Datasheet
ADP1851-EVALZ User Guide UG-443
Rev. 0 | Page 5 of 12
EVALUATION BOARD OPERATING INSTRUCTION
1. Connect Jumper JP2 (EN) with a shunt to the low position
(disabled).
2. Connect Jumper JP1 (FRQ) with a shunt to the high
position for 600 kHz operation.
3. Connect Jumper JP5 (SYNC) with a shunt to the high
position for PWM operation or to the low position for
pulse skip operation at light load.
4. Remove Jumper JP4 (TRK) for the soft-start operation.
5. Connect a power supply to the board input terminals
VIN+ and GND and apply 12 V.
6. Connect Jumper JP2 (EN) to the high position to enable
the ADP1851.
Table 1. Jumper Description
Jumper Description
Default Factory
Setting Function
JP1 FRQ Low Connect shunt low for 300 kHz or high for 600 kHz switching frequency operation.
The ADP1851-EVALZ is configured for operation at 600 kHz. Connect JP1 high.
JP2 EN Low Connect shunt high to enable the ADP1851 or low to disable it.
JP4 TRK Open Keep open to study the soft-start function. Short with shunt to study the tracking capability
when the master voltage is applied to TP18 (TRK_IN) and divided with the R8/R9 resistors.
JP5 SYNC Low Connect shunt high for PWM or low for pulse skip operation. For synchronization, remove the
shunt from JP5 and apply an external clock to the TP12 SYNC.
Table 2. Performance Summary (T
A
= 25°C)
Parameter Condition
V
IN
9 V to 15 V
f
SW
Switching frequency, 600 kHz
V
OUT
1.8 V
I
OUT
0 A to 25 A
V
OUT
Ripple, DC Load 35 mV at 25 A load
V
OUT
Deviation upon Step Load Release 2.5% with 10 A step load