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参数资料
| 型号： | LT3468ES5#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封装： | PLASTIC, SOT-23, MO-193, 5 PIN |
| 文件页数： | 2/12页 |
| 文件大小： | 591K |
| 代理商： | LT3468ES5#PBF |
LT3468/LT3468-1/LT3468-2
10
346812f
Board Layout
The high voltage operation of the LT3468/LT3468-1/
LT3468-2 demands careful attention to board layout. You
will not get advertised performance with careless layout.
Figure 5 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 all high voltage nodes in order to meet break-
down 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/LT3468-2 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 overvoltage condition on the SW
pin.
APPLICATIO S I FOR ATIO
WU
U
Figure 5. Suggested Layout: Keep Electrical Path Formed by C1,
Transformer Primary and LT3468/LT3468-1/LT3468-2 Short.
D2
R1
D1
(DUAL DIODE)
C1
SECONDARY
PRIMARY
COUT
PHOTOFLASH
CAPACITOR
T1
VIN
CHARGE
DONE
+
4
5
3
2
1
3468 F05
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
MA2Z720
40
Panasonic
(408) 487-9510
www.panasonic.co.jp
TYPICAL APPLICATIO S
U
going too far below ground. The diode is required for
proper operation of the circuit. The recommended diode
should be a Schottky diode with at least a 500mA peak
forward current capability. The diode forward voltage drop
should be 600mV or less at 500mA of forward current.
Reverse voltage rating should be 40V or higher. Table 4
shows various recommended clamping diodes.
LT3468
CHARGE
GND
VIN
SW
+
DONE
CHARGE
C1
4.7
F
R1
100k
T1
1:10.2
VIN
2.5V TO 8V
320V
1
2
4
5
3468 F06
D2
COUT
PHOTOFLASH
CAPACITOR
C1: 4.7
F, X5R OR X7R, 10V
T1: KIJIMA MUSEN PART# SBL-5.6-1, LPRI = 10H, N = 10.2
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
D2: ZETEX ZHCS400 OR EQUIVALENT
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
D1
LT3468-1
CHARGE
GND
VIN
SW
+
DONE
CHARGE
C1
4.7
F
R1
100k
T1
1:10.2
COUT
PHOTOFLASH
CAPACITOR
VIN
2.5V TO 8V
D2
320V
D1
4
3
5
6
C1: 4.7
F, X5R OR X7R, 10V
T1: KIJIMA MUSEN PART# SBL-5.6S-1, LPRI = 24H, N = 10.2
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
D2: ZETEX ZHCS400 OR EQUIVALENT
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
3468 F07
Figure 6. LT3468 Photoflash Charger Uses
High Efficiency 4mm Tall Transformer
Figure 7. LT3468-1 Photoflash Charger Uses
High Efficiency 3mm Tall Transformer
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