 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LM3488MMX Datasheet(PDF) 11 Page - National Semiconductor (TI) |
|
|
||||||||||||||||||||||||||||||
LM3488MMX Datasheet(HTML) 11 Page - National Semiconductor (TI) |
|
|
11 / 24 page  Functional Description (Continued) SLOPE COMPENSATION RAMP The LM3488 uses a current mode control scheme. The main advantages of current mode control are inherent cycle-by- cycle current limit for the switch, and simpler control loop characteristics. It is also easy to parallel power stages using current mode control since as current sharing is automatic. Current mode control has an inherent instability for duty cycles greater than 50%, as shown in Figure 2.In Figure 2, a small increase in the load current causes the switch cur- rent to increase by ∆I O. The effect of this load change, ∆I 1,is : From the above equation, when D > 0.5, ∆I 1 will be greater than ∆I O. In other words, the disturbance is divergent. So a very small perturbation in the load will cause the disturbance to increase. To prevent the sub-harmonic oscillations, a compensation ramp is added to the control signal, as shown in Figure 3. With the compensation ramp, 10138807 FIGURE 1. Basic Operation of the PWM comparator 10138809 FIGURE 2. Sub-Harmonic Oscillation for D>0.5 www.national.com 11 |
Similar Part No. - LM3488MMX |
|
Similar Description - LM3488MMX |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | 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
