Datasheet > SP-QR-C-4617

SP-QR-C-4617

更新时间： 2024-11-13 01:23:43

品牌	Logo	应用领域
日亚株式会社 - NICHIA		/
页数	文件大小	规格书
1页	123K
描述
Tj Control for Good Heat Dissipation in NVSU333A (U365) with Water Cooling System

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SP-QR-C-4617 数据手册

Application Note

Tj Control for Good Heat Dissipation in NVSU333A (U365) with Water Cooling System

1. Objective

The LEDs’ light output can be affected by the heat generated from the LEDs/LED-assembled products.

Also, the reliability performance can be seriously degraded, if the LEDs are operated over the absolute

maximum rated junction temperature (Tj).

It is critical to design the heat dissipation performance not to exceed the T_jmaxfor NVSU333A, to deliver high

reliability/performance.

This document shows the Tj evaluation results by demonstrating two heat dissipation conditions with a water

cooling system. Please use the data for reference to your thermal design.

2. Tj Calculation

Tj can be calculated by the following formula:

Tj = Ts + Rthj-s × P_D

Thermistor

Tj: Junction Temperature

Ts: Soldering Temperature (°C)

Rthj-s: Thermal resistance (°C/W) from the die to the Ts measuring point

* Rthj-s (NVSU333A): 2.08°C/W

TS Point

PD: Input Power (W)

3. Ts Measuring Point

Cathode Mark

Picture 1 Ts Measuring Point

The thermocouple was solder-attached to

the Ts measuring point for the evaluation.

(Board Size: 60mm ˣ 60 mm ˣ 1mm)

Anode

Cathode

Ts Point

4. Tj Evaluation Result

Board

I_F(A)

3.5

Thermistor(

)

T (

)

V_F(V)

3.85

T ( )

℃

3.5

3.85

5. Heat Dissipating Conditions

Interface between Heat Sink and Board

Input Current

Water Flow

LED Pitch

Temperature

Cooling Heat Sink

Internal Circuit

9 LEDs

Thermal Conductivity

［］

L/min.

［

］

［

］

［℃］

Material

W/(m K)

［

・

］

Oxygen-free copper

60mm×60mm×10mm

3.5

2.5

8.2

0.9

Grease

connected in series

Note

We specified the absolute maximum ratings for NVSU333A; IF=4.5A and T_jmax= 100°C.

We cannot guarantee the usage over these ratings.

We appreciate your understanding and cooperation.

This sheet contains tentative information; we may change the contents without notice.

(SP-QR-C-4617)

Oct. 21, 2014

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