Test Procedure for the LV5980MCGEVB Evaluation Board
Test Setup 1
1.
2.
3.
4.
5.
Operating Current
Soft Start Waveforms
Operate & Output Waveforms
HICCUP Operating Waveforms
Load Transient Response
Nov/2012
1
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Digital Multimeter
Test Setup 1
Oscilloscope
Resistor
Current limited
DC Power Supply
Fig 1 : Test Setup 1
Suggested Equipment :
Current limited DC Power Supply (e.g. ADVANTEST R6243 DC Voltage Current Source/Monitor ) ………
Digital Multimeter {able to measure up to 30V and 3A} (e.g. ADVANTEST R6452 Digital Multimeter) ……
Electronic Load (e.g. FUJITSU ACCESS LIMITED Electric Load EUL-150αXL ) ……………………………
Oscilloscope (e.g. LeCroy WaveJet ) ……………………………………………………………………………..
Nov/2012
2
1pc
1pc
1pc
1pc
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1.Operating Current
The layout is as shown in Figure 1 : Test_setup1 and supply input voltage (VIN = 24V).
Connected to the output load resistance (2.5kΩ).
Measure the current consumption, to ensure that it is within the specified value.
2.Soft Start Waveforms
Graph 1 Soft Start Waveforms
The trigger of oscilloscope is set to the rising edge
and falling edge of EN voltage (VEN).
VOUT
2V/DIV
Soft Start Time
VIN
10V/DIV
To measure the waveform of the startup when terminal EN shorted to
GND, was released.
Soft-start time to confirm whether it is within the specified value.
(Graph.1)
Nov/2012
3
0.5ms/DIV
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Test Setup 2
1.
2.
3.
4.
5.
Operating Current
Soft Start Waveforms
Operate & Output Waveforms
HICCUP Operating Waveforms
Load Transient Response
Nov/2012
4
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Test Setup 2
Oscilloscope
Current limited
DC Power Supply
Fig 2 : Test Setup 2
Electronic Load
Suggested Equipment :
Current limited DC Power Supply (e.g. ADVANTEST R6243 DC Voltage Current Source/Monitor ) ……… 1pc
Electronic Load (e.g. FUJITSU ACCESS LIMITED Electric Load EUL-150αXL ) …………………………… 1pc
Oscilloscope (e.g. LeCroy WaveJet ) …………………………………………………………………………….. 1pc
Nov/2012
5
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Graph 2 Operate & Output Waveforms (1)
3.Operate & Output Waveforms
VOUT (AC)
20mV/DIV
The layout is as shown in Figure 1 : Test_setup1
and supply input voltage (VIN = 24V).
Output Ripple Voltage
VSW
10V/DIV
Ensure that the output ripple voltage and the switching frequency is
within the specified value raise the current value of the electronic load.
(Graph.2 & Graph.3)
5us/DIV
Graph 3 Operate & Output Waveforms (2)
VOUT (AC)
20mV/DIV
VSW
10V/DIV
4.HICCUP Operating Waveforms
(OCP) makes the over-current limiter operation further up
the current value of the electronic load.
5us/DIV
Graph 4 HICCUP Operating Waveforms
VOUT
5V/DIV
Measure the HICCUP time, to ensure that it is within the specified value.
HICCUP Time
VSW
10V/DIV
5ms/DIV
Nov/2012
6
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5.Load Transient Response
The load current (IOUT) is increased by pulse (1A ⇔ 3A) using the electric load.
Setting Slew Rate = 100us
Measure the waveform of output ripple voltage (VOUT (AC)) when the load is changed. (Graph.5 ~ 7)
Ensure that the variation of the output voltage is within the specified value.
Probe to measure VOUT (AC) connect as short as possible.
Graph 5 Load Transient Response (1)
VOUT (AC)
0.1V/DIV
1ms/DIV
Graph 6 Load Transient Response (2)
Undershoot Voltage
Graph 7 Load Transient Response (3)
VOUT (AC)
0.1V/DIV
200us/DIV
Nov/2012
Overshoot Voltage
VOUT (AC)
0.1V/DIV
200us/DIV
7
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