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Application Note 1386
PVCC
C PVCC
Vin
+
-
DC Source
Iin
PVCC
COMP/EN
VIN
VIN
Ai
FB
ISET
PHASE
VOUT
Vi
Cin
VOUT
Iout
+
-
DC Source
R FB
RSEN-EX
PGND
Vo
Cout
DC Load
Vout
FIGURE 5. EFFICIENCY MEASUREMENT SCHEMATIC
Efficiency and Output
Ripple/Noise Measurement
Figure 5 shows the efficiency measurement schematic for
the ISL820xMEVAL1Z POL module. The voltage and
DC POWER SUPPLY
PVCC
current meter can be used to measure input/output
voltage and current. In order to obtain an accurate
measurement and prevent the voltage drop of PCB or
wire trace, the voltage meter must be close to the
input/output pin of the POL module.
DC POWER SUPPLY
Vin
Current
Meter
ELECTRONIC LOAD
Output Power P OUT ( V OUT ? I OUT )
( V IN ? I IN )
P IN
The efficiency equation is shown in Equation 1:
Efficiency = ------------------------------------ = ---------------- = ----------------------------------------
Input Power
(EQ. 1)
+
Voltage
Meter
-
+
Voltage
Meter
-
The equipment setup for the efficiency measurement on
the evaluation board is shown in Figure 6. The measuring
point for the input voltage meter is at the C 3 terminal,
and the measuring point for the output voltage meter is
at the C 8 terminal (refer to Figure 9).
Output Ripple/Noise Measurement Method
The total noise is equal to the sum of the ripple and
noise components. Simple steps should be taken to
assure that there is minimum pickup noise due to the
high frequency events, which can be magnified by the
large ground loop formed by the oscilloscope probe
ground. This means that even a few inches of ground
wire on the oscilloscope probe may result in hundreds of
millivolts of noise spikes when improperly routed or
terminated. This effect can be overcome by using the
short loop measurement method to minimize the
measurement loop area for reducing the pickup noise.
The short loop measurement method is shown in
Figure 7. For ISL820xMEVAL1Z evaluation board, the
output ripple/noise measurement point is located at the
C 8 terminal (refer to Figure 9).
4
FIGURE 6. EQUIPMENT SETUP FOR EFFICIENCY
MEASUREMENT
SHORT LOOP
MEASUREMENT
METHOD
FIGURE 7. OUTPUT RIPPLE/NOISE
MEASUREMENT METHOD
AN1386.1
December 23, 2009
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