ADP5076ACBZ-R7 datasheet(16/23 Pages) AD

16 / 23 page

ADP5076

Data Sheet

Rev. A | Page 16 of 23

APPLICATIONS INFORMATION

COMPONENT SELECTION

Feedback Resistors

The ADP5076 provides an adjustable output voltage for both boost

and inverting regulators. An external resistor divider sets the

output voltage where the divider output must equal the

appropriate feedback reference voltage, VFB1 or VFB2. To limit the

output voltage accuracy degradation due to feedback bias current,

ensure that the current through the divider is at least 10 × IFB1 or

10 × IFB2.

Set the positive output for the boost regulator by

FT1

POS

FB1



 





where:

VPOS is the positive output voltage.

VFB1 is the FB1 reference voltage.

RFT1 is the feedback resistor from VPOS to FB1.

RFB1 is the feedback resistor from FB1 to AGND.

Set the negative output for the inverting regulator by



FT2

NEG

FB2

REF

FB2





where:

VNEG is the negative output voltage.

VFB2 is the FB2 reference voltage.

RFT2 is the feedback resistor from VNEG to FB2.

RFB2 is the feedback resistor from FB2 to VREF.

VREF is the VREF pin reference voltage.

Table 8. Recommended Feedback Resistor Values for Boost Regulator

Desired Output Voltage (V)

Boost Regulator

RFT1 (MΩ)

RFB1 (kΩ)

Calculated Output Voltage (V)

+4.2

0.432

102

4.188

0.604

115

5.002

1.24

121

8.998

+12

1.4

100

12.000

+13

2.1

137

13.063

+15

2.43

137

14.990

+18

2.15

100

18.000

+20

2.55

107

19.865

+24

3.09

107

23.903

+30

3.65

100

30.000

Table 9. Recommended Feedback Resistor Values for Inverting Regulator

Desired Output Voltage (V)

Inverting Regulator

RFT2 (MΩ)

RFB2 (kΩ)

Calculated Output Voltage (V)

−1.8

0.332

102

−1.804

−3

0.475

100

−3.000

−3.3

0.523

102

−3.302

−4.2

0.715

115

−4.174

−5

1.15

158

−5.023

−9

1.62

133

−8.944

−12

1.15

71.5

−12.067

−13

2.8

162

−13.027

−15

2.32

118

−14.929

−18

2.67

113

−18.103

−20

2.94

113

−20.014

−24

3.16

102

−23.984

−30

4.12

107

−30.004

ADP5076ACBZ-R7 데이터시트(PDF) 16 Page - Analog Devices

ADP5076ACBZ-R7 데이터시트(HTML) 16 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

데이터시트 다운로드

링크 URL