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LT3751EUFD 数据表(PDF) 17 Page - Linear Technology

部件名 LT3751EUFD
功能描述  Capacitor Charger Controller with Regulation
PDF  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT3751EUFD 数据表(HTML) 17 Page - Linear Technology

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LT3751
17
3751f
Figure 9. Maximum Switching Frequency
PEAK PRIMARY CURRENT (A)
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
17.4
× 24.1 × 10.2
20.6
× 30 × 11.3
32.65
× 26.75 × 14
32.65
× 26.75 × 14
5
10
20
50
10
10
5
2.5
1:10
1:10
1:10
1:10
Midcom
www.midcom.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
10
5
2.5
1:10
1:10
1:10
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
10
5
2.5
1:10
1:10
1:10
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
10
5
1:10
1:10
1:10
Figure 9 defines the maximum boundary-mode switching
frequency when operating at a desired output power level
and is normalized to LPRI/POUT (μH/Watt). The relation-
ship of output power, boundary-mode frequency, IPK, and
primary inductance can be used as a guide throughout
the design process.
RVTRANS & RDCM Selection
RVTRANS sets the common-mode reference voltage for
both the DCM comparator and VOUT comparator. Select
RVTRANS from the design guide in Figure 10.
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. Choose 25k for
VTRANS voltage below 12V. Choose 40k for VTRANS voltage
between 12V and 60V. For VTRANS voltage greater than
60V, choose RVTRANS to limit RVTRANS pin voltage to less
than 60V (i.e. 55V).
RVTRANS =
VTRANS –55V
40
μA
RDCM needs to be properly designed in relation to RVTRANS.
Improper selection of RDCM can lead to undesired switch-
ing operation at low output voltages.
RDCM = 0.45 •RVTRANS
Figure 10. Suggested RVTRANS Resistance
3751 F10
150k
125k
50k
75k
100k
25k
10
20
30
40
VTRANS (V)
50
60
80
70
SUGGESTED
RVTRANS
RESISTANCE



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