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Original question:

ULQ2003A: Rising time and falling time

ULQ2003A: Spice model and rising time (falling time)

Liu Yang
Expert 8695 points
Part Number: ULQ2003A
Other Parts Discussed in Thread: TPL7407LA

Hi Team,

Please help me answer the follow question from my customer, thank you so much.

Please tell me about ULQ2003A rising time and falling time under the following conditions.
[Condition] Input:0-5V pulse (rising and falling time are not considered)
                 Output:load resistance (about 1kΩ)

8802.rising falling time.pdf

[background]
This transistor array is used to generate gate pulses (ON / OFF signals for driving the switching module).
I connected a photocoupler and a resistor to the output terminal to turn the 15V power supply on and off, but the photocoupler has a built-in high sensitivity IC, and IF(Photocoupler input current) is specified to be driven within 0.5uS of rising time and falling time. (Refer to the attached)
I inquiry this problem because he rising time (falling time) of IF (photocoupler input current) depends on the characteristics of this transistor array.
Also, can you provide a spice model of ULQ2003A (or the same specification) that I want to simulate here?

transistor array.pdf


Best Regards,
Tom Liu

  • 0
    TI__Genius 15760 points

    Hi Tom,

    We cannot guarantee that the rise time and fall time will be limited to 0.5us since this is dependent on loading conditions and temperature variation. The best way to guarantee this rise/fall time is to evaluate the device with your specific load to see what the behavior looks like.

    As for modeling, these are legacy devices, so no models are available and we do not have any plans to create them. Another low side switch that is functionally equivalent is the TPL7407LA, and that model is available online.

    Thanks,

    Alek Kaknevicius