lt3724 Linear Technology Corporation, lt3724 Datasheet - Page 21

• Manufacturer Part Number: lt3724
• Description: High Voltage, Current Mode Switching Regulator Controller
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIO S
4.5V to 20V Input to 12V at 25W Output SEPIC Converter with 60V Input Transient Capability
4.5V TO 20V
TRANSIENT
TO 60V
R2
130k
R1
14.7k
V
IN
47k
R4
D3
D1N4148
390pF
C
22μF
2x
25V
IN1
C1
C2
120pF
49.9k
RB
C
25V
1μF
IN2
100k
RA
R5
40.2k
C3
680pF
200k
R3
C1 = OPTIONAL TO REDUCE LED RIPPLE CURRENT
C
D1 = DIODESINC., B170
M1 = ZETEX, ZXMN10A07F
R
L1 = COILTRONICS, CTX300-4
IN
SENSE
1
3
4
5
6
7
8
= TDK, C4532X7R2A225K
V
SHDN
C
BURST_EN
V
V
SGND
IN
SS
FB
C
OPTIONAL
= VISHAY, WSL2010R0150FEA
CONTROL
DIMMER
1kHz
LT3724
U
SENSE
SENSE
BOOST
PGND
V
8V TO 60V
SW
TG
CC
+
–
16
15
14
12
11
10
9
High Voltage LED Driver with Dimmer Control
V
IN
100pF
C7
0.1μF
GSD2004
C1
D1B
C4
1μF
25V
M2
2N7002
R1
4.7M
C5, C
C
D2 = ON SEMI, MBRD660
L1 = COILCRAFT VERSAPAC VP5-D83
M1 = VISHAY, Si7852DP
D1A
GSD2004
OUT1
IN1
1
3
4
5
6
7
8
M1
= SANYO, OS-CON 16SVP330M
10Ω
C6
56pF
10Ω
, C
20μH
R6
R7
V
SHDN
C
BURST_EN
V
V
SGND
OUT2
IN
SS
FB
C
L1
LT3724
•
= TDKC453X7R1E226M
LED
R
0.010Ω
SENSE
SENSE
SENSE
22μF
20μH
BOOST
25V
C5
3x
PGND
L1
V
SW
TG
CC
•
+
–
16
15
14
12
11
10
9
D2
C1
(OPTIONAL)
16V
3724 TA07a
C
22μF
OUT2
C
C
330μF
1μF
16V
VCC
3724 TA03
12V AT 25W
OUT1
25V
300μH
B170
V
L1
D1
OUT
M1
ZXMN10A07F
I
ADJUST I
R
0.5Ω
LED
SENSE
=
92
91
90
89
88
87
86
85
R
0.15V
SENSE
0.1
LED
Efficiency and Power Loss
:
vs Load Current
LOAD CURRENT (A)
1
LOSS
V
IN
LT3724
= 15V
V
IN
V
V
IN
IN
= 20V
= 10V
= 15V
3724 TA07b
21
10
3724fb
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0