYNC
8
TIMER
370k
10m
1F
470
39k
13.2k
115k
27k
0.22F
0.1F
10k
59k
33k
2.2k
22k
L1: PA0713, PULSE ENGINEERING
ALL CAPACITORS X7R, CERAMIC, TDK
T2: COILCRAFT
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