Datasheet of TL594

Takahiro Nishizawa

Genius 5575 points

Other Parts Discussed in Thread: TL594, TL594C

I have questions about TL594.

Question 1.

- In Application Report　SPRA953C, 1.2 Test Card Impact(p.3), there are 1s and 2s2p about Rθja.

Is it 1s or 2s2p about TL594 Rθja?

Qurstion 2.

- In datasheet p.5 REFERENCE, Output-voltage change with temperature, maximum voltage is 10mV/V.

Are the following understandings correct?

　 Reference voltage is 5V. So, the voltage fluctuates by 50mv(=10mV/V x 5V) .

Question 3.

- In datasheet p.5, Frequency change with temperature, maximum frequency is 50Hz/kHz.

Are the following understandings correct?

For example, when frequency is 100kHz, the frequency fluctuates by 5kHz(=50Hz/kHz x 100kHz).

Question 4.

- TL594C and TL594I have different temperature ranges.

TL594C: 0~70°C

TL594I: -40~85°C

Is the fluctuate amount of TL594C and TL594I the same about Output-voltage change with temperature and Frequency change?

Best regards,

Takahiro Nishizawa

over 8 years ago

0 Peter Meaney over 8 years ago

TI__Mastermind 31580 points

Hi Takahiro-san,

1. I cant tell from the datasheet if the thermal data is for single layer or 2 layer PCB. I will need to ask someone else within TI.

2. Reference voltage change with Temperature is 50mV max

3. At 100kHz, frequency change with temperature is 5kHz

4. From reading the datasheet I expect that the TL594L will have the same variation for the reference voltage and Frequency change as the TL594C even though it is specified over a wider temperature range.

Regards

Peter

0 Takahiro Nishizawa over 8 years ago in reply to Peter Meaney

Genius 5575 points

Dear Peter-san

Thank you for your answer!

We are waiting for your answer of question 1.

- In Application Report　SPRA953C, 1.2 Test Card Impact(p.3), there are 1s and 2s2p about Rθja.

Is it 1s or 2s2p about TL594 Rθja?

Best regards,

Takahiro Nishizawa

0 Peter Meaney over 8 years ago in reply to Takahiro Nishizawa

TI__Mastermind 31580 points

Hi Takahiro-san,

I am still waiting on a reply for inside TI, please give me another day or two.

Thanks

Peter

0 Peter Meaney over 8 years ago in reply to Peter Meaney

TI__Mastermind 31580 points

Hi Takahiro-san,

The thermal analysis for the values in the datasheet would have used a 4-layer (2s2p) JEDEC standard PCB, except for the Theta-JC (Top) values, which would have used a single layer PCB.

Regards

Peter

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Datasheet of TL594