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LT1950IGN Fiches technique(PDF) 17 Page - Linear Technology

No de pièce LT1950IGN
Description  Single Switch PWM Controller with Auxiliary Boost Converter
PDF  20 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LT1950IGN Fiches technique(HTML) 17 Page - Linear Technology

Back Button LT1950IGN Datasheet HTML 12Page - Linear Technology LT1950IGN Datasheet HTML 13Page - Linear Technology LT1950IGN Datasheet HTML 14Page - Linear Technology LT1950IGN Datasheet HTML 15Page - Linear Technology LT1950IGN Datasheet HTML 16Page - Linear Technology LT1950IGN Datasheet HTML 17Page - Linear Technology LT1950IGN Datasheet HTML 18Page - Linear Technology LT1950IGN Datasheet HTML 19Page - Linear Technology LT1950IGN Datasheet HTML 20Page - Linear Technology  
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LT1950
17
sn1950 1950fs
SLOPE
VREF
ROSC
BLANK
SYNC
FB
COMP
VIN
VIN2
VSEC
SHDN
GATE
ISENSE
GND
PGND
LT1950
5
6
3
9
4
2
1
15
11
16
7
12
10
8
13
210k
27k
6.8k
0.1
µF
+VIN
+VIN
–VIN
T1
PA0581
+VOUT
CIN
2.2
µF
100V
X5R
36V
TO 72V
INPUT
10V
BIAS
470k
18k
232k
24.9k
47
µF
Si7450
330R
470pF
18k
1
µF
1
µF
47k
4
3
5
2
1
8.2V
22k
U2
LT1009
U3
LT1797
FMMT625
OC1
1950 F13
47
µH
0.015
Figure 13. 36V to 72V Input to 26V at 5A Nonsynchronous Forward Converter
LOAD CURRENT (A)
1
5
1950 F12
2
3
4
94
93
92
91
90
89
88
87
86
85
84
VIN = 48V
VOUT = 26V
fOSC = 235kHz
Figure 12. LT1950-Based Nonsynchronous
Forward Converter Efficiency vs Load
Current (Figure 13 Circuit)
High Efficiency, Isolated 26V 5A Output,
Nonsynchronous Forward Converter
Figure 13 illustrates a nonsynchronous forward converter
based on the LT1950 to provide a highly efficient, 26V 5A
isolated output from 48V input. The LT1950-based con-
verter using a single switch topology and utilizing the
LT1950s adaptive maximum duty cycle clamp is a simple
and highly optimized solution. Peak efficiencies of 92.8%
(Figure 12) are achievable. Transformer and inductor are
standard components. The quarter brick sized DC/DC
converter (2.3" by 1.45") delivers over 125W and is only
0.4" high. The 26V converter can be used as a “front line”
(isolating) converter in telecom systems with multiple
outputs.
APPLICATIO S I FOR ATIO



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