A3250LLT-T

更新时间： 2024-02-24 22:06:24

品牌	Logo	应用领域
急速微 - ALLEGRO		开关
页数	文件大小	规格书
15页	354K
描述
Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect Switches

阅读下载

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

A3250LLT-T 数据手册

Field-Programmable, Chopper-Stabilized,

Unipolar Hall-Effect Switches

A3250 and

A3251

Power Derating

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

minimum-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=165°C/W, T_J(max)=165°C, V_CC(max)= 24 V, and

I_CC(max)= 10 mA.

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

invert equation 3:

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.

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

This provides the allowable increase to T_Jresulting from internal

power dissipation. Then, invert equation 2:

P_D(max)= ΔT_max÷R_θJA=15°C÷165 °C/W=91mW

Finally, invert equation 1 with respect to voltage:

V_CC(est)= P_D(max)÷ I_CC(max)= 91mW÷10mA=9 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

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

V_CC(max)is reliable under these conditions.

P_D= V_IN

(1)

ΔT = P_D

(2)

θJA

T_J= T_A+ ΔT

(3)

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

V_CC= 12 V, I_CC= 4 mA, and R_θJA= 165 °C/W, then:

P_D= V_CC

= 12 V 4 mA = 48 mW

ΔT = P_D

= 48 mW 165 °C/W = 8°C

θJA

T_J= T_A+ ΔT = 25°C + 8°C = 33°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

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

www.allegromicro.com

1...10 11 121314 15

下载PDF

与A3250LLT-T相关器件

型号	品牌	描述	获取价格	数据表
A3250LLTTR	ALLEGRO	Analog Circuit, 1 Func, PSSO3, TO-243AA, SOT-89, 3 PIN	获取价格
A3250LLTTR-T	ALLEGRO	Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect Switches	获取价格
A3250LUA	ALLEGRO	Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect Switches	获取价格
A3250LUA	SANKEN	Analog Circuit, 1 Func, PSIP3	获取价格
A3250LUA-LC	ALLEGRO	Analog Circuit, 1 Func, PSIP3, ULTRA MINI, SIP-3	获取价格
A3250LUA-T	ALLEGRO	Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect Switches	获取价格

与A3250LLT-T相关文章

SG3525资料手册详解：SG3525参数分析、引脚说明、应用介绍
2024-05-23

2
AT89C51单片机资料手册详细解析及应用示例
2024-05-23

5
CP2102资料手册解读：CP2102引脚说明、关键参数分析
2024-05-23

3
资料手册解读：UC3842参数和管脚说明
2024-05-22

5

产品中心

服务支持

精选活动

关于我们

帮助中心

A3250LLT-T

A3250LLT-T 数据手册

与A3250LLT-T相关器件

与A3250LLT-T相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

A3250LLT-T

A3250LLT-T 数据手册

与A3250LLT-T相关器件

与A3250LLT-T相关文章

您还可以找

您在本页遇到什么问题？