Datasheet

Evaluation Board User Guide UG-139
Rev. A | Page 9 of 16
DEMO DAUGHTERBOARD
LED SUBBOARD
2.7V – 5.0V
3A
MEASURE I
BAT
WITH SCOPE
AND CURRENT PROBE
MEASURE I
LED
WITH SCOPE
AND CURRENT PROBE
SHORT
THICK
CABLES
GPIO2 FUNCTION
GPIO2 > I
LED
GPIO2 > TxMASK2
NO JUMPER
GPIO2 > USED FOR EXTERNAL
VOLTAGE MODE OF ADC
R3 = 0Ω
09024-010
Figure 10. Demonstration Daughterboard
The ADP1650 evaluation daughterboard is designed to quickly
evaluate key parameters of the ADP1650 IC. Headers are
available to measure currents using a current probe (preferred)
or ammeter.
Connect a power supply or Li-Ion battery with >3 A capability
to J5. Up to 2.5 A can be drawn from the battery; therefore,
short thick cables (provided) are recommended to minimize the
IR drops. A high current can cause a big IR drop, and V
IN
of
ADP1650 can be low enough to put the part into UVLO.
I
BAT
I
BAT
is the battery current and can be measured by using an
ammeter or current loop across J1.
I
LED
I
LED
is the LED current and can be measured by using an
ammeter or current loop across J2.
VIN
A VIN sense point is provided at TP21. This should be used to
sense the true voltage at the ADP1650 supply for measuring
LED power efficiency.
High V
F
LEDs
The LED subboard (at U2 in Figure 10) can be replaced with a
different subboard containing various LEDs with higher V
F
to
test the performance over the full range of LEDs used in a
production environment.