A8698ELJTR-T datasheet(9/12 Pages) ALLEGRO

Part #	A8698ELJTR-T

Description	Wide Input Voltage 3.0 A Step Down Regulator

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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9 / 12 page

Wide Input Voltage 3.0 A Step Down Regulator

A8698

9

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

the connection. The Rr should be much larger than the feedback

resistor to prevent any potential offset in output voltage. For

example, if Rf < 10 kΩ, Rr should be 1 MΩ. Cr should be selected

based on the following equation:

=

Cr(max)

(VIN(min) – VFB) × tON(min)

0.05 × Rr

(5)

where Cr is in pF, tON(min) is in μs, and Rr is in MΩ.

RTSET Selection. Correct selection of RTSET values will

ensure that minimum on-time of the switcher is not violated and

prevent the switcher from cycle skipping. For a given VIN to

VOUT ratio, the RTSET value must be greater than or equal to the

value defined by the curve in the plot below.

Note. The curve represents the minimum RTSET value. When

calculating RTSET, be sure to use VIN(max) / VOUT(min). Resistor

tolerance should also be considered, so that under no operating

conditions the resistance on the TSET pin is allowed to go below

the minimum value.

FB Resistor Selection. The impedance of the FB network

should be kept low to improve noise immunity. Large value resis-

tors can pick up noise generated by the inductor, which can affect

voltage regulation of the switcher.

RTSET (k )

Violation of

Minimum On-Time

Safe Operating Area

Minimum

V

alue

of

R

TSET

13.0

12.5

12.0

11.5

11.0

10.5

10.0

9.5

9.0

8.5

8.0

7.5

7.0

6.5

6.0

5.5

5.0

4.5

4.0

3.5

3.0

2.5

2.0

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A8698ELJTR-T Datasheet(PDF) 9 Page - Allegro MicroSystems

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