LT8300E Просмотр технического описания (PDF) - Analog Devices
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LT8300E Datasheet PDF : 24 Pages
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LT8300
APPLICATIONS INFORMATION
In general, choose a transformer with its primary mag-
netizing inductance about 20% to 40% larger than the
minimum values calculated above. A transformer with
much larger inductance will have a bigger physical size
and may cause instability at light load.
Selecting a Transformer
Transformer specification and design is perhaps the most
critical part of successfully applying the LT8300. In addi-
tion to the usual list of guidelines dealing with high fre-
quency isolated power supply transformer design, the
following information should be carefully considered.
Linear Technology has worked with several leading mag-
netic component manufacturers to produce pre-designed
flyback transformers for use with the LT8300. Table 1
shows the details of these transformers.
Turns Ratio
Note that when choosing the RFB resistor to set output
voltage, the user has relative freedom in selecting a trans-
former turns ratio to suit a given application. In contrast,
the use of simple ratios of small integers, e.g., 4:1, 2:1,
1:1, provides more freedom in settling total turns and
mutual inductance.
Table 5. Predesigned Transformers — Typical Specifications
TRANSFORMER
PART NUMBER
LPRI
LLEAKAGE
(µH)
(µH) NP:NS:NB
VENDOR
750312367
400
4.5
8:1
Wurth Elektronik
750312557
300
2.5
6:1
Wurth Elektronik
750312365
750312558
300
1.8
4:1
Wurth Elektronik
300
1.75
2:1:1
Wurth Elektronik
750312559
750311019
300
2
1:1
Wurth Elektronik
400
5
6:1:2
Wurth Elektronik
750311558
750311660
300
1.5
4:1:1
Wurth Elektronik
350
3
2:1:0.33 Wurth Elektronik
750311838
350
3
2:1:1
Wurth Elektronik
750311659
10396-T026
300
2
1:1:0.2 Wurth Elektronik
300
2.5
6:1:2
Sumida
10396-T024
10396-T022
300
2
4:1:1
Sumida
300
2
2:1:0.33
Sumida
10396-T028
300
2.5
2:1:1
Sumida
L10-0116
500
7.3
6:1
BH Electronics
L10-0112
230
3.38
4:1
L11-0067
230
2.16
4:1
* All the transformers are rated for 1.5kV Isolation.
BH Electronics
BH Electronics
TARGET APPLICATIONS
48V to 3.3V/0.51A, 24V to 3.3V/0.37A, 12V to 3.3V/0.24A
48V to 3.3V/0.42A, 24V to 3.3V/0.32A, 12V to 3.3V/0.22A
48V to 5V/0.38A, 24V to 5V/0.27A, 12V to 5V/0.17A
48V to 5V/0.29A, 24V to 5V/0.22A, 12V to 5V/0.15A
48V to ±12V/67mA, 24V to ±12V/50mA, 12V to ±12V/33mA
48V to ±15V/62mA, 24V to ±15V/44mA, 12V to ±15V/28mA
48V to 24V/67mA, 24V to 24V/50mA, 12V to 24V/33mA
48V to 3.3V/0.42A, 24V to 3.3V/0.32A, 12V to 3.3V/0.22A
48V to 5V/0.38A, 24V to 5V/0.27A, 12V to 5V/0.17A
48V to 5V/0.29A, 24V to 5V/0.22A, 12V to 5V/0.15A
48V to 12V/0.134A, 24V to 12V/0.1A, 12V to 12V/0.066A
48V to 15V/0.124A, 24V to 15V/0.088A, 12V to 15V/0.056A
48V to ±12V/67mA, 24V to ±12V/50mA, 12V to ±12V/33mA
48V to ±15V/62mA, 24V to ±15V/44mA, 12V to ±15V/28mA
48V to 24V/67mA, 24V to 24V/50mA, 12V to 24V/33mA
48V to 3.3V/0.42A, 24V to 3.3V/0.32A, 12V to 3.3V/0.22A
48V to 5V/0.38A, 24V to 5V/0.27A, 12V to 5V/0.17A
48V to 5V/0.29A, 24V to 5V/0.22A, 12V to 5V/0.15A
48V to 12V/0.134A, 24V to 12V/0.1A, 12V to 12V/0.066A
48V to 15V/0.124A, 24V to 15V/0.088A, 12V to 15V/0.056A
48V to ±12V/67mA, 24V to ±12V/50mA, 12V to ±12V/33mA
48V to ±15V/62mA, 24V to ±15V/44mA, 12V to ±15V/28mA
48V to 3.3V/0.42A, 24V to 3.3V/0.32A, 12V to 3.3V/0.22A
48V to 5V/0.38A, 24V to 5V/0.27A, 12V to 5V/0.17A
48V to 5V/0.29A, 24V to 5V/0.22A, 12V to 5V/0.15A
48V to 5V/0.29A, 24V to 5V/0.22A, 12V to 5V/0.15A
For more information www.analog.com
Rev. A
11
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