LTM8002 datasheet(14/26 Pages) LINER

14 / 26 page

LTM8065

8065fa

For more information www.linear.com/LTM8065

For most applications, the design process is straight-

forward, summarized as follows:

1. Look at Table 1 and find the row that has the desired

input range and output voltage.

2. Apply the recommended,CIN,COUT,RFBandRTvalues.

3. Apply the CFF (from AUX to FB) as required.

4. Connect BIAS as indicated.

While these component combinations have been tested

for proper operation, it is incumbent upon the user to

verify proper operation over the intended system’s line,

load and environmental conditions. Bear in mind that the

maximum output current is limited by junction tempera-

ture, the relationship between the input and output voltage

magnitude and polarity and other factors. Please refer to

the graphs in the Typical Performance Characteristics

section for guidance.

APPLICATIONS INFORMATION

The maximum frequency (and attendant RT value) at

which the LTM8065 should be allowed to switch is given

in Table 1 in the Maximum fSW column, while the recom-

mended frequency (and RT value) for optimal efficiency

over the given input condition is given in the fSW column.

There are additional conditions that must be satisfied if

the synchronization function is used. Please refer to the

Synchronization section for details.

Capacitor Selection Considerations

The CIN and COUT capacitor values in Table 1 are the

minimum recommended values for the associated oper-

ating conditions. Applying capacitor values below those

indicated in Table 1 is not recommended and may result

in undesirable operation. Using larger values is generally

acceptable, and can yield improved dynamic response, if

it is necessary. Again, it is incumbent upon the user to

Table 1. Recommended Component Values and Configuration (TA = 25°C)

VIN

VOUT

RFB

CIN2

COUT

CFF

BIAS

fSW

MAX fSW

MIN RT

3.4V to 40V

0.97V

open

2.2µF 50V 0805

100µF 4V 0805

47pF

450kHz

100k

660kHz

63.4k

3.4V to 40V

1.2V

1.05M

2.2µF 50V 0805

100µF 4V 0805

47pF

550kHz

78.7k

900kHz

45.3k

3.4V to 40V

1.5V

464k

2.2µF 50V 0805

100µF 4V 0805

27pF

650kHz

64.9k

1MHz

41.2k

3.4V to 40V

1.8V

294k

2.2µF 50V 0805

100µF 4V 0805

10pF

700kHz

60.4k

1.3MHz

28.7k

3.4V to 40V

237k

2.2µF 50V 0805

100µF 4V 0805

850kHz

51.5k

1.4MHz

28.0k

3.5V to 40V1

2.5V

158k

2.2µF 50V 0805

47µF 4V 0805

900kHz

45.3k

1.7MHz

21.5k

4.5V to 40V1

3.3V

102k

2.2µF 50V 0805

47µF 4V 0805

900kHz

45.3k

2.2MHz

15.8k

6.5V to 40V1

60.4k

2.2µF 50V 0805

22µF 6.3V 0805

1MHz

41.2k

3MHz

10.7k

10V to 40V1

34k

2.2µF 50V 0805

22µF 10V 1206

1.3MHz

28.7k

3MHz

10.7k

14.5V to 40V1

12V

21.5k

4.7µF 50V 0805

10µF 16V 0805

1.3MHz

28.7k

3MHz

10.7k

19.5V to 40V1

15V

16.9k

4.7µF 50V 0805

10µF 16V 0805

1.5MHz

25.5k

3MHz

10.7k

23V to 40V1

18V

14k

4.7µF 50V 0805

10µF 25V 1206

1.8MHz

20.5k

3MHz

10.7k

3.4V to 36V1

–3.3V

102k

2.2µF 50V 0805

47µF 4V 0805

LTM8065 GND

900kHz

45.3k

2.2MHz

15.8k

3.4V to 35V1

–5V

59k

2.2µF 50V 0805

22µF 6.3V 0805

LTM8065 GND

1MHz

41.2k

3MHz

10.7k

3.4V to 32V1

–8V

34k

2.2µF 50V 0805

22µF 10V 1206

LTM8065 GND

1.3MHz

28.7k

3MHz

10.7k

3.4V to 28V1

–12V

21.5k

4.7µF 50V 0805

10µF 16V 0805

LTM8065 GND

1.3MHz

28.7k

3MHz

10.7k

3.4V to 25V1

–15V

16.9k

4.7µF 50V 0805

10µF 16V 0805

LTM8065 GND

1.5MHz

25.5k

3MHz

10.7k

3.4V to 22V1

–18V

14k

4.7µF 50V 0805

10µF 25V 1206

LTM8065 GND

1.8MHz

20.5k

3MHz

10.7k

1. The LTM8065 may be capable of lower input voltages but may skip off cycles.

2. An input bulk capacitor is required

LTM8002 датащи(PDF) 14 Page - Linear Technology

LTM8002 датащи(HTML) 14 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

датащи скачать

ссылки URL