Datasheet

LT3751
34
3751fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2008
LT 0612 REV C • PRINTED IN USA
relaTeD parTs
Typical applicaTion
300V Regulated Power Supply
PART NUMBER DESCRIPTION COMMENTS
LTC3225 150mA Supercapacitor Charger V
IN
: 2.75V to 5.5V, Charges Two Supercapacitors in Series to 4.8V or 5.3V
LT3420/LT3420-1 1.4A/1A, Photoflash Capacitor Charger
with Automatic Top-Off
Charges 220µF to 320V in 3.7 Seconds from 5V, V
IN
: 2.2V to 16V, I
SD
< 1µA,
10-Lead MS Package
LT3468/LT3468-1/
LT3468-2
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,
V
IN
= 3.6V), I
SD
< 1µA, ThinSOT™ Package
LT3484-0/LT3484-1/
LT3484-2
1.4A, 0.7A, 1A Photoflash Capacitor Charger V
IN
: 1.8V to 16V, Charge Time: 4.6 Seconds for LT3484-0 (0V to 320V, 100µF,
V
IN
= 3.6V), I
SD
< 1µA, 2mm × 3mm 6-Lead DFN Package
LT3485-0/LT3485-1/
LT3485-2/LT3485-3
1.4A, 0.7A, 1A, 2A Photoflash Capacitor
Charger with Output Voltage Monitor and
Integrated IGBT
V
IN
: 1.8V to 10V, Charge Time: 3.7 Seconds for LT3485-0 (0V to 320V, 100µF,
V
IN
= 3.6V), I
SD
< 1µA, 3mm × 3mm 10-Lead DFN Package
LT3585-0/LT3585-1/
LT3585-2/LT3585-3
1.2A, 0.55A, 0.85A, 1.7A Photoflash
Capacitor Charger with Adjustable Input
Current and IGBT Drivers
V
IN
: 1.5V to 16V, Charge Time: 3.3 Seconds for LT3585-3 (0V to 320V, 100µF,
V
IN
= 3.6V), I
SD
< 1µA, 3mm × 2mm DFN-10 Package
LT3750 Capacitor Charger Controller V
IN
: 3V to 24V, Charge Time: 300ms for (0V to 300V, 100µF) MSOP-10 Package
UVLO1
OVLO1
UVLO2
OVLO2
RDCM
RV
TRANS
T1
1:10
D1
V
OUT
300V
0mA TO 270mA
V
TRANS
24V
V
CC
C3
680µF
3751 TA08
LT3751
GND RBG
R6
40.2k
OFF ON
C2
2.2µF
×5
V
CC
24V
C1
10µF
•
•
R7
18.2k
M1
R5
6mΩ
+
+
C4
20µF
R8*
274k
* DEPENDING ON DESIRED OUTPUT
VOLTAGE, R8 MUST BE SPLIT
INTO MULTIPLE RESISTORS TO
MEET MANUFACTURER’S VOLTAGE
SPECIFICATION.
V
TRANS
V
CC
R9
1.13k
R1
432k
R2
475k
R4
475k
R3
432k
TO
MICRO
C1: 25V X5R OR X7R CERAMIC CAPACITOR
C2: 25V X5R OR X7R CERAMIC CAPACITOR
C3: 25V ELECTROLYTIC
C4: 330V RUBYCON PHOTOFLASH CAPACITOR
D1: VISHAY US1M 1000V
M1: FAIRCHILD FQP34N20L
R1 THROUGH R4: USE 1% 0805 RESISTORS
R5: IRC LR SERIES 2512 RESISTOR
T1: SUMIDA PS07-299, 20A TRANSFORMER
CSN
FB
DONE
FAULT
V
CC
CLAMP
CHARGE
RV
OUT
HVGATE
LVGATE
CSP
C5
10nF