NJU7036 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU7036

High Output Current, Single Supply, Rail-to-Rail Output Dual CMOS Operational Amplifier

Japan Radio Corporation  

NJU7036

IApplication Notes

•Package Power, Power Dissipation and Output Power

IC is heated by own operation and possibly gets damage when the junction power exceeds the acceptable value called Power

Dissipation PD. The dependence of the NJU7036 PD on ambient temperature is shown in Fig 1. The plots are depended on following

two points. The first is PD on ambient temperature 25℃, which is the maximum power dissipation. The second is 0W, which means

that the IC cannot radiate any more. Conforming the maximum junction temperature Tjmax to the storage temperature Tstg derives

this point. Fig.1 is drawn by connecting those points and conforming the PD lower than 25℃ to it on 25℃. The PD is shown following

formula as a function of the ambient temperature between those points.

Dissipation

Power

PD

=

Tj

max −

θja

Ta

[W] （Ta=25℃～Ta=150℃）

Where, θja is heat thermal resistance which depends on parameters such as package material, frame material and so on.

Therefore, PD is different in each package.

While, the actual measurement of dissipation power on NJU7036 is obtained using following equation.

(Actual Dissipation Power) = (Supply Voltage VDD) X (Supply Current IDD) – (Output Power Po)

The NJU7036 should be operated in lower than PD of the actual dissipation power.

To sustain the steady state operation, take account of the Dissipation Power and thermal design.

PD [mW]

EMP14

4-layer 1300mW

PCSP20

4-layer 1080mW

EMP14

2-layer 890mW

PCSP20

2-layer 550mW

-40

25

85

150

Ta [℃]

Fig.1 Power Dissipations vs. Ambient Temperature on the NJU7036.

•Thermal Protection

The NJU7036 is designed with Thermal Shut Down (TSD) circuitry that protects itself from damage caused by overload

condition. The TSD circuitry is operated when the junction temperature reaches approximately 180℃, and the actual

measurement of dissipation power is reduced by the stopped output current. When the junction temperature cools to

approximately 150℃, the output circuitry is automatically re-enabled. Continuously running the NJU7036 into the thermal

shutdown possibly damages device since the TSD circuit doesn’t have active cooling function such as heat sinking. To sustain

the steady state operation, the NJU7036 should be operated in lower than the Dissipation Power of the actual dissipation

power.

•Current Limit

The NJU7036 should be operated in lower than 500mA of output current. The NJU7036 has current limiting circuitry that

prevents from exceeding output current caused by grounding in order to enhance the safety of operation. The circuitry limits

output current to approximately 1A. Although the output current is lower than 500mA, the device possibly gets damage duo to

heating by output current. To sustain the steady state operation, the NJU7036 should be operated in lower than 500mA of output

current and lower than the Dissipation Power of the actual dissipation power.

-4-

E2 20090121

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