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| 型號(hào)： | RP502L081B-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 3960 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 1.60 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6 |
| 文件頁(yè)數(shù)： | 5/30頁(yè) |
| 文件大?。?/td> | 1222K |
| 代理商： | RP502L081B-TR |
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RP502x
13
Discontinuous mode and Continuous mode
As the following diagram shows, when the output current (IOUT) is relatively small, topen will be smaller than
toff (topen < toff). In this case, the all energy charged in the inductor during the time period of ton will be
discharged during the time period of toff. As a result, IL will be ILmin (=0). If IOUT is gradually increased,
eventually topen will be equal to toff (topen=toff). If IOUT is further increased, ILmin will be larger than zero
(ILmin>0). The former mode (topen<toff) is referred to as “discontinuous mode” and the latter mode (topen=toff)
is referred to as “continuous mode”.
Discontinuous mode
Continuous mode
ILmax
ILmin
ton
toff
T=1/fosc
topen
IL
t
ILmax
ILmin
ton
toff
T=1/fosc
IL
Iconst
t
In the continuous mode, solve the equation 1 for ton, and assume that the solution is tonc.
tonc = T x VOUT / VIN ..................................................................................................... Equation 2
If ton is smaller than tonc (ton<tonc), it is discontinuous mode. If ton is equal to tonc (ton=tonc), it is continuous
mode.
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