Datasheet > SP7655_05

SP7655_05

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
西伯斯 - SIPEX		/
页数	文件大小	规格书
10页	491K
描述
Evaluation Board Manual

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SP7655_05 数据手册

USING THE EVALUATION BOARD

1) Powering Up the SP7655EB Circuit

Connect the SP7655 Evaluation Board with an external +24V 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

VOUT ripple can best be seen touching probe tip to the pad for C3 and scope GND

collar touching GND side of C3 using short wrapped wire around collar – avoid a GND

lead on the scope which will increase noise pickup.

3) Using the Evaluation Board with Different Output Voltages

While the SP7655 Evaluation Board has been tested and delivered with the output set

to 3.30V, by simply changing one resistor, R2, the SP7655 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 SP7655 Evaluation Board design was optimized for 24V 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. In addition, the

SP7655ER provides short circuit protection by sensing Vout at GND.

POWER SUPPLY DATA

The SP7655ER is designed with a very accurate 1.0% reference over line, load and

temperature. Figure 1 data shows a typical SP7655 Evaluation Board Efficiency plot,

with efficiencies to 85% (Including generation of 5V Vcc) and output currents to 8A.

SP7655ER Load Regulation is shown in Figure 2 of only 1% change in output voltage

from 0.5A load to 8A load. Figures 3 and 4 illustrate a 5A to 8A and 0A to 6A Load Step.

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

Softstart ramp increases. In Figure 8 the SP7655ER is configured for hiccup mode in

response to an output dead short circuit condition and will Softstart until the over-load is

removed. Figure 9 and 10 show output voltage ripple less than 135mV at no load to 8A

load.

While data on individual power supply boards may vary, the capability of the SP7655ER

of achieving high accuracy over a range of load conditions shown here is quite

impressive and desirable for accurate power supply design.

123 4 5 6 7...10

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