CTRL

LED

To Standby

T_TIMEOUT_L

Run once command

To Standby

CTRL

LED

To Standby

T_TIMEOUT_H T_TIMEOUT_L

Run command

LP5522

www.ti.com

SNVS488 – JUNE 2007

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.

Recommended External Components

mount multi-layer ceramic capacitor (MLCC) is recommended. MLCCs with a X7R or X5R temperature

characteristic are preferred.

resistor is required. Accuracy of the resistor directly effects to the accuracy of the LED current. 1% or better is

recommended.

LED

example with 2.7V input voltage and 20 mA LED current the maximum LED forward voltage is 2.7V - 100 mV =

2.6V.

List of Recommended External Components

Symbol

Symbol Explanation

Value

Unit

Type

VDD Bypass Capacitor

100

nF

Ceramic, X7R or X5R

Current Set Resistor for 20 mA LED Current

24

k

Ω

1%

LED

User defined

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