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AS3606 Datasheet(PDF) 20 Page - ams AG

Part No. AS3606
Description  System PMU with HV Back Light Driver
Download  71 Pages
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Maker  AMSCO [ams AG]
Homepage  http://www.ams.com
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AS3606 Datasheet(HTML) 20 Page - ams AG

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www.austriamicrosystems.com
Revision 1.03
19 - 70
AS3606 AS3607 2v2
Data Sheet - D e t a i l e d D e s c r i p t i o n - P o w e r M anage ment F uncti ons
8.3 30V Step-Up DCDC Converter
The integrated Step-Up DC/DC Converter is a high efficiency current-mode PWM regulator, providing an output voltage up to 30V. A constant
switching-frequency results in a low noise on supply and output voltages.
It has two programmable high voltage current sinks (0 to 38.25mA) for driving e.g. white LEDs as back-light. It can drive also unbalanced strings
due to the internal automatic feedback selection.
A voltage feedback mode allows generating constant supply voltages for e.g. OLEDs. The output voltage is set by an external resistor divider
and an internal current sink.
An internal protection circuit will shut down the regulator if the voltage on FBSU exceeds the over voltage threshold. No more external protection
has to be used to avoid an exceeding of the operation conditions in a no load situation.
Figure 10. DCDC15 Block Diagram
8.3.1 Voltage Feedback
Setting bit SU_CURR_FB = 0 enables voltage feedback at pin FBSU.
The output voltage is regulated to a constant value, given by (Bit SU_GAIN should be set to 1 in this configuration)
UStep up_out = (R1+R2)/R2 *1.25 + IFB * R1
(EQ 1)
If R2 is not used, the output voltage is by (Bit SU_GAIN should be set to 0 in this configuration)
UStep up_out = 1.25 + IFB * R1
(EQ 2)
Where:
UStep up_out = Step Up DC/DC Converter output voltage
R1 = Feedback resistor R1
R2 = Feedback resistor R2
IFB = Tuning current at pin FBSU; 0 to 31µA


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