A3230EUA-T

更新时间： 2024-01-15 07:09:27

品牌	Logo	应用领域
急速微 - ALLEGRO		开关
页数	文件大小	规格书
12页	476K
描述
Chopper-Stabilized Hall-Effect Bipolar Switch

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A3230EUA-T 数据手册

A3230

Chopper-Stabilized Hall Effect Bipolar Switch

Power Derating

Example: Reliability for V_CCat T_A=150°C, package LH, using a

low-K PCB.

The device must be operated below the maximum junction

temperature of the device, T_J(max). Under certain combinations of

peak conditions, reliable operation may require derating sup-

plied power or improving the heat dissipation properties of the

application. This section presents a procedure for correlating

factors affecting operating T_J. (Thermal data is also available on

the Allegro MicroSystems Web site.)

Observe the worst-case ratings for the device, speciﬁcally:

R_θJA=228 °C/W, T_J(max)=165°C, V_CC(max)= 24 V, and

I_CC(max)= 5 mA.

Calculate the maximum allowable power level, P_D(max). First,

invert equation 3:

∆T_max= T_J(max)– T_A= 165°C–150°C = 15°C

The Package Thermal Resistance, R_θJA, is a ﬁgure of merit sum-

marizing the ability of the application and the device to dissipate

heat from the junction (die), through all paths to the ambient air.

Its primary component is the Effective Thermal Conductivity,

K, of the printed circuit board, including adjacent devices and

traces. Radiation from the die through the device case, R_θJC, is

relatively small component of R_θJA. Ambient air temperature,

T_A, and air motion are signiﬁcant external factors, damped by

overmolding.

This provides the allowable increase to T_Jresulting from internal

power dissipation. Then, invert equation 2:

P_D(max)= ∆T_max÷R_θJA=15°C÷228 °C/W=66mW

Finally, invert equation 1 with respect to voltage:

V_CC(est)= P_D(max)÷ I_CC(max)= 66mW÷5 mA=13 V

The result indicates that, at T_A, the application and device can

The effect of varying power levels (Power Dissipation, P_D), can

be estimated. The following formulas represent the fundamental

relationships used to estimate T_J, at P_D.

dissipate adequate amounts of heat at voltages ≤V_CC(est)

Compare V_CC(est)to V_CC(max). If V_CC(est)≤ V_CC(max), then reli-

able operation between V_CC(est)and V_CC(max)requires enhanced

_θJA. If V_CC(est)≥ V_CC(max), then operation between V_CC(est)and

P_D= V_IN

(1)

(2)

(3)

V_CC(max)is reliable under these conditions.

∆T = P_D

θJA

T_J= T_A+ ∆T

For example, given common conditions such as: T_A= 25°C,

V_CC= 12 V, I_CC= 1.5 mA, and R_θJA= 165 °C/W, then:

P_D= V_CC

= 12 V 1.5 mA = 18 mW

∆T = P_D

= 18 mW 165 °C/W = 3°C

θJA

T_J= T_A+ ∆T = 25°C + 3°C = 28°C

A worst-case estimate, P_D(max), represents the maximum allow-

able power level (V_CC(max), I_CC(max)), without exceeding T_J(max)

at a selected R_θJAand T_A.

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

A3230-DS

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

1...7 8 91011 12

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与A3230EUA-T相关器件

型号	品牌	描述	获取价格	数据表
A3230LLHLT	ALLEGRO	Chopper-Stabilized Hall-Effect Bipolar Switch	获取价格
A3230LLHLT-T	ALLEGRO	Chopper-Stabilized Hall-Effect Bipolar Switch	获取价格
A3230LUA	ALLEGRO	Chopper-Stabilized Hall-Effect Bipolar Switch	获取价格
A3230LUA-T	ALLEGRO	Chopper-Stabilized Hall-Effect Bipolar Switch	获取价格
A323ERW	MPD	Low Cost, Wide Input, 3W Single & Dual Output DC/DC Converters	获取价格
A323R	MPD	Compact, Regulated, 3W Single & Dual Output DC/DC Converters	获取价格

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