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參數(shù)資料
| 型號： | LT3468ES5-2#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封裝： | PLASTIC, SOT-23, MO-193, 5 PIN |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 591K |
| 代理商： | LT3468ES5-2#PBF |
LT3468/LT3468-1/LT3468-2
9
346812f
Table 2. Pre-Designed Transformers - Typical Specifications Unless Otherwise Noted.
SIZE
LPRI
LPRI-LEAKAGE
RPRI
RSEC
FOR USE WITH
TRANSFORMER NAME
(W
× L × H) mm
(
H)
(nH)
N
(m
)()
VENDOR
LT3468/LT3468-2
SBL-5.6-1
5.6
× 8.5 × 4.0
10
200 Max
10.2
103
26
Kijima Musen
LT3468-1
SBL-5.6S-1
5.6
× 8.5 × 3.0
24
400 Max
10.2
305
55
Hong Kong Office
852-2489-8266 (ph)
kijimahk@netvigator.com (email)
LT3468
LDT565630T-001
5.8
× 5.8 × 3.0
6
200 Max
10.4
100 Max
10 Max
TDK
LT3468-1
LDT565630T-002
5.8
× 5.8 × 3.0
14.5
500 Max
10.2
240 Max 16.5 Max
Chicago Sales Office
LT3468-2
LDT565630T-003
5.8
× 5.8 × 3.0
10.5
550 Max
10.2
210 Max
14 Max
(847) 803-6100 (ph)
www.components.tdk.com
LT3468/LT3468-1
T-15-089
6.4
× 7.7 × 4.0
12
400 Max
10.2
211 Max
27 Max
Tokyo Coil Engineering
LT3468-1
T-15-083
8.0
× 8.9 × 2.0
20
500 Max
10.2
675 Max
35 Max
Japan Office
0426-56-6262 (ph)
www.tokyo-coil.co.jp
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
=
10
.
(LT3468-2)
I
N
PK SEC
=
07
.
(LT3468-1)
For the circuit of Figure 6 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/LT3468-2
applications. Another option is to use the BAV23S dual
silicon diodes. Toshiba makes a dual diode named 1SS306
which also meets all the requirements. The CRF02 is a
single diode with an 800V reverse voltage rating which is
also suitable. Table 3 shows the various diodes and
relevant specifications. Use the appropriate number of
diodes to achieve the necessary reverse breakdown volt-
age.
SW Pin Clamp Diode Selection
The diode D2 in Figure 6 is needed to clamp the SW node.
Due to the new control scheme of the LT3468/LT3468-1/
LT3468-2, the SW node may go below ground during a
switch cycle. The clamp diode prevents the SW node from
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
CRF02
1x800
500
Not Specified
www.semicon.toshiba.co.jp
APPLICATIO S I FOR ATIO
WU
U
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