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參數(shù)資料
| 型號： | ZXCL1200H5 |
| 廠商： | ZETEX PLC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Circular Connector; MIL SPEC:MIL-C-26482, Series I; Body Material:Aluminum Alloy; Series:MS3126; Number of Contacts:12; Connector Shell Size:14; Connecting Termination:Crimp; Circular Shell Style:Straight Plug |
| 中文描述： | 2 V FIXED POSITIVE LDO REGULATOR, PDSO5 |
| 封裝： | 2.10 X 2 MM, SC-70, 5 PIN |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 571K |
| 代理商： | ZXCL1200H5 |
Input to Output Diode
In common with many other regulators, the ZXCL200
device has an inherent diode associated with the
output series pass transistor. This diode has its anode
connected to the output and its cathode to the input.
The internal diode is normally reverse biased, but will
conduct if the output is forced above the input by more
than a V
BE
(approximately 0.6V). Current will then flow
from Vout to Vin. For safe operation, the maximum
current in this diode should be limited to 5mA
continuousand30mApeak.Anexternalschottkydiode
may be used to provide protection when this condition
cannot be satisfied.
Increased Output current
Any ZXCL series device may be used in conjunction
with an external PNP transistor to boost the output
current capability. In the application circuit
below, a FMMT717 device is employed as the external
passelement.ThisSOT23devicecansupplyupto2.5A
maximum current subject to the thermal dissipation
limits of the package (625mW). Alternative devices
may be used to supply higher levels of current. Note
that with this arrangement, the dropout voltage will be
increased by the VBE drop of the external device. Also,
care should be taken to protect the pass transistor in
the event of excessive output current.
shown
ZXCL200
ISSUE 1 - SEPTEMBER 2001
6
VIN
EN
G
VO
U1
ZXCL SERIES
Q1
FMMT717
R1
5.6R
C2
1uF
C1
1uF
C3
1uF
VOUT
VIN
Scheme to boost output current to 2A
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