Page Comparison

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As a minimum, the following tests are strongly recommended once the PCB is assembled:

1. Maximum Drain Voltage – Verify that VDS of InnoSwitch4-CZ does not exceed the maximum continuous drain voltage and SR FET do not exceed 90% of breakdown voltages at the highest input voltage and peak (overload) output power in normal operation and during start-up.

2. Maximum Drain Current – At maximum ambient temperature, maximum input voltage and peak output (overload) power. Review drain current waveforms for any signs of transformer saturation or excessive leading-edge current spikes at start-up. Repeat tests under steady-state conditions and verify that the leading edge current spike is below ILIMIT(MIN) at the end of tLEB(MIN). Under all conditions, the maximum drain current for the primary switch should be below the specified absolute maximum ratings.

3. Thermal Check – At specified maximum output power, minimum input voltage and maximum ambient temperature, verify that temperature specification limits for InnoSwitch4-CZ IC, transformer, output SR FET, and output capacitors are not exceeded. Enough thermal margin should be allowed for part-to-part variation of the RDS(ON) of the InnoSwitch4-CZ IC. Under low-line, maximum power, a maximum InnoSwitch4-CZ SOURCE pin temperature of 110 °C is recommended to allow for these variations.

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https://www.youtube.com/watch?v=WQXABq45VIg&ab_channel=RobertBolanos

Tools:

• HV supply

• Load Tester

• Oscilloscope

Voltage Test at Test Points

Load tester:

• CC Mode

  • Test with 1A, 3A, 5A as per the spreadsheet

Use this spreadsheet for testing

Efficiency: 

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Tools:

• HV supply

• DMM

Procedure:

1. Open https://docs.google.com/spreadsheets/d/1j4ExuqtmNUZ8RIEcoD0iXZhGC9C0vgVWgL9Wz4GZ-gI/edit?usp=sharing

2. Set HV supply to specified test voltage (90V-150V)

3. Log current output value from HV supply in https://docs.google.com/spreadsheets/d/1j4ExuqtmNUZ8RIEcoD0iXZhGC9C0vgVWgL9Wz4GZ-gI/edit?usp=sharing

4. Measure with DMM Vout (output voltage), put value in https://docs.google.com/spreadsheets/d/1j4ExuqtmNUZ8RIEcoD0iXZhGC9C0vgVWgL9Wz4GZ-gI/edit?usp=sharing

5. Measure with DMM Iout (output current), put value in https://docs.google.com/spreadsheets/d/1j4ExuqtmNUZ8RIEcoD0iXZhGC9C0vgVWgL9Wz4GZ-gI/edit?usp=sharing

6. The spreadsheet will tell efficiency (in %)

7. Repeat 2 - 6 for each row of https://docs.google.com/spreadsheets/d/1j4ExuqtmNUZ8RIEcoD0iXZhGC9C0vgVWgL9Wz4GZ-gI/edit?usp=sharing

(Also use R10 current shunt for current sensing if necessary.)

Voltage Regulation:

ProcedureTest

1. Check that output is 12V under different inputs 90V - 150V

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1. 5 Test points

2. HV side - 90V - 150V

3. LV side - 12V

4. Primary Bias - 10V - 15V

5. Secondary Bias - 6V - 11V

BPP - 0V - 6V

while testing Efficiency

6. Comment out any outputs that are outliers

Load Stability:

Test at different current loads and modulate to see if there's any issues

(need to make a plan for this)

Overall everything can be tested and Recorded through:

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