AS1163 datasheet(38/91 Pages) AMSOSRAM

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AS1163

Functional description

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6.6

LED driver

Each LED driver is implemented as an open-drain current sink.

A slope control circuit defines the steepness of the PWM turn-on and turn-off edges. A bias

circuit provides the DC bias current, where 5 levels are selected with a thermometric code.

Drivers are grouped in 3 channels with 3 drivers each. Channels are sized with a current

capability of respectively 48 mA (Channel 0), 24 mA (Channel 1), 24 mA (Channel 2).

Selectable current levels are 3 mA, 6 mA, 12 mA, 24 mA, 48 mA for Channel 0.

Selectable current levels are 1.5 mA, 3 mA, 6 mA, 12 mA, 24 mA for Channel 1 and Channel

Table 11: Current levels configuration table

CUR setting

Channel 0

3 mA

6 mA

12 mA

24 mA

48 mA

Channel 1

1.5 mA

3 mA

6 mA

12 mA

24 mA

Channel 2

1.5 mA

3 mA

6 mA

12 mA

24 mA

ILED_acc, ILED_mis parameters refer to the CUR setting 4, where trimming is performed. A

performance degradation for lower settings is to be expected.

The current drivers are controlled by a PWM with a frequency up to nominally 1000 Hz and a

PWM resolution (duty cycle) of 14-bit. Higher resolution of 15-bit is achieved with nominal

500 Hz frequency.

Enabling Dithering function allows to achieve 16-bit dynamic range (not available with Sync

functionality).

Current driver activation is performed with phase shift in digital to reduce the peak to average

power ratio.

The current of the drivers is stable over the full temperature range to avoid any

color/brightness shift. The LED dependencies over temperature can be compensated via PWM

adjustment depending on the readout value of the temperature sensor.

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