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參數資料
| 型號： | L6920DBTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | LEAD FREE, MSOP-8 |
| 文件頁數： | 16/16頁 |
| 文件大小： | 402K |
| 代理商： | L6920DBTR |
L6920DB
Detailed description
9/16
Considering that current in the inductor is limited to 800mA, the maximum load current is
defined by the following relationship:
Equation 1
Where
ηis the efficiency and ILIM = 750mA
Figure 8.
No regulation C2 = Vout ; C3 = Inductor Current
5.2
Start-up
One of the key features of L6920DB 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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