L5101-AG6-R datasheet(6/9 Pages) UTC

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L5101

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

6 of 9

www.unisonic.com.tw

QW-R103-026,A

APPLICATION INFORMATION

Recommended Component Selection

Inductor Selection:

A 10µH inductor is recommended for most applications.

Capacitor Selection:

The small size of ceramic capacitors (1µF input with 1µF output ) are sufficient, X5R

and X7R types are recommended

Diode Selection:

An Schottky diode rated at 100mA ~ 200mA is sufficient for most applications.

LED Current Control

A feedback resistor (precision 1% recommended) as feedback resistor control the LED current.(RFB in Figure 1)

- Feedback reference voltage : 95mV.

- LED current is 95mV/RFB.

- The formula for RFB selection : RFB=95mV/ILED

VIN

OVP

GND

SHDN

10μH

1μF

VIN

L5101

RFB

4.7Ω

1μF

RB521S-30

Fig.1 Dimming Control with a PWM Signal

Open-Circuit Protection

When a high output voltage exceeds maximum 33V, the built-in OVP (Over Voltage Protection) will be triggered to

prevent the damage resulting from an open circuit condition.

Dimming Control

There are three different ways of dimming control circuits as follows:

1. Using a PWM signal

VIN

OVP

GND

SHDN

1μF

VIN

L5101

RFB

4.7Ω

RB521S-30

PWM

1KΩ

51KΩ

10μH

Fig.2 Dimming Control Using a PWM Signal

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