Hi team,
Customer inquired that measured UVLO voltages are largely different from calculated values.
① Target : Von = 20V , Ｖoff = 18V (Von-Voff = 2.0V)
Ruvlo1=689.6 kΩ (680K＋9.6K)
Ruvlo2=44.5 kΩ (43K＋1.5K) with 1% grade resistors.
Measured values : Von = 18.87V , Ｖoff = 16.09V (Von - Voff = 2.78V)
② Target : Von = 20V , Ｖoff = 19.5V (Von-Voff = 0.5V)
Ruvlo1=174 kΩ
Ruvlo2=11.5 kΩ
Von = 19.26V , Ｖoff = 18.11V (Von-Voff = 1.15V)
Customer used an oscilloscope to measure input voltage value by gradually increasing/decreasing source voltage.
What kinds of problems are considered for these test results?
