Buck DC-DC test specification definition: Buck DC-DC role: After changing the input voltage effective output fixed voltage voltage converter range:
1: Subject content: This specification specifies the test methods for the main performance parameters of DC-DC.
2: Scope of application: This specification is applicable to all kinds of DC-DC parameter testing.
Test instruments and requirements:
1: DC adjustable power supply (output voltage must be greater than the maximum IC input voltage; The output current must be greater than the maximum charging current of the IC).
2: oscilloscope.
3: Electronic load meter (CC mode)
4: ammeter (maximum range must be greater than the IC working maximum current, the minimum can measure microampere current)
5: multimeter
considerations
1: Avoid the influence of external interference on the test accuracy.
2: The test error caused by the test equipment should meet the requirements of the accuracy of the measured parameters.
3: The equipment and instruments connected to the test circuit should be tested after stable operation under set conditions.
Basic parameter test and test method
1: IQ: Test under the conditions of no load and IC off, IC power consumption current test conditions: A, input voltage (within the normal input voltage range), ambient temperature (normal temperature), the IC to be tested is connected to the test circuit, EN is connected to VIN, not connected to the load, test input current, static working current of IC B, the IC to be tested is connected to the test circuit, EN voltage is 0V, test input current is IC off current measurement standard: Refer to the specification, less than the maximum value of the specification
2: FSW: switching frequency test test conditions: A, normally connect the test circuit, input voltage is the typical input voltage value, load current (normal load current range), test switching frequency B, change the input voltage, output load current measurement standard: reference specification, error less than ±1%
3: VFB: Feedback voltage test test conditions: A, normally connect the test circuit, input voltage is the input typical voltage value, load current 0, measure FB terminal voltage B, change the input voltage, output current test