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AS3693B
7.1.1
Feedback Selection
austria micro systems
In the AS3693B, each led – string feedback can be assigned to the specific led-supply, to minimize the power
consumption in the system. It can be chosen in between FBR, FBG and FBB.
DCDC Converter
for VDD
From main
supply
(Internal or externa)l
R1
Voltage Feedback
input for DCDC
V fb
R2
R3
C1
Feedback resistor divider
(part of DCDC converter circuit)
AS3693B
ANALOG REGULATION
CIRCUIT
16 REGULATORS
3...16
2
1
FB R
FB G
FB B
NOFB
VC
SHORTLED
VSL
OPENLED
VOL
REF
R5
Table 7 – Feedback Selection
Addr: 05h,06h,07h,08h
Feedback Select 1-4
This register controls the Feedback of the Automatic feedback loop
Bit
1:0
3:2
5:4
7:6
Bit Name
FB1_Select
FB5_Select
FB9_Select
FB13_Select
FB2_Select
FB6_Select
FB10_Select
FB14_Select
FB3_Select
FB7_Select
FB11_Select
FB15_Select
FB4_Select
FB8_Select
FB12_Select
FB16_Select
Default
00
01
01
10
Access
R/W
R/W
R/W
R/W
Description
Selects the feedback of the voltage regulators
00= regulator on FBR
01= regulator on FBG
10= regulator on FBB
11= regulator not connected to FB
Selects the feedback of the voltage regulators
00= regulator on FBR
01= regulator on FBG
10= regulator on FBB
11= regulator not connected to FB
Selects the feedback of the voltage regulators
00= regulator on FBR
01= regulator on FBG
10= regulator on FBB
11= regulator not connected to FB
Selects the feedback of the voltage regulators
00= regulator on FBR
01= regulator on FBG
10= regulator on FBB
11= regulator not connected to FB
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Revision 1.21 / 2011-09-30
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