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| 型号： | LT3751IUFD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封装： | 4 X 5 MM, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 9/34页 |
| 文件大小： | 403K |
| 代理商： | LT3751IUFD#TRPBF |
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LT3751
17
3751fb
Figure 9. Maximum Switching Frequency
PEAK PRIMARY CURRENT (A)
L
PRI
/W
A
TT
(μH/W
A
TT
)
3751 F09
10.000
0.010
0.100
1.000
0.001
1
10
100
fMAX = 50kHz
fMAX = 100kHz
fMAX = 200kHz
APPLICATIONS INFORMATION
Table 1. Recommended Transformers
MANUFACTURER
PART NUMBER
SIZE L
× W × H (mm)
MAXIMUM IPRI (A)
LPRI (μH)
TURNS RATIO (PRI:SEC)
Coilcraft
www.coilcraft.com
DA2033-AL
DA2034-AL
GA3459-BL
GA3460-BL
HA4060-AL
HA3994-AL
17.4
× 24.1 × 10.2
20.6
× 30 × 11.3
32.65
× 26.75 × 14
32.65
× 26.75 × 14
34.29
× 26.75 × 14
34.29
× 28.75 × 14
5
10
20
50
2
5
10
5
2.5
300
7.5
1:10
1:3
2:1:3:3*
Würth Elektronik/Midcom
www.we-online.com
750032051
750032052
750310349
750310355
28.7
× 22 × 11.4
28.7
× 22 × 11.4
36.5
× 42 × 23
36.5
× 42 × 23
5
10
20
50
10
5
2.5
1:10
Sumida
www.sumida.com
C8117
C8119
PS07-299
PS07-300
23
× 18.6 × 10.8
32.2
× 27 × 14
32.5
× 26.5 × 13.5
32.5
× 26.5 × 13.5
5
10
20
50
10
5
2.5
1:10
TDK
www.tdk.com
DCT15EFD-U44S003
DCT20EFD-U32S003
DCT25EFD-U27S005
22.5
× 16.5 × 8.5
30
× 22 × 12
27.5
× 33 × 15.5
5
10
20
10
5
1:10
*Transformer has three secondaries where the ratio is designated as PRI:SEC1:SEC2:SEC3
RVTRANS, RVOUT and RDCM Selection
RVTRANS sets the common-mode reference voltage for
both the DCM comparator and VOUT comparator. Select
RVTRANS from Table 2 based on the transformer supply
voltage range, VTRANS, and the maximum trip voltage,
ΔVDRAIN (VDRAIN-VTRANS).
The RVTRANS pin is connected to an internal 40μA current
source. Pin current increases as the pin voltage is taken
higher than the internal 60V Zener clamp. The LT3751 can
operate from VTRANS greater than the 60V internal Zener
clamps by limiting the RVTRANS pin current to 250μA.
Operating VTRANS above 200V requires the use of resistor
dividers. Two applications are presented that operate
Table 2. Suggested RVTRANS, RVOUT, and RDCM Values
VTRANS Range
(V)
ΔVDRAIN RANGE
(V)
RVTRANS
(kΩ)
RVOUT
(kΩ)
RDCM
(kΩ)
4.75 to 55
0 to 5
5.11
2.32
4.75 to 60
2.5 to 50
25.5
11.5
5 to 80
40.2
18.2
8 to 80
8 to 160
80.6
36.5
80 to 200
2mA RVOUT
VV
TRANS –
.
55
025
VV
TRANS –
.
55
025
0.86 RVTRANS
>200
Resistor Divider Dependent
Use Resistor Divider
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