SP6133EB 查看數據表（PDF） - Signal Processing Technologies
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SP6133EB
Signal Processing Technologies
SP6133EB Datasheet PDF : 10 Pages
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USING THE EVALUATION BOARD
1) Powering Up the SP6133EB Circuit
Connect the SP6133 Evaluation Board with an external +12V power supply. Connect
with short leads and large diameter wire directly to the “VIN” and “GND” posts. Connect
a Load between the “VOUT” and “GND2” posts, again using short leads with large
diameter wire to minimize inductance and voltage drops.
2) Measuring Output Load Characteristics
It’s best to GND reference scope and digital meters using the Star GND post in the
center of the board. VOUT ripple can best be seen touching probe tip to the pad for
COUT and scope GND collar touching Star GND post – avoid a GND lead on the scope
which will increase noise pickup.
3) Using the Evaluation Board with Different Output Voltages
While the SP6133 Evaluation Board has been tested and delivered with the output set
to 3.30V, by simply changing one resistor, R2, the SP6133 can be set to other output
voltages. The relationship in the following formula is based on a voltage divider from the
output to the feedback pin VFB, which is set to an internal reference voltage of 0.80V.
Standard 1% metal film resistors of surface mount size 0603 are recommended.
Vout = 0.80V ( R1 / R2 + 1 ) => R2 = R1 / [ ( Vout / 0.80V ) – 1 ]
Where R1 = 68.1KΩ and for Vout = 0.80V setting, simply remove R2 from the board.
Furthermore, one could select the value of R1 and R2 combination to meet the exact
output voltage setting by restricting R1 resistance range such that 50KΩ ≤ R1 ≤ 100KΩ
for overall system loop stability.
Note that since the SP6133 Evaluation Board design was optimized for 12V down
conversion to 3.30V, changes of output voltage and/or input voltage will alter
performance from the data given in the Power Supply Data section.
POWER SUPPLY DATA
The SP6133EB is designed with an accurate 1.5% reference over line, load and
temperature. Figure 1 data shows a typical SP6133ER Evaluation Board efficiency plot,
with efficiencies to 95% and output currents to 10A. SP6133ER Load Regulation in
Figure 2 shows only 0.09% change in output voltage from no load to 10A load. Figures
3 and 4 show the fast transient response of the SP6133. Start-up response in Figures 5,
6 and 7 show a controlled start-up with different output load behavior when power is
applied where the input current rises smoothly as the soft-start ramp increases. In
Figure 8 the hiccup mode gets activated in response to an output dead short circuit
condition and will soft-start until the over-load is removed. Figure 9 and 10 show output
voltage ripple less than 30mV over complete load range.
While data on individual power supply boards may vary, the capability of the SP6133ER
of achieving high accuracy over a range of load conditions shown here is quite
impressive and desirable for accurate power supply design.
Rev 3/30/06
SP6133 Evaluation Manual
Page 2 of 10
Copyright 2006 Sipex Corporation
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