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AS3715 Datasheet(PDF) 35 Page - ams-OSRAM AG

Part # AS3715
Description  Dual or Single Power Path PMIC
PDF  159 Pages
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Manufacturer  AMSOSRAM [ams-OSRAM AG]
Direct Link  https://ams-osram.com/
Logo AMSOSRAM - ams-OSRAM AG

AS3715 Datasheet(HTML) 35 Page - ams-OSRAM AG

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Page 34
ams Datasheet
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[v1-03] 2015-Aug-10
AS3715 − Detailed Description – Power Management Functions
Feedback Selection
For the step up the following feedback selections are possible
(selected by setpup2_fb): (see Figure 35)
Current Feedback
CURR1, CURR2 and CURR3 can be selected by setpup2_fb as a
current feedback pin.
The step-up converter is regulated such that the required
current at the feedback path can be supported. In this mode
the output voltage will be limited by limiting the voltage on the
selected feedback pin to 1.25V (select the external resistor
network and stepup2_v to adjust this limitation voltage).
stepup2_prot_dis has to be set to 0, otherwise the protection is
disabled.
Always choose the path with the higher voltage drop as
feedback to guarantee adequate supply for the other,
unregulated path.
Current Feedback with Automatic Feedback Selection
Same as above, but when currX_ctrl = 10b for the used current
sinks, the chip automatically selects the highest string (CURR1,
CURR2 or CURR3) as feedback input.
Voltage Feedback
The step-up converter output voltage is regulated by regulating
the selected feedback pin voltage to 1.25V.
Calculating Resistors for Voltage Feedback or
Over-Voltage Protection
Bit stepup_res should be set to 1 in voltage feedback mode
using two resistors.
The output voltage is regulated to a constant value, given by:
If R2 is not used, the output voltage is:
VSU: Step up regulator output voltage
R1 Feedback resistor R1
R2 Feedback resistor R2
IFB: Tuning current on FB_SU pin: stepup2_v
(0..31μA (1μA steps))
(EQ1)
VSU
R1 R2
+
R2
------------------- 1.25 I
FB
R1
×
+
×
=
(EQ2)
VSU
1.25 IFB R1
×
+
=



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