Datasheet > SVFA0515S

SVFA0515S

更新时间： 2022-05-14 22:20:19

品牌	Logo	应用领域
VPT		/
页数	文件大小	规格书
11页	556K
描述
SPACE QUALIFIED POINT OF LOAD CONVERTERS

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SVFA0515S 数据手册

SVFA0510S Series

6.0 TECHNICAL NOTES

Please note that many of these functions are also demonstrated in detail on the VPT website in the

form of technical video labs.

6.1 GENERAL INFORMATION

6.1.1 Topology Description

The SVFA0510S Series is a non-isolated, fixed-frequency, radiation-hardened, synchronous buck converter. It operates from a 5 V

input and provides a stepped-down, precisely regulated, programmable output voltage at very-high efficiency. The SVFA0510S is

optimized for low voltage point of load applications.

6.1.2 External Components

The SVFA0510S Series has internal input and output capacitors. To meet the performance specifications in Section 3.2, a minimum

additional 100 µF tantalum input decoupling capacitor is required. The SVFA0510S is stable with no load capacitance. Additional output

capacitance is allowed up to the maximum listed in Section 3.2.

6.1.3 Source Impedance

The impedance of the 5 V input source can interact with the point of load converter and can affect performance. High source

impedance is often caused by a long input cable or other components added in series with the input. In some cases, additional input

capacitance will be needed to stabilize the system.

6.2 FUNCTION DESCRIPTIONS

+VIN

6.2.1 On/Off Control (Inhibit)

The INH (Inhibit) pin is a control pin referenced to COM. The INH pin must be driven

using an open-collector or open-drain configuration. Pulling the INH pin low disables

the converter output. Leaving INH open enables the output, allowing the converter to

47K

INH

operate normally. The pin must be pulled below 1.5 V to disable the output. An

OPTIONAL

CAPACITOR

optional capacitor from INH to COM may be used to delay turn-on. The INH pin should

be left open if not used.

COM

6.2.2 Adjusting the Output Voltage (TRIM)

The output voltage of the converter is set with an external resistor connected from the TRIM pin to the COM pin. This resistor must

have a tolerance of 1% or better to achieve an accurate output voltage. The default output voltage with the TRIM pin left open is 0.8 V.

+VOUT

SVFA0510S

+Vout (V)

Rtrim (Ω)

None

205k

100

30K

0.8

+SENSE

TRIM

0.9

1.0

99.9k

47.4k

24.9k

15.9k

13.9k

12.4k

7.25k

5.4k

1.2

1.5

1.8

5.1K

1.9

2.0

2.5

R-TRIM

210K

0.7 V

2.8

3.0

4.44k

3.30k

2.98k

COM

3.3

3.4

Sales Information

Phone:(425) 353-3010

Fax: (425) 353-4030

SVFA0510S - 6.0

Page 6

E-mail: vptsales@vptpower.com

Web: www.vptpower.com

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