 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LTC3703 Datasheet(PDF) 21 Page - Linear Technology |
|
|
|||||||||||||||||||||||||||||
LTC3703 Datasheet(HTML) 21 Page - Linear Technology |
|
|
21 / 32 page  LTC3703 21 3703f TYPE 2 Loop: TYPE 3 Loop: APPLICATIO S I FOR ATIO section. An example of a boost converter circuit is shown in the Typical Applications section. To operate the LTC3703 in boost mode, the INV pin should be tied to the VCC voltage (or a voltage above 2V). Note that in boost mode, pulse-skip operation and the line feedforward compensa- tion are disabled. For a boost converter, the duty cycle of the main switch is: D VV V OUT IN OUT = – For high VOUT to VIN ratios, the maximum VOUT is limited by the LTC3703’s maximum duty cycle which is typically 93%. The maximum output voltage is therefore: V V D V OUT MAX IN MIN MAX IN MIN () () () – =≅ 1 14 Boost Converter: Inductor Selection In a boost converter, the average inductor current equals the average input current. Thus, the maximum average inductor current can be calculated from: I I D I V V LMAX OMAX MAX OMAX O IN MIN () () () () • = − = 1 Similar to a buck converter, choose the ripple current to be 20% to 40% of IL(MAX). The ripple current amplitude then determines the inductor value as follows: L V If D IN MIN L MAX = ∆ () • • The minimum required saturation current for the inductor is: IL(SAT) > IL(MAX) + ∆IL/2 Boost Converter: Power MOSFET Selection For information about choosing power MOSFETs for a boost converter, see the Power MOSFET Selection section for the buck converter, since MOSFET selection is similar. However, note that the power dissipation equations for the MOSFETs at maximum output current in a boost converter are: K BOOST C fG K R CC K R K fC R VR VV B REF OUT REF =+ ° = =− () = = − tan •• • • •• () 2 45 2 1 21 12 1 2 21 1 2 π π K BOOST C fG R CC K R K fC R R K C fK R R VR VV B REF OUT REF =+ ° = =− () = = − = = − tan •• • •• • () 2 4 45 2 1 21 12 1 2 21 3 1 1 3 1 23 1 π π π Boost Converter Design The following sections discuss the use of the LTC3703 as a step-up (boost) converter. In boost mode, the LTC3703 can step-up output voltages as high as 80V. These sec- tions discuss only the design steps specific to a boost converter. For the design steps common to both a buck and a boost, see the applicable section in the buck mode |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
