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# TPS92515AHV-Q1: The problem of TPS92515AHV-Q1 and TPS92515HV-Q1

Part Number: TPS92515AHV-Q1
Other Parts Discussed in Thread: TPS92515HV-Q1,

Hi,

1. What is the difference between TPS92515AHV-Q1 and TPS92515HV-Q1? How does this part of function TPS92515HV-Q1 realize?
There is an explanation about the difference between the two in the E2E forum. The post describes that the TPS92515AHV-Q1 cancels the function of the offset calibration circuit. If this is the case, what is the function of this part of the circuit, and which part does it belong to in the figure below?

2. What kind of impact will the cancellation of this part of the function have on the circuit? Will it cause abnormal output current accuracy? Customers find that the output cross current accuracy of the two is different. The output cross current accuracy of TPS92515HV-Q1 is 4.58%, while the output cross current accuracy of TPS92515AHV-Q1 is 7.08%.

3. If TPS92515AHV-Q1 uses an external circuit for calibration, what is the calibration method, how to set the external circuit, and is there a circuit for reference?
4. Is it feasible for customers to directly replace TPS92515HV-Q1 with TPS92515AHV-Q1?

• Hello Alon,

1)  The non 'A' part has the calibration circuit.  It makes the set-point accuracy higher.  Look at page 5 table 7.5 top section.  It shows the Vin - Vcsn peak current threshold range.  The 'A' part does not have this calibration circuit, check it's table and notice the difference.  If deep analog dimming is used the non 'A' part can change the calibration set-point on parts near the calibration point causing a light change on power cycle.  At full brightness this is not noticeable.  If deep analog dimming set-point change during power cycling needs to be avoided then the 'A' part should be used.

2)  It is not abnormal it just won't have an as accurate set-point because the error amplifier offset isn't compensated by the calibration circuit.

3)  If using an external correction circuit one would adjust Viadj to an operating current on all boards with an external circuit.  This should be done with the 'A' part since the power on calibration would change this unless the external circuit did calibration every turn-on

4)  Yes, it functions the same besides the power on calibration versus not.

Best Regards,