Datasheet

11
LT1316
TYPICAL APPLICATIONS N
U
Efficiency vs Load Current
LOAD CURRENT (mA)
1
40
EFFICIENCY (%)
50
60
70
80
10 100
1316 TA04
90
36V
IN
72V
IN
48V
IN
+
+
LT1316
LBI
LB0 FB
SHDN
7
1
2
R3
604k
1%
Q3
2N3904
– 48V
R2
1.30M
1%
R5
69.8k
1%
R6
121k
1%
R7
432k, 1%
Q2
MPSA92
8
34
6
R4
2M
R1
1.3M
C1
0.1µF
C2
0.022µF
C4
47µF
D2
1N4148
C3
47µF
D1
1N5817
T1
10:1:1
L3
2
1
6
7
4
3
L1
V
OUT
5V
50mA
5
Q1
D3
1N4148
V
IN
SW
R
SET
GND
T1= DALE LPE-4841-A313 (605-665-9301) 
 L
PRI
: 2mH
 R
DS(ON)
: 4.3Ω AT V
GS
= 2.5V
R6, Q2,R7 MUST BE PLACED NEXT
TO THE FB PIN
I
IN
= 190µA WHEN
V
IN
= 48V, I
LOAD
= 1mA

L2
V
A
1316 • TA03
Nonisolated –48V to 5V Flyback Converter