lt3825 Linear Technology Corporation, lt3825 Datasheet - Page 30

• Manufacturer Part Number: lt3825
• Description: Isolated No-opto Synchronous Flyback Controller With Wide Input Supply Range
• Manufacturer: Linear Technology Corporation

LT3825
TYPICAL APPLICATIONS
30
36V TO 72V
92
90
88
86
84
82
78
80
2.2μF
V
100V
IN
2
+
36V
3
IN
Effi ciency vs Load Current
C1 TO C4: TDK C3225X5R0J476M
C5: SANYO 6TPD470M
L1: VISHAY IHLP2525CZERR10M
4
72V
402k
1%
15k
1%
5
LOAD CURRENT (A)
IN
12k
48V
6
UVLO
PGDLY
t
28.7k
1%
ON
3.01k
1%
IN
7
100k
SYNC
FB
8
750Ω
T1
•
9
R
CMP
10
ENDLY
V
3825 TA04b
11 12
CC
47μF
47pF
20Ω
Q1: ZETEX FMMT618
Q2: ZETEX FMMT718
T1: PULSE PA1477NL
BAS21
150k
LT3825
+
48V to 5V at 12A Isolated Supply
OSC
47k
1/4W
GND SFST
SG
SG
PG
0.1μF
0.01μF
Si4490DY
SENSE
SENSE
C
CMP
V
C
+
–
20Ω
100pF
250V
10k
0.02Ω
1/2W
1nF
10nF
3.43
3.38
3.33
3.28
3.23
3.18
3.13
•
PA0184
T1
2
Output Regulation vs Load Current
SG
•
330Ω
0.1μF
•
B0540W
4
Si7336ADP
C1 TO C4
47μF ×3
•
LOAD CURRENT (A)
2.2nF
10k
47Ω
0.1μH
6
L1
Q1
Q2
BAT54
15Ω
8
48V
36V
72V
IN
IN
IN
10
C5
470μF
3825 TA04a
3825 TA04c
1μF
12
2.2μF
250V
V
3.3V
12A
OUT
+
3525fa