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參數(shù)資料
| 型號(hào)： | LX8382A-00 |
| 廠商： | Microsemi Corporation |
| 英文描述： | 10 A LOW DROPOUT POSITIV E REGULATORS |
| 中文描述： | 10低壓降POSITIV位置調(diào)節(jié)器 |
| 文件頁(yè)數(shù)： | 5/7頁(yè) |
| 文件大?。?/td> | 200K |
| 代理商： | LX8382A-00 |
10A L
O W
D
R O P O U T
P
O S I T I V E
R
E G U L AT O R S
LX8382-xx
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
5
Copyright 1997
Rev. 1.0 8/97
P
R O D U C T I O N
D
A T A
S
H E E T
A P P L I C AT I O N N O T E S
FIGURE 2
— BASIC ADJUSTABLE REGULATOR
R2+R1
R1
LX8382/82A-xx
IN
ADJ
OUT
V
OUT
V
IN
R1
R2
V
REF
I
50μA
V
OUT
= V
REF
1 + R1
ADJ
R2
OVERLOAD RECOVERY
(continued)
If this limited current is not sufficient to develop the designed
voltage across the output resistor, the voltage will stabilize at some
lower value, and will
never
reach the designed value. Under these
circumstances, it may be necessary to cycle the input voltage
down to zero in order to make the regulator output voltage return
to regulation.
RIPPLE REJECTION
Ripple rejection can be improved by connecting a capacitor
between the ADJ pin and ground. The value of the capacitor should
be chosen so that the impedance of the capacitor is equal in
magnitude to the resistance of R1
at the ripple frequency
. The
capacitor value can be determined by using this equation:
C = 1 / (6.28 * F
R
* R1)
where: C
≡
the value of the capacitor in Farads;
select an equal or larger standard value.
≡
the ripple frequency in Hz
≡
the value of resistor R1 in ohms
F
R
R1
At a ripple frequency of 120Hz, with R1 = 100
:
C = 1 / (6.28 * 120Hz * 100
) = 13.3μF
The closest equal or larger standard value should be used, in this
case, 15μF.
When an ADJ pin bypass capacitor is used, output ripple
amplitude will be essentially independent of the output voltage. If
an ADJ pin bypass capacitor is not used, output ripple will be
proportional to the ratio of the output voltage to the reference
voltage:
M = V
OUT
/V
REF
where: M
≡
a multiplier for the ripple seen when the
ADJ pin is optimally bypassed.
V
REF
= 1.25V.
For example, if V
OUT
= 2.5V the output ripple will be:
M = 2.5V/1.25V= 2
Output ripple will be twice as bad as it would be if the ADJ pin
were to be bypassed to ground with a properly selected capacitor.
OUTPUT VOLTAGE
The LX8382/82A ICs develop a 1.25V reference voltage between the
output and the adjust terminal (See Figure 2). By placing a resistor, R1,
between these two terminals, a constant current is caused to flow
through R1 and down through R2 to set the overall output voltage.
Normally this current is the specified minimum load current of 10mA.
Because I
is very small and constant when compared with the current
through R1, it represents a small error and can usually be ignored.
LOAD REGULATION
Because the LX8382/82A regulators are three-terminal devices, it
is not possible to provide true remote load sensing. Load
regulation will be limited by the resistance of the wire connecting
the regulator to the load. The data sheet specification for load
regulation is measured at the bottom of the package. Negative
side sensing is a true Kelvin connection, with the bottom of the
output divider returned to the negative side of the load. Although
it may not be immediately obvious, best load regulation is
obtained when the top of the resistor divider, (R1), is connected
directly
to the case of the regulator,
not to the load
. This is
illustrated in Figure 3. If R1 were connected to the load, the
effective resistance between the regulator and the load would be:
R
Peff
= R
P
*
where: R
P
≡
Actual parasitic line resistance.
When the circuit is connected as shown in Figure 3, the parasitic
resistance appears as its actual value, rather than the higher R
Peff
.
LX8382/82A-xx
IN
ADJ
OUT
V
IN
R1
R2
R
L
R
Parasitic
Line Resistance
Connect
R1 to Case
of Regulator
Connect
R2
to Load
FIGURE 3
— CONNECTIONS FOR BEST LOAD REGULATION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LX8382A-00CP | 10 A LOW DROPOUT POSITIV E REGULATORS |
| LX8382A-00CV | 10 A LOW DROPOUT POSITIV E REGULATORS |
| LX8382A-33 | 10 A LOW DROPOUT POSITIV E REGULATORS |
| LX8382A-33CP | 10 A LOW DROPOUT POSITIV E REGULATORS |
| LX8382-33 | 10 A LOW DROPOUT POSITIV E REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX8382A-00CP | 功能描述:IC REG LDO ADJ 10A TO220 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式和可調(diào)式 輸出電壓:3.3V，1.25 V ~ 5.7 V 輸入電壓:4.5 V ~ 7 V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 1A 穩(wěn)壓器數(shù)量:2 電流 - 輸出:1A 電流 - 限制（最?。?1A 工作溫度:0°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:TO-252-5，DPak（4 引線 + 接片），TO-252AD 供應(yīng)商設(shè)備封裝:PPAK 包裝:管件 其它名稱(chēng):497-3576-5 |
| LX8382A-00CV | 功能描述:IC REG LDO ADJ 10A TO247 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式和可調(diào)式 輸出電壓:3.3V，1.25 V ~ 5.7 V 輸入電壓:4.5 V ~ 7 V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 1A 穩(wěn)壓器數(shù)量:2 電流 - 輸出:1A 電流 - 限制（最?。?1A 工作溫度:0°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:TO-252-5，DPak（4 引線 + 接片），TO-252AD 供應(yīng)商設(shè)備封裝:PPAK 包裝:管件 其它名稱(chēng):497-3576-5 |
| LX8382A-33 | 制造商:MICROSEMI 制造商全稱(chēng):Microsemi Corporation 功能描述:10 A LOW DROPOUT POSITIV E REGULATORS |
| LX8382A-33CP | 功能描述:IC REG LDO 3.3V 10A TO220 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式和可調(diào)式 輸出電壓:3.3V，1.25 V ~ 5.7 V 輸入電壓:4.5 V ~ 7 V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 1A 穩(wěn)壓器數(shù)量:2 電流 - 輸出:1A 電流 - 限制（最?。?1A 工作溫度:0°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:TO-252-5，DPak（4 引線 + 接片），TO-252AD 供應(yīng)商設(shè)備封裝:PPAK 包裝:管件 其它名稱(chēng):497-3576-5 |
| LX8382A-33CV | 功能描述:IC REG LDO 3.3V 10A TO247 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式和可調(diào)式 輸出電壓:3.3V，1.25 V ~ 5.7 V 輸入電壓:4.5 V ~ 7 V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 1A 穩(wěn)壓器數(shù)量:2 電流 - 輸出:1A 電流 - 限制（最?。?1A 工作溫度:0°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:TO-252-5，DPak（4 引線 + 接片），TO-252AD 供應(yīng)商設(shè)備封裝:PPAK 包裝:管件 其它名稱(chēng):497-3576-5 |
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