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| 型号： | LX8386-00IP |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | TRANS PREBIASED NPN 200MW SOT23 |
| 中文描述： | 1.2 V-8 V ADJUSTABLE POSITIVE LDO REGULATOR, 1.5 V DROPOUT, PSFM3 |
| 封装： | PLASTIC, TO-220, 3 PIN |
| 文件页数： | 5/7页 |
| 文件大小： | 223K |
| 代理商： | LX8386-00IP |
1.5A L
OW
D
ROPOUT
P
OSITIVE
R
E G U L AT O R S
LX8386-xx/8386A-xx/8386B-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 1999
Rev. 1.7a 10/00
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
LX8386/86A/86B
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 LX8386
/86A/86B
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 LX8386
/86A/86B
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
.
LX8386/86A/86B
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
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相关代理商/技术参数 |
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| LX8386-33 | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:1.5 A LOW DROPOUT POSITIVE REGULATORS |
| LX8386-33CDD | 功能描述:IC REG LDO 3.3V 1.5A TO263 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式和可调式 输出电压:3.3V，1.25 V ~ 5.7 V 输入电压:4.5 V ~ 7 V 电压 - 压降（标准）:1.1V @ 1A 稳压器数量:2 电流 - 输出:1A 电流 - 限制（最小）:1A 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-5，DPak（4 引线 + 接片），TO-252AD 供应商设备封装:PPAK 包装:管件 其它名称:497-3576-5 |
| LX8386-33CDDT | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:Positive Fixed Voltage Regulator |
| LX8386-33CDL | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Fixed Voltage Regulator |
| LX8386-33CDLT | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Fixed Voltage Regulator |
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