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LT3468 Datasheet(PDF) 9 Page - Linear Technology

Part # LT3468
Description  Photoflash Capacitor Charger in ThinSOT
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3468 Datasheet(HTML) 9 Page - Linear Technology

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LT3468/LT3468-1
9
34681i
APPLICATIO S I FOR ATIO
Capacitor Selection
For the input bypass capacitor, a high quality X5R or X7R
type should be used. Make sure the voltage capability of
the part is adequate.
Output Diode Selection
The rectifying diode(s) should be low capacitance type
with sufficient reverse voltage and forward current rat-
ings. The peak reverse voltage that the diode(s) will see is
approximately:
VV
N V
PK R
OUT
IN
=+
()
The peak current of the diode is simply:
I
N
PK SEC
=
14
.
(LT3468)
I
N
PK SEC
=
07
.
(LT3468-1)
Table 3. Recommended Output Diodes
MAX REVERSE VOLTAGE
MAX FORWARD CONTINUOUS CURRENT
CAPACITANCE
PART
(V)
(mA)
(pF)
VENDOR
GSD2004S
2x300
225
5
Vishay
(Dual Diode)
(402) 563-6866
www.vishay.com
BAV23S
2x250
225
5
Philips Semiconductor
(Dual Diode)
(800) 234-7381
www.philips.com
1SS306
2x250
100
3
Toshiba
(Dual Diode)
(949) 455-2000
www.semicon.toshiba.co.jp
For the circuit of Figure 1 with VIN of 5V, VPK-R is 371V and
IPK-SEC is 137mA. The GSD2004S dual silicon diode is
recommended for most LT3468/LT3468-1 applications.
Another option is to use the BAV23S dual silicon diodes.
Toshiba makes a dual diode named 1SS306 which also
meets all the requirements. Table 3 shows the various
diodes and relevant specifications. Use the appropriate
number of diodes to achieve the necessary reverse break-
down voltage.
SW Pin Clamp Diode Selection
The diode D2 in Figure 1 is needed to clamp the SW node.
Due to the new control scheme of the LT3468/LT3468-1,
the SW node may go below ground during a switch cycle.
The clamp diode prevents the SW node from going too
far below ground. The diode is required for proper opera-
tion of the circuit. The recommended diode should be a
Schottky diode with at least a 500mA peak forward current
capability. Reverse voltage rating should be 40V or higher.
Table 4 shows various recommended clamping diodes.
Table 4. Recommended Clamp Diodes
MAX REVERSE VOLTAGE
PART
(V)
VENDOR
ZHCS400
40
Zetex
(631) 360-2222
www.zetex.com
B0540W
40
Diodes Inc.
(805) 446-4800
www.diodes.com


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