AS3688 datasheet(17/72 Pages) AMSOSRAM

17 / 72 page

AS3688

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (ptr,tje)

Revision 1.1.1 / 20060707

15 - 70

R3 = Feedback resistor R3.

R4 = Feedback resistor R4.

IDCDC_FB = Tuning current at pin 29 (DCDC_FB); 0 to 31µA.

Table

8 – Voltage Feedback Example Values

Ivtuning

Ustepup_out

µ A

R3 = 1MΩ, R4 not used

R3 = 500kΩ, R4 = 50kΩ

13.75

14.25

14.75

15.25

15.75

6.25

16.25

7.25

16.75

8.25

17.25

9.25

17.75

10.25

18.25

11.25

18.75

12.25

19.25

13.25

19.75

14.25

20.25

15.25

20.75

16.25

21.25

…

31.25

28.75

32.25

29.25

Caution:

The voltage on CURR1 and CURR2 must not exceed 15V – see also section ‘High Voltage Current

Sinks’.

7.2.4 PCB Layout Tips

To ensure good EMC performance of the DCDC converter, keep its external power components C2, R2, L1, Q1,

D1 and C9 close together. Connect the ground of C2, Q1 and C9 locally together and connect this path with a

single via to the main ground plane. This ensures that local high-frequency currents will not flow to the battery.

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