LT3485EDD-2#PBF Linear Technology, LT3485EDD-2#PBF Datasheet - Page 14

• Manufacturer Part Number: LT3485EDD-2#PBF
• Description: IC CHARGER PHOTOFLASH 10-DFN
• Manufacturer: Linear Technology

Specifications of LT3485EDD-2#PBF

• Applications: Photoflash Capacitor Charger, Xenon
• Current - Supply: 5mA
• Voltage - Supply: 1.7 V ~ 10 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-DFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LT3485-0/LT3485-1/
LT3485-2/LT3485-3
APPLICATIO S I FOR ATIO
Board Layout
The high voltage operation of the LT3485-0/LT3485-1/
LT3485-2/LT3485-3 demands careful attention to board
layout. You will not get advertised performance with
careless layout. Figure 7 shows the recommended com-
ponent placement. Keep the area for the high voltage end
of the secondary as small as possible. Also note the larger
than minimum spacing for all high voltage nodes in order
14
PHOTOFLASH
CAPACITOR
C
OUT
U
+
(DUAL DIODE)
U
Figure 7. Suggested Layout: Keep Electrical Path Formed by C1,
Transformer Primary and LT3485-0/LT3485-1/LT3485-2/LT3485-3 Short
D1
V
IN
SECONDARY
W
•
T1
U
•
PRIMARY
C2
CHARGE
V
BAT
to meet breakdown voltage requirements for the circuit
board. It is imperative to keep the electrical path formed
by C1, the primary of T1, and the LT3485-0/LT3485-1/
LT3485-2/LT3485-3 as short as possible. If this path is
haphazardly made long, it will effectively increase the
leakage inductance of T1, which may result in an overvolt-
age condition on the SW pin.
C1
1
2
3
4
5
11
10
9
8
7
6
V
MONT
C3
3485 F07
R1
DONE
IGBTPWR
IGBTIN
IGBTOUT
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