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參數(shù)資料
| 型號(hào)： | LHC4913 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 3A POSITIVE LOW DROP VOLTAGE REGULATOR WITH INHIBIT FUNCTION |
| 中文描述： | 第3A陽(yáng)性低的禁止功能降穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 3/6頁(yè) |
| 文件大小： | 77K |
| 代理商： | LHC4913 |
LHC4913 SERIES
3/6
APPLICATION DIAGRAM FOR REMOTE SENSINS OPERATION FOR ADJUSTABLE VERSION
FUNCTIONAL DESCRIPTION
ADJUSTABLE VERSION
The ADJUST pin shall be set at 1.225V with the
adequated fraction of V
O
generated by a resistive
divider inserted between V
O
and GND. The
ADJ-GROUND resistor value must not be greater
than 2.5 K
. For a given V
O
the following holds:
V
O
=V
ADJ
(1+R
2
/R
1
).
OVERTEMPERATURE PROTECTION OPTION
The
LHC4913
is
protected
temperature detection circuit, turning the device
“OFF” when the temperature attains 175°C. The
recovery of the ON mode occurs with a hysteresys
of 40 °C.
by
a
junction-
OVERCURRENT PROTECTION
The device is equipped with a circuit having the
purpose of limiting the maximum load current, in
order to protect the output stage against possible
overcurrent-related damages. Its threshold can be
modified externally by means of a resistor put
between the pins SH-CNTRL and V
I
.
For this characteristic, when the load current gets
close to the above threshold, the regulation is
inhibited. Thus, an excellent operation is granted
only up to 66% of preset maximum current.
SHORT CIRCUIT MONITORING / SIGNALLING
In the event of an overcurrent at the output,
voltage level of 0.4V is present at the OCM pin. In
others conditions, this voltage equals V
I
.
a
REMOTE SENSING FOR ADJ VERSION
As pointed out in the pin configuration plot, V
O
and
SENSE are not linked to each other in order to get
a regulation with a load located far away from the
chip. Under ordinary applications, the SENSE
shall be connected to both V
O1
& V
O2
. To obtain
the best performances it is recommended to be
compliant with the configuration shown in the
figure at top page.
What can degrade the regulation performances of
this configuration is the variable voltage drop
between the chip ground and the load termination
Lv.
This is brought mostly by the current Ib coming
from the output power base and going to ground
through the driver stage. The degradation amount
to (1+R
2
/R
1
) x R
W1
x I
Bmax
+ R
W2
x I
Bmax
APPLICATION INFORMATION
Recommended V
I
=12V Max, V
O
= 1.225V Min.
The device is designed to operate with any V
I
-V
O
value according to above mentioned and thermal
dissipation limits.
An input filtering capacitor of 100nF is always
mandatory.
The two V
I
pins shall always be connected in
parallel, this applies also for the four V
O
pins.
Device stability is granted in any circumstance
with a 1
μ
F output capacitor.
The device operation is guaranteed with any
Vin-Vout
dropout
under
constraints.
Although
two
embedded
mentioned
(the
overtemperature
overcurrent) ensure the L4913 integrity against
any fault load condition, it is recommended to
comply with the specified absolute maximum
ratings also in applications involving fast switching
of output currents.
To achieve this, a polyester capacitor of at least
470nF, put close to the regulator between input
and ground, improves the L4913 reliability by
the
above
thermal
protections
first
the
and
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LHC4913PDU | 3A POSITIVE LOW DROP VOLTAGE REGULATOR WITH INHIBIT FUNCTION |
| LHC7913-4 | 3 AMP NEGATIVE LOW DROP VOLTAGE REGULATOR |
| LIC01-195B | LIGHT IGNITION CIRCUIT |
| LIC01-195H | LIGHT IGNITION CIRCUIT |
| LIC01-215B | LIGHT IGNITION CIRCUIT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LHC4913PDU | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3A POSITIVE LOW DROP VOLTAGE REGULATOR WITH INHIBIT FUNCTION |
| LHC5128A | 制造商:BLACK BOX 功能描述:MATCHED MEDIA CONVERTER SET STAND-ALONE |
| LHC5129A-R3 | 制造商:Black Box Corporation 功能描述:STAND-ALONE TX/SSFX SM SC(1310XMT/1550 RCV) |
| LHC5129A-R3-W1 | 制造商:Black Box Corporation 功能描述:1 YEAR WARRANTY FOR LHC5129A-R3 |
| LHC5129A-R3-W3 | 制造商:Black Box Corporation 功能描述:3 YEAR WARRANTY FOR LHC5129A-R3 |
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