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AS3693B
austria micro systems
7
Block Description
7.1 Feedback Circuit
The AS3693B supports a flexible feedback selection for external DCDC – supplies. Beside the default setup for
RGGB lighting, each channel can be assigned to an external DCDC feedback loop. This feedback circuit is
important to reduce power dissipation of the device.
Table 6 – Feedback Control
Addr: 04h
Feedback control
Enables and Disables the Different Feedback modes
Bit
0
1
Bit Name
Feedback on
Feedback on PWM
Default
1
0
Access
R/W
R/W
Description
1 = Feedback Circuit is active
0 = The entire Feedback Loop is disabled
0 = The Feedback Regulator is always active
1 = The Feedback Regulator is only active, if PWM = 1
Enables open Led Detection Comparators
2
Open_Led_Det_on
0
R/W
0 = Open Led Detection Disabled
1 = Open Led Detection Enabled, Level: Ucurrx = 50mV
Enables Short detection
3
Short_det_on
0
R/W
0 = Short detection off
1 = Sort detection on.
5:4
Short Led Detect
Voltage(VSL)
R/W
Short led Detection Trip Voltage ( debounced 3mS )
00 = 2V
01 = 3V
Trip Point voltage of the DCDC-Feedback Regulation
Circuit. (NOTE: This value has to be adjusted if Analog
7:6
DCDC_Regulation_tri
p Point (VC)
00
R/W
Ref select Bit is changed.)
00 = 0.5V (Note use for Currents up to 70 mA)
01 = 0.6V (Note use for Currents up to 80 mA)
10 = 0.8V (Note use for Currents up to 110 mA)
11 = 1.0V (Note use for Currents up to 150 mA)
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Revision 1.21 / 2011-09-30
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