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| 型号： | TLE6389GVT |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 420 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | PLASTIC, DSO-14 |
| 文件页数： | 22/37页 |
| 文件大小： | 368K |
| 代理商： | TLE6389GVT |
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TLE 6389
Preliminary data sheet Rev. 1.0
29
2003-05-05
Figure 4
Reset timing
The reset delay time can be calculated with the following:
where CRD is the value of the delay capacitance, VRD,UT the upper reset timing threshold
and IRD, ch the reset delay charging current.
7.7
100% duty-cycle operation and dropout
The TLE6389 operates with a duty cycle up to 100%. This feature allows to operate with
the lowest possible drop voltage at low battery voltage as it occurs at cold cranking. The
MOSFET is turned on continuously when the supply voltage approaches the output
voltage level, conventional switching regulators with less than 100% duty cycle would fail
in that case.
The drop- or dropout voltage is defined as the difference between the input and output
voltage levels when the input is low enough to drop the output out of regulation. Dropout
t
V
VOUT, RT
V
FB,RT
t
rr
< t
rr
t
rd
thermal
shutdown
under
voltage
over
load
t
rd
t
rd
t
rd
V
RD, UT
V
RD, LT
V
IN
V
VOUT
V
FB
V
RD
V
RO
t
rd
V
RD U T
,
I
RD ch
,
-------------------- C
RD
=
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