LP5522 datasheet(11/17 Pages) TI1

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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

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

INPUT CAPACITOR, CIN

Although not required for normal operation, a capacitor can be added to VIN to reduce line noise. A surface-

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

characteristic are preferred.

CURRENT SET RESISTOR, RISET

If other than 5 mA current is required, RISET resistor can be used to adjust the current. For 20 mA current 24 kΩ

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

recommended.

LED

Forward voltage of LED must be less than minimum input voltage minus minimum headroom voltage (VHR). For

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

CIN

VDD Bypass Capacitor

100

Ceramic, X7R or X5R

RISET

Current Set Resistor for 20 mA LED Current

Ω

LED

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