AME1085

更新时间： 2024-01-17 02:26:53

品牌	Logo	应用领域
安茂微 - AME		稳压器
页数	文件大小	规格书
14页	106K
描述
3A Low Dropout Positive Voltage Regulator

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数据手册

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AME1085 技术参数

生命周期：	Contact Manufacturer	包装说明：	,
Reach Compliance Code：	compliant	风险等级：	5.59
Base Number Matches：	1

AME1085 数据手册

Analog Microelectronics, Inc.

3A Low Dropout

Positive Voltage Regulator

AME1085

3. Current limit protection

n Application Description

AME1085 is protected against overload condi-

tions. Current protection is triggered at typi-

cally 4.5A.

1. Output voltage adjustment

Like most regulators, the AME1085 regulates the

output by comparing the output voltage to an

internally generated reference voltage. On the

adjustable version, the VREF is available exter-

nally as 1.25V between V_OUTand ADJ. The

voltage ratio formed by R1 and R2 should be

4. Stability and load regulation

AME1085 requires a capacitor from VOUT to

GND to provide compensation feedback to the

internal gain stage. This is to ensure stability

at the output terminal. Typically, a 10µF tanta-

lum or 50µF aluminum electrolytic is sufficient.

set

to conduct 10mA (minimum output load).

The output voltage is given by the following

equation:

Note: It is important that the ESR for this ca-

pacitor does not exceed 0.5Ω.

V_OUT= V_REF( 1 +

) + I_ADJx R2

On fixed versions of AME1085, the voltage di-

vider is provided internally.

The output capacitor dose not have a theoreti-

cal upper limit and increasing its value will in-

creasestability. COUT = 100µF or more is typi-

cal for high current regulator design.

For the adjustable version, the best load regu-

lation is accomplished when the top of the

resistor divider (R1) is connected directly to the

output pin of the AME1085. When so con-

nected, R_Pis not multiplied by the divider ratio.

For fixed output versions, the top of R1 is in-

ternally connected to the output and ground

pin can be connected to low side of the load.

V_OUT

V_IN

OUT

ADJ

C₁

V_REF

I_ADJ

) + I_ADJx R2

V_OUT= V_REF(1+

R_P

Parasitic

Line Resistance

V_IN

OUT

Figure 3

ADJ

2. Thermal protection

R_L

AME1085 has thermal protection which limits

junction temperature to 150^OC. However, de-

vice functionality is only guaranteed to a maxi-

mum junction temperature of +125^OC.

(Connect R1 to case)

The power dissipation and junction temperature

for AME1085 in TO-220 package are given by

P_D= (V_IN- V_OUT) x I_OUT

T_JUNCTION= T_AMBIENT+ ( P_Dx θ_JA)

Connect

R2 to load

Note: T_JUNCTIONmust not exceed 125^OC

Figure 4

1 2 3 456 7 8...14

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