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參數資料
| 型號： | L6920DCTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | LEAD FREE, MSOP-8 |
| 文件頁數： | 16/16頁 |
| 文件大小： | 401K |
| 代理商： | L6920DCTR |
L6920DC
Detailed description
9/16
The maximum load current is defined by the following relationship:
Equation 1
Where
ηis the efficiency and ILIM is the current limit.
Figure 8.
No regulation C2 = Vout ; C3 = Inductor Current
5.2
Start-up
One of the key features of L6920DC is the startup at supply voltage down to 0.8V (please
see the diagram in Figure 4).
The device leaves the startup mode of operation as soon as Vout goes over 1.4V. During
startup, the synchronous switch is off and the energy is transferred to the load through its
intrinsic body diode.
The N-channel switches with a very low RDS(on) thanks to an internal charge pump used to
bias the power MOS gate. Because of this modified behavior, TON/TOFF times are
lengthened. Current limit and zero crossing detection are still available.
I
LOAD_LIM
V
in
V
out
-----------
I
LIM
T
OFF_MIN
V
out
V
in
–
2L
-------------------------
–
η
=
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