Enpirion
®
Power Evaluation Board User Guide
EN5337QI
STEP 3: Connect the load to the output connectors VOUT (+) and GND (-), as
indicated in Figure 1.
STEP 4: Select the output voltage setting jumper. You may also set the POK
jumper to include the POK load if POK signal monitoring is intended. The only
time to disable POK is when measuring the absolute Disable current.
Figure 3: Output Voltage selection jumpers
Jumper shown selects 1.2V output
(Jumper positions from left are: 2.5V, 1.55V, 1.0V and 1.2V)
STEP 5: Apply V
IN
to the board and move the ENABLE jumper to the enabled
position. The EN5337QI is now powered up! Various measurements such as
efficiency, line and load regulation, input / output ripple, load transient, drop-out
voltage measurements may be made at this point. The over current trip level,
short circuit protection, under voltage lock out thresholds, temperature coefficient
of the output voltage may also be measured in this configuration.
STEP 5A: Power Up/Down Behavior – Remove ENA jumper and connect a
pulse generator (output disabled) signal to the middle pin of ENA and Ground.
Set the pulse amplitude to swing from 0 to 2.5 volts. Set the pulse period to
10msec. and duty cycle to 50%. Hook up oscilloscope probes to ENA, SS, POK
and VOUT with clean ground returns. Apply power to evaluation board. Enable
pulse generator output. Observe the SS capacitor and VOUT voltage ramps as
ENA goes high and again as ENA goes low. The device when powered down
ramps down the output voltage in a controlled manner before fully shutting down.
The output voltage level when POK is asserted /de-asserted as the device is
powered up / down may be observed as well as the clean output voltage ramp
and POK signals.
Figure 4: Means to Pulse Enable
STEP 6: External Clock Synchronization / Spread Spectrum Modes: In order
to activate this mode, it may be necessary to a solder a SMA connector at J8.
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