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參數(shù)資料
| 型號： | SC4808C |
| 廠商： | Semtech Corporation |
| 英文描述： | High Performance Dual Ended PWM Controller |
| 中文描述： | 高性能雙端PWM控制器 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 395K |
| 代理商： | SC4808C |
13
2006 Semtech Corp.
www.semtech.com
SC4808C
POWER MANAGEMENT
Application Information (Cont.)
Below the benefits from the slope compensation become apparent. The top wave form shows the stable operation
before the perturbation. The second wave form shows the perturbation and the instability caused from it if no slope
compensation is added to the current information. The last wave form shows the slope compensation and the effect of
it. The increase in the slope of the current information results in an early termination of the inductor current, hence a
reduction in the amount of error. As the cycle is repeated, the perturbation is reduced and finally eliminated.
Stable current mode operation with Slope
Compensation
I
L
I
Sense
I
CS
: Inductor current
: Small Inductor current perturbation
I
L
D>50%
i
L
δ
: Sensed Mosfet current
I
Sense
i
L
δ
i
L
δ
Stable operation
( no perturbation)
Instable operation
( with perturbation)
Stable operation
(Slope Compensation Added)
I
L
I
Sense
I
L
I
CS
Error Signal from Error amplifier
Error Signal from Error amplifier
: Summation of Isense and slope compensation, at the CS pin of the SC4808.
Error Signal from Error amplifier
Note: After a few cycles the perturbation
disappears and stable operation returns.
Note: After a few cycles the perturbation
becomes larger, and causes instability.
相關(guān)PDF資料 |
PDF描述 |
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| SC4808CMSTRT | High Performance Dual Ended PWM Controller |
| SC4809A | High Performance Current Mode PWM Controller |
| SC4809B | High Performance Current Mode PWM Controller |
| SC4809C | High Performance Current Mode PWM Controller |
| SC480 | Complete DDR1/2/3 Memory Power Supply |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC4808CMSTRT | 制造商:Semtech Corporation 功能描述:SC Series 20 mA 550 kHz SMT High Performance Dual Ended PWM Controller - MSOP-10 |
| SC4809A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Current Mode PWM Controller |
| SC4809AIMSTR | 制造商:Semtech Corporation 功能描述:IC, CURRENT MODE PWM CTRL, 12V, MSOP-10; Output Voltage:500mV; Output Current:1mA; Supply Voltage Min:0V; Supply Voltage Max:12V; Digital IC Case Style:MSOP; No. of Pins:10; Frequency:1MHz; Operating Temperature Min:-40C ;RoHS Compliant: No |
| SC4809AIMSTRT | 制造商:Semtech Corporation 功能描述:Current Mode PWM Controller 10-Pin MSOP T/R 制造商:Semtech Corporation 功能描述:Pulse Width Modulation (PWM) Controller |
| SC4809B | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Current Mode PWM Controller |
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