16
LT3750
3750fa
© LINEAR TECHNOLOGY CORPORATION 2005
LT 0106 REV A • PRINTED IN THE USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
TYPICAL APPLICATIO
U
300V, 9A, 2.5mF Capacitor Charger
V
CC
DONE
CHARGE
RV
OUT
RDCM
GATE
SOURCE
V
TRANS
60.4k
T1
1:10
D1
V
OUT
300V
V
TRANS
V
CC
12V
•
•
C4
2.5mF
43k
8mΩ
M1
3750 TA05a
LT3750
GND RBG
100k
2.49k 100pF
OFF ON
C1
10µF
C1, C2: 25V X5R OR X7R CERAMIC CAPACITOR
C3: 25V SANYO OS-CON 25SVP56M
C4: CORNELL DUBILIER 7P252V360N082
D1: DIODES INC. MURS160
M1: PHILIPS PHM21NQ15T
T1: MIDCOM 32052 FLYBACK TRANSFORMER
C2
10µF
C3
56µF
×3
+
4, 5
6, 7
1
10
Efficiency Charge Time
V
OUT
(V)
0
70
EFFICIENCY (%)
80
75
85
90
95
100
50
100 150 200
3750 TA05b
250 300
V
TRANS
= 18V
V
TRANS
= 6V
V
TRANS
= 12V
TIME (SECONDS)
0
0
V
OUT
(V)
50
100
150
200
250
300
123456
3750 TA05c
87
V
TRANS
= 18V
V
TRANS
= 6V
V
TRANS
= 12V
PART NUMBER DESCRIPTION COMMENTS
LT3420/LT3420-1 1.4A/1A, Photoflash Capacitor Charger with Charges 220µF to 320V in 3.7 Seconds from 5V, V
IN
: 2.2V to 16V,
Automatic Top-Off I
SD
< 1µA, 10-Lead MS Package
LT3468/LT3468-1 1.4A, 1A, 0.7A, Photoflash Capacitor Charger V
IN
: 2.5V to 16V, Charge Time: 4.6 Seconds for LT3468 (0V to 320V, 100µF,
LT3468-2 V
IN
= 3.6V), I
SD
< 1µA, ThinSOT Package
LT3484-0/LT3484-1 1.4A, 0.7A, 1A Photoflash Capacitor Charger V
IN
: 1.8V to 16V, Charge Time: 4.6 Seconds for LT3484-0
LT3484-2 (0V to 320V, 100µF, V
IN
= 3.6V), I
SD
< 1µA, 2mm × 3mm 6-Lead
DFN Package
LT3485-0/LT3485-1 1.4A, 0.7A, 1A, 2A Photoflash Capacitor Charger V
IN
: 1.8V to 10V, Charge Time: 3.7 Seconds for LT3485-0
LT3485-2/LT3485-3 with Output Voltage Monitor and Integrated IGBT (0V to 320V, 100µF, V
IN
= 3.6V), I
SD
< 1µA, 3mm × 3mm 10-Lead DFN
Driver
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