AS3722 datasheet(125/199 Pages) AMSOSRAM

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Page 124

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[v1-01] 2015-Sep-07

AS3722 − Register Description

Figure 125:

SD1_control

Addr:2ah

SD1_control

Bit

Bit Name

Default

Access

Bit Description

7:6

sd1_trim_gm

RW_SM

Selects gm setting of OTA

0 : fast setting

1 : slow setting

2 : medium setting

3 : very slow setting

sd1_force_pwm

Selects force pwm mode

0 : normal mode

1 : force pwm, inverted coil current possible to

keep the fixed frequency

4sd1_fast

Selects a faster regulation mode for SD1

suitable

for larger load changes.

0 : normal mode, Cout (according spec)

1 : fast mode, 2 x Cout (according spec)

required

sd1_combine_phase

RW_SM

Selects phase mode (set during startup

power_stage test)

0 : normal mode

1 : combine phase 1 and 2

sd0_low_noise

Enables low noise mode of SD0. If enabled

smaller

current pulses and output ripple are activated

0 : Normal mode. Minimum current pulses of

about 10% the current limit are applied in skip

mode

1 : Low noise mode. Only minimum on time

applied in skip mode

sd1_low_noise

Enables low noise mode of SD1. If enabled

smaller

current pulses and output ripple is activated

0 : Normal mode. Minimum current pulses of

about 10% the current limit are applied in skip

mode

1 : Low noise mode. Only minimum on time

applied in skip mode

sd1_phases

RW_SM

Selects number of phases for sd1 (set during

startup power_stage test, can be changed after

that)

0 : 1 phase used

1 : 2 phases used

AS3722 Datasheet(PDF) 125 Page - ams-OSRAM AG

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