Analog Devices EVAL-ADP5020 Manual page 15

Quiescent Current Measurement
The ADP5020 has separated supply lines for Buck 1 (V
(V ) and LDO (V ), in addition to the analog circuit supply
DD2 DD3
(V ). The I current can be measured using a current loop
DDA DD1
across LK12. I can be measured using a current loop across
DD2
JP3 Position 1 to JP3 Position 2. I
current loop across JP5 Position 1 to JP5 Position 2. I
measured using a current loop across JP10. R4 must be removed.
Regulator Switching Nodes
The Buck 1 switching frequency can be measured on TP25 (SW1).
TP21 is a local power ground that can be used to con-nect the
scope probe to minimize the switching noise pickup.
Buck 2 switching frequency can be measured on TP22. TP24 is a
local power ground that can be used to connect the scope probe to
minimize the switching noise pickup.
Kelvin Measurements
The input and output voltages are routed to Connector J6 using
Kelvin connections, meaning that the point of measurement is
directly on the capacitor pads. This minimizes the measurement
error due to IR drop from the trace resistance. Table 2 and Table 3
show the signals available on Connector J6 and Connector J5,
respectively.
Power Board from USB Port Only
To power the board via the USB without using an external
supply, short Jumper LK10 on the motherboard (USB position).
Avoid exceeding the 500 mA current limit of the USB.
), Buck 2
DD1
can be measured using a
DD3
can be
DDA
Rev. 0 | Page 15 of 24
Table 2. Measurement Signals on J6
Signal J6 Pins
EN/GPIO 20
VDDIO 19
SYNC 18
SDA 17
SCL 16
XSHTDWN 15
+VO2S, VO2S 14, 13
+VD2S, −VD2S 12, 11
+VD1S,−VD1S 10, 9
+VO3S, −VO3S 8, 7
+VD3S, −VD3S 6, 5
+VO1S, −VO1S 4, 3
GND 2
Table 3. Measurement Signals on J5
Signal J5 Pins
VDDA 20
+VDA, −VDA 19, 13
+VO2 18, 17
−VO2 16, 15
VDD2 14
VDD1A, VDD1B 12, 11
+VO3
10, 9
−VO3 8
−VO1
6, 5
+VO1
4, 3
VDD3 2
GND 7, 1
EVAL-ADP5020
Description
EN/GPIO pin from IC
ADP5020 logic supply
External frequency
2
I C bidirectional line
I 2 C clock line
XSHTDN pin from IC
Buck 2 output voltage (+/−)
Buck 2 input voltage (+/−)
Buck 1 input voltage (+/−)
LDO output voltage (+/−)
LDO input voltage (+/−)
Buck 1 output voltage (+/−)
Ground plane and digital grounds
Description
Analog supply input
VDDA input voltage (+/−)
Buck 2 output positive voltage
Buck 2 output negative voltage
Buck 2 input voltage
Buck 1 input voltage
LDO output voltage (+)
LDO output voltage (−)
Buck 1 output voltage (−)
Buck 1 output voltage (+)
LDO input voltage
Ground plane and digital grounds