LT3468 Linear Technology, LT3468 Datasheet - Page 10

• Manufacturer Part Number: LT3468
• Description: Photoflash Capacitor Charger in ThinSOT
• Manufacturer: Linear Technology

LT3468/LT3468-1
APPLICATIO S I FOR ATIO
Board Layout
The high voltage operation of the LT3468/LT3468-1 de-
mands careful attention to board layout. You will not get
advertised performance with careless layout. Figure 6
shows the recommended component placement. Keep the
area for the high voltage end of the secondary as small as
possible. Also note the larger than minimum spacing for
10
Figure 6. Suggested Layout: Keep electrical path formed by C1, Transformer Primary and LT3468/LT3468-1 short.
CHARGE
DONE
V
IN
U
R1
U
4
5
W
3
2
1
C1
U
D2
•
all high voltage nodes in order 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
LT3468/LT3468-1 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.
T1
•
(DUAL DIODE)
D1
3468 F01
+
C
PHOTOFLASH
CAPACITOR
OUT
34681i