Datasheet
NXP Semiconductors
KTFRDMPF1550EVMUG
FRDM-PF1550EVM evaluation board
KTFRDMPF1550EVMUG All information provided in this document is subject to legal disclaimers. © NXP B.V. 2018. All rights reserved.
User guide Rev. 2.0 — 7 March 2018
17 / 34
7.3 Using onboard ELOAD
Onboard electronic load (ELOAD) provides adjustable load current from 0 to 1000 mA
in 50 mA steps. The ELOAD is useful for testing supply performance or evaluating a
particular PMIC supply rail at a specified load current.
To use the ELOAD, connect a suitable jumper wire (short length with proper gauge)
between ELOAD (TP59) and the desired supply VOUT test point. Continuous operation
under full load current heats up the EVB. Set the ELOAD back to 0 mA when finished.
Below is an example of a script that demonstrates the use of the ELOAD to test the
LDO1 current limit of 150 mA.
//-----------------------------------------------------------------------------
// LDO1 CURRENT LIMIT (150mA) TEST USING ELOAD A
// (Jumper ELOAD A to LDO1)
//-----------------------------------------------------------------------------
LDO1:VOUT:2.000 // SET LDO1 VOUT = 2.000V
LDO1:ENABLE:ON // ENABLE LDO1
DELAY:100 // ALLOW 100ms FOR VOUT TO RAMP UP
LOG:LDO1:VSENSE // MEASURE LDO1 VOUT
ELOAD_A_ISET:50 // APPLY 50mA LOAD CURRENT
DELAY:100 // ALLOW 100ms TO STABILIZE
LOG:LDO1:VSENSE // MEASURE LDO1 VOUT
ELOAD_A_ISET:100 // APPLY 100mA LOAD CURRENT
DELAY:100 // ALLOW 100ms TO STABILIZE
LOG:LDO1:VSENSE // MEASURE LDO1 VOUT
ELOAD_A_ISET:150 // APPLY 150mA LOAD CURRENT
DELAY:100 // ALLOW 100ms TO STABILIZE
LOG:LDO1:VSENSE // MEASURE LDO1 VOUT
ELOAD_A_ISET:200 // APPLY 200mA LOAD CURRENT
DELAY:100 // ALLOW 100ms TO STABILIZE
LOG:LDO1:VSENSE // MEASURE LDO1 VOUT (SHOULD BE less than 200mV)
ELOAD_A_ISET:250 // APPLY 250mA LOAD CURRENT
DELAY:100 // ALLOW 100ms TO STABILIZE
LOG:LDO1:VSENSE // MEASURE LDO1 VOUT (SHOULD BE less than 200mV)
ELOAD_A_ISET:300 // APPLY 300mA LOAD CURRENT
DELAY:100 // ALLOW 100ms TO STABIIZE
LOG:LDO1:VSENSE // MEASURE LDO1 VOUT (SHOULD BE less than 200mV)
//-----------------------------------------------------------------------------
ELOAD_A_ISET:0 // REMOVE THE LOAD CURRENT (0mA)
DELAY:100 // ALLOW 100ms FOR SUPPLY TO RECOVER
LOG:LDO1:VSENSE // MEASURE LDO1 VOUT (SHOULD BE ~2.000V)
LDO1:ENABLE:OFF // DISABLE SUPPLY