TPS92515: Noise issue

Jeff YANG

Mastermind 7745 points

Part Number: TPS92515

Tool/software:

Hi,

We occur TPS92515 noise issue.

Input voltage :9V

R15:20K

R14:10K

1.When the TPS92515 is operating without a load, the output voltage (LED1+, LED1-) exhibits the voltage waveform shown below, which is not a constant voltage output. How can this be adjusted?

2.When testing the TPS92515 with an electronic load in CR mode, why is the output unable to maintain a constant current?

E-load setting(OHM)	Output voltage (V)	Output current (A)
26	8.66	0.33
25	8.65	0.35
24	8.64	0.36
23	8.64	0.38
22	8.62	0.39
21	8.61	0.41
20	8.60	0.43
19	8.59	0.45
18	8.57	0.47
17	8.55	0.50
16	8.53	0.53

6 months ago

+1 Daniel Louis 6 months ago

TI__Expert 5670 points

Hi Jeff,

1. This device is a current source and not a current sink and therefore will not operate properly without a load

2. This device is a constant current device and not a constant voltage device.

3. Digital loads are not designed to emulate diodes and therefore are not an ideal way of testing our devices. Switch to a real resistive load or use the actual LEDs to test the device

Best,
Daniel

0 Jeff YANG 6 months ago in reply to Daniel Louis

Mastermind 7745 points

Hi Daniel,

Got it,We already solved the constant current issue.

This project has our circuit note diagram on the website, which may cause customer NDA issues. Please assist removing it. Thank you.

Jeff

0 Daniel Louis 6 months ago in reply to Jeff YANG

TI__Expert 5670 points

Hi Ken, I removed the circuit, is that okay?

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TPS92515: Noise issue