VRG8691 datasheet(3/10 Pages) AEROFLEX

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SCD8691 Rev H 11/12/13

Aeroflex Plainview

VRG8691/92

VIN

VOUT

VSENSE

VREF (=1V)

CURR. LIMIT

ENABLE

IADJ

0.1µF

47µF

VBIAS

SLOW START

VBIAS

VIN

CURR. LIMIT

GND

0.1µF

FIGURE 2 –SETTING OUTPUT VOLTAGE

ENABLE 1/

Notes:

1/ ENABLE should be asserted after both VIN and VBIAS are applied.

(See Application Note 3, Figure 5 for the configuration where a separate ENABLE control line is NOT required).

2/ ICL varies directly with VIN.

(See Application Note 2 for adjusting the Current Limit, ICL).

To set the output voltage for a particular Vout:

- Choose an R2 value. (Recommended value = 1k

- Then use the following formula to determine the value of R1.

Table 1 shows example values for R1 and R2 to achieve some standard voltages.

Table 2 shows the nominal current limit settings if the ’CURR. LIMIT’ function (pin 8) is left open.

CLOAD

47µF

VOUT

Table 2

VIN

ICL NOM

11.5A

3.3V

7.5A

2.5V

5.7A

1.8V

4.1A

Table 1

Example R1 & R2 for typical VOUT

VOUT

3.3V



2.3k



2.5V



1.5k



1.8V



800



1.0V



APPLICATION NOTE 1

BASIC SET-UP

Setting the output voltage (VOUT):

VOUT - VREF

(R2 x IADJ) + VREF

R1 = R2 x

, where VREF = 1v, IADJ typ = 10pA

1µF

TANT

1µF

TANT

CER

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