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参数资料
| 型号： | LT3585EDDB-3#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.85 A BATTERY CHARGE CONTROLLER, PDSO10 |
| 封装： | 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-10 |
| 文件页数： | 4/20页 |
| 文件大小： | 423K |
| 代理商： | LT3585EDDB-3#PBF |
LT3585-0/LT3585-1
LT3585-2/LT3585-3
12
3585f
APPLICATIO S I FOR ATIO
WU
UU
It is important not to minimize the leakage inductance to
a very low level. Although this would result in a very low
leakage spike on the SW pin, the parasitic capacitance of the
transformer would become large. This will adversely affect
the charge time of the photoash circuit. Linear Technology
has worked with several leading magnetic component man-
ufacturers to produce predesigned yback transformers
for use with the LT3585-0 /LT3585-1/LT3585-2/LT3585-3.
Table 2 shows the details of several of these transformers.
Output Diode Selection
The rectifying diode(s) should be low capacitance type
with sufcient reverse voltage and forward current rat-
ings. The peak reverse voltage that the diode(s) will see
is approximately:
VPK(R) = VOUT + (N VBAT)
The peak current of the diode is simply:
I
N
LT
I
N
LT
PK SEC
()
.
=
()
=
2
3585 3
14
358
-
5
1
3585 2
07
-0
-
()
=
()
=
I
N
LT
I
N
PK SEC
()
.
LT3585 1
-
()
For the circuit of Figure 8 with VBAT of 5V, VPK(R) is 371V
and IPK(SEC) is 137mA. The GSD2004S dual silicon diode
is recommended for most applications. Table 3 shows
the various diodes and relevant specications. Use the
appropriate number of diodes to achieve the necessary
reverse breakdown voltage.
Capacitor Selection
For the input bypass capacitors, high quality X5R or X7R
types should be used. Make sure the voltage capability of
the part is adequate.
MUST BE
LESS THAN 60V
MUST BE
LESS THAN 50V
3585 F05
A
B
VSW
0V
Figure 4. LT3585 SW Voltage Waveform
Figure 5. New Transformer Design Check
Table 2. Predesigned Transformers—Typical Specications Unless Otherwise Noted
FOR USE
WITH
TRANSFORMER
DESIGNATION
SIZE
(W
× L × H) (mm)
LPRI
(H)
LPRI LEAKAGE
(nH )
N
RPRI
(m
Ω)
RSEC
(
Ω)
VENDOR
LT3585-1
LT3585-0/
LT3585-2
SBL-5.6S-1
SBL-5.6-1
5.6
× 8.5 × 3.0
5.6
× 8.5 × 4.0
24
10
400 Max
200 Max
10.2
305
103
55
26
Kijima Musen
Hong Kong Ofce
852-2489-8266
LT3585-1
LT3585-0
LT3585-1
LT3585-2
LT3585-3
LDT565620ST-203
LDT565630T-001
LDT565630T-002
LDT565630T-003
LDT565630T-041
5.8
× 5.8 × 2.0
5.8
× 5.8 × 3.0
5.8
× 5.8 × 3.0
5.8
× 5.8 × 3.0
5.8
× 5.8 × 3.0
8.2
6
14.5
10.5
4.7
390 Max
200 Max
500 Max
550 Max
150 Max
10.2
10.4
10.2
10.4
370 Max
100 Max
240 Max
210 Max
90 Max
11.2 Max
10 Max
16.5 Max
14 Max
6.4 Max
TDK
Chicago Sales Ofce
(847) 803-6100
www.components.tdk.com
LT3585-0
LT3585-1
LT3585-2
LT3585-3
TTRN-0530-000-T
TTRN-0530-012-T
TTRN-0530-021-T
TTRN-0530-022-T
5.0
× 5.0 × 3.0
5.0
× 5.0 × 3.0
5.0
× 5.0 × 3.0
5.0
× 5.0 × 3.0
6.6
16.0
11.8
4.0
200 Max
400 Max
300 Max
10.3
128 Max
515 Max
256 Max
102 Max
28 Max
32 Max
37 Max
16 Max
Tokyo Coil Engineering
Japan Ofce
0426-56-6262
VSW
10V/DIV
100ns/DIV
3585 F04
VBAT = 3.6V
VOUT = 320V
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