NCP6361BGEVB_TEST_PROCEDURE - 286 KB

12/2/2013
Test Procedure for the NCP6361BGEVB Evaluation Board
Initial Setup:
The initial setup given here is recommended before starting measurements on the evaluation board.
 Jumper Configuration: initial / default setup
 LTR1 not connected
 LTR2 connected − Can be used for visualizing the current in the inductor (ILX) using an oscilloscope current
probe
 LTR3 connected − Connect FB pin to Vout
 S1: Enable pin; default with jumper connected to VBAT (Logic Level High), device is activated by default
 S2: ByPass Enable option, default with jumper connected to GND (Logic Level Low), By Pass not activated
 S3: Frequency Selection pin, default with jumper connected to GND (Logic level Low), FSEL = 0 →
Frequency = 6 MHz selected
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Connect Vin (VBAT) with VBAT tuned at 3.7 V for example
Connect VCON with VCON tuned at 0.8 V for example:Vout = 0.8V x 2.5 = 2V
Connect load (8 Ω or 10 Ω respectively 250 mA or 200 mA considering Vout = 2 V) or connect a current source
tuned with 100 mA (as initial load value)
Connect voltage probe or multi−meter on Vout test point
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Other test points can be eventually checked: VCON (TP9), FB, VBAT, EN, FSEL and BPEN
SW test point is available as well
Apply VBAT = 3.7 V first then VCON = 0.8 V and finally IOUT (100 mA) if current source connected
Check Vout = 2 V
VBAT can vary from 2.5 V to 5.5 V according to datasheet
VCON can vary from 0.16 V to 1.4 V with a corresponding respective Vout of 0.4 V typical and 3.5 V typical
Output current can vary from 0 to 800 mA in PWM mode and up to 1.2 A in By Pass mode
Operating Modes:
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4 operating modes are available: they can be checked by sweeping VCON according to datasheet specification and
below rough guide lines:
Sleep Mode with VCON below about 0.125 V
PFM Mode with VCON above 0.125 V
PWM Mode when Iout above about 200 mA
By Pass Mode when Vout close to Vin such as Vin – Vout below about 200 mV or by forcing bypass mode
with pin BPEN