onsemi NCP1680, User Manual

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EVBUM2822/D
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4
Table 3. TEST POINT DESCRIPTIONS
REF DES Node REF DES Node
TP1 NCP1680 AUX Pin TP13 Slow Leg Bridge Node
TP2 GND @ NCP51530 Driver TP14 VOUT
TP3 NCP1680 FB Pin TP15 VOUT_RTN
TP4 NCP1680 PFCOK Pin TP16 NCP1680 SRH
TP5 NCP51530 VCC1 TP17 NCP1680 SRL
TP6 NCP1680 ZCD Pin TP18 PWRGND
TP7 VOUT_SNS TP19 NCP1680 SKIP Pin
TP8 NCP1680 VCC Pin TP20 NCP1680 LVSNS2 Pin
TP9 NCP1680 Polarity Pin TP21 NCP1680 LVSNS1 Pin
TP10 GND @ J3 Connector TP22 NCP1680 PWMH/HIN
TP11 Haversine @ L2 Inductor TP23 NCP1680 PWML/LIN
TP12 Fast Leg Bridge Node TP24 NCP1680 Fault Pin
In order to replicate the data published in this design note,
the following test set up is recommended:
•
For higher power measurements (> 10% load), always
arrange the connection so that the voltmeters at input and
output are as close to NCP1680 evaluation board (UUT)
as possible to avoid power loss due to resistance of the
wiring or any other instrumentation.
•
For input power measurement, please read power
measurement directly from the power meter. Do not
multiply V
AC
and I
AC
measurements, this is the apparent
power of UUT. The power measurement provides the real
power consumed by the UUT.
•
Do not use the electronic load reading for output voltage
measurement. A separate DMM placed directly across
output (TP14
− TP15) will produce a more accurate
reading than the eLoad and cancels some of the
instrumentation power loss in ammeter.
Figure 4. Test Setup for NCP1680 EVB
Power Meter
VAC
UUT eLoad
A
V
A
V