PFS7523L datasheet(18/36 Pages) POWERINT

18 / 36 page

Rev. A 06/15

PFS7523-7529/7533-7539

www.power.com

Quick Design Checklist

As with any power supply design, all HiperPFS-3 designs should be

verified on the bench to make sure that component specifications are

not exceeded under worst-case conditions. The following minimum

set of tests is strongly recommended:

Maximum drain voltage – Verify that peak VDS does not exceed

530 V at lowest input voltage and maximum overload output

power. Maximum overload output power occurs when the

output is overloaded to a level just above the highest rated load

or before the power supply output voltage starts falling out of

regulation. Additional external snubbers should be used if this

voltage is exceeded. In most designs, addition of a ceramic

capacitor in the range of 33 pF and 100 pF connected across the

PFC output diode will reduce the maximum drain-source voltage

to a level below the BV

DSS rating. When measuring drain-source

voltage of the MOSFET, a high-voltage probe should be used.

When the probe tip is removed, a silver ring in the vicinity of the

probe tip can be seen. This ring is at ground potential and the

best ground connection point for making noise free measure-

ments. Wrapping stiff wire around the ground ring and then

connecting that ground wire into the circuit with the shortest

possible wire length, and connecting the probe tip to the point

being measured, ensures error free measurement. Probe should

be compensated according to probe manufacturer’s guidelines to

ensure error-free measurement.

Maximum drain current – Drain current can be measured

indirectly by monitoring inductor current. A current probe

should be inserted between the bridge rectifier and inductor

connection. At maximum ambient temperature, minimum input

voltage and maximum output load, verify drain current wave-

forms at start-up for any signs of inductor saturation. When

performing this measurement with Sendust inductor, it is typical

to see inductor wave-forms that show exponential increase in

current due to permeability drop. This should not be confused

with hard saturation.

Thermal check – At maximum output power, minimum input

voltage and maximum ambient temperature; verify that

temperature specifications are not exceeded for the HiperPFS-3,

PFC inductor, output diodes and output capacitors. Enough

thermal margin should be allowed for the part-to-part variation

of the R

DS(ON) of HiperPFS-3, as specified in the data sheet. A

maximum package temperature of 100 °C is recommended to

allow for these variations.

Input PF should improve with load, if performance is found to

progressively deteriorate with loading, it is a sign of possible

noise pick-up by the VOLTAGE MONITOR pin circuit or the

feedback divider network and the compensation circuit.

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