tENTER + tBLANK

CTRL

LED

To Standby

T_TIMEOUT_L

Run once command

To Standby

tENTER + tBLANK

CTRL

LED

To Standby

T_TIMEOUT_H T_TIMEOUT_L

Run command

1st ON time

1st OFF time

CTRL

LED

2nd ON

time

t <

½*T_CYCLE_L

tENTER

To Standby

Blank period

LP5522

www.ti.com

SNVS488A – JUNE 2007 – REVISED MARCH 2013

LED TIMEOUT ON/OFF TIMES

When LP5522 is in training mode and CTRL signal is high longer than LED Timeout ON time, the ON time

counter saturates. In this case saturated ON time is recorded and LED OFF time capturing is started. At the

same time LED is switched off even if the CTRL signal is still high.

If ON time counter has saturated, LED OFF time recording is terminated either by giving a Train End command

or setting the CTRL signal to low and back to high. Setting the CTRL signal back to high records the LED OFF

time and starts next ON time capturing.

If anyhow CTRL is still high after the LED Timeout OFF time has been elapsed the OFF time counter saturates

and saturated OFF time is recorded. After that chip waits the CTRL signal to go low which cause the chip to go

Standby.

LED OFF time counter can saturate also if Training end command is not given or no new ON time has been

started. In this case saturated OFF time is recorded and chip goes to Standby.

Copyright © 2007–2013, Texas Instruments Incorporated

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