AS3675 datasheet(16/81 Pages) AMSCO

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AS3675

Datasheet - D e ta i l e d D e s c r i p t i o n

Table 11. DCDC control1

Addr: 21h

DCDC control1

This register controls the Step Up DC/DC Converter.

Bit

Bit Name

Default Access

Description

step_up_frequ

R/W

Defines the clock frequency of the Step Up DC/DC

Converter.

01MHz

500kHz

2:1

step_up_fb

R/W

Controls the feedback source if step_up_fb_auto = 0

DCDC_FB enabled (external resistor divider).

Set step_up_fb=00 (DCDC_FB)

CURR1 feedback enabled (feedback via LEDs)

CURR2 feedback enabled (feedback via LEDs)

CURR6 feedback enabled (feedback via LEDs)

7:3

step_up_vtuning

00000

R/W

Defines the tuning current at pin DCDC_FB.

00000

0 µA

00001

1 µA

00010

2 µA

....

10000

15 µA

.....

11111

31 µA

Table 12. DCDC control2

Addr: 22h

DCDC control2

This register controls the Step Up DC/DC Converter and low-voltage current

sinks CURR3x.

Bit

Bit Name

Default Access

Description

step_up_res

0R/W

Gain selection for Step Up DC/DC Converter

Select 0 if Step Up DC/DC Converter is used

with current feedback (CURR1, CURR2,

CURR6) or if DCDC_FB is used with current

feedback only – R2, C7, C8 connected, R3 not

used

Select 1 if DCDC_FB is used with external

resistor divider using 2 resistors: R2 and R3

skip_fast

0R/W

Step Up DC/DC Converter output voltage at low loads,

when pulse skipping is active

Accurate output voltage, more ripple

Elevated output voltage, less ripple

step_up_prot

1R/W

Step Up DC/DC Converter protection

No over voltage protection

Over voltage protection on pin DCDC_FB

enabled voltage limitation =1.25V on DCDC_FB

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