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AS3658F-BCTP датащи(PDF) 20 Page - ams AG

номер детали AS3658F-BCTP
подробное описание детали  Power and Audio Management Unit for Portable Devices
PDF  158 Pages
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производитель  AMSCO [ams AG]
домашняя страница  http://www.ams.com
Logo AMSCO - ams AG

AS3658F-BCTP датащи(HTML) 20 Page - ams AG

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Revision 1v13
19 - 157
AS3658
Data Sheet Confidential - Detail ed Descri ption-Power Management Functions
Figure 6. DC/DC step up 1 converter with regulated output voltage of 5V. Feedback is at pin DCDC_FB1
Voltage Feedback: (see Figure 6)
For Step UP DCDC 1 voltage feedback is always selected on pin DCDC_FB1. For Step-up UP DCDC 2 set step2_fb to
00 to enable voltage feedback at pin DCDC_FB2.
Bit stepX_res (X = 1 or 2) should be set to 1 in voltage feedback mode using two resistors.
The output voltage is regulated to a constant value, given by:
1
2
2
1
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_
25
.
1
R
I
R
R
R
V
FB
DCDC
I
out
stepup
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=
If R2 is not used, the output voltage is:
Vstepup_out: Step up regulator output voltage
R1 Feedback resistor R1
R2 Feedback resistor R2
IVturning: Tuning current on DCDC_FB pin: stpupX_v (0µA to 15µA (1µA steps)) (X= 1 or 2)

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