Microchip MIC4801YM Manual

Microchip Ikke kategoriseret MIC4801YM

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Side 1/5

MIC4801 Evaluation Board

High Efficiency 600mA Single Channel

Linear WLED Driver with

Ultra Fast PWM™ Control

Ultra Fast PWM is a trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

General Description

The MIC4801 is a high efficiency, single channel, White

LED (WLED) driver. This constant current linear device is

designed to drive a single high power WLED up to 600mA

and features a low dropout of 130mV at 400mA (typical).

Brightness is controlled through an Ultra Fast PWM™

interface which can operate from 1% to 100% duty cycle.

The MIC4801 is available in an 8-pin SOIC leaded

package with a junction temperature range of -40°C to

+125°C

Requirements

The MIC4801 evaluation board requires a power supply

that is capable of delivering at least 1A while providing an

input voltage between 3.0V and 5.5V.

Precautions

The MIC4801 evaluation board is designed for an input

voltage no greater than 6V. This evaluation board does not

have reverse polarity protection; hence, applying a

negative voltage to the VIN terminal may damage the

device.

Getting Started

1. Connect an external supply to VIN. Apply the

desired input voltage across VIN and ground

terminals, J2 and J3, respectively, paying careful

attention to polarity and supply voltage

(3.0VVIN5.5V). An ammeter may be placed

between the input supply and the VIN terminal to

the evaluation board. Ensure that the supply

voltage is monitored at the VIN terminal. The

ammeter and/or power lead resistance can reduce

the voltage supplied to the input. VBAT is

connected to VIN through a 0 resistor, R1.

2. Enable/Disable the MIC4801

To enable the device, apply a DC voltage of 1.2V or

greater to the EN pin. This allows for full brightness of

the WLED (100% duty cycle). The EN pin can also be

used for dimming by connecting a PWM signal and

varying its duty cycle (please refer to the Ultra Fast

PWM™ Dimming Interface Section in datasheet).

Pulling EN low for more than 40ms forces the

MIC4801 into a low IQ sleep mode. Do not leave the

EN pin floating as this may cause an indeterminate output

state. A pull up resistor of 10k is placed from EN (JP1)

to VIN to ensure that the WLED is ON when an input signal

is applied.

3. Setting LED current with RSET resistor.

The average LED current may be calculated using the

equation below:

( )

140.0)(

4920

)(

140.0

)(

4920

)(

−Ω

⋅

=Ω

mAI

SET

LED

SET

D is the duty cycle of the LED current during PWM

dimming; D=1 when device is fully ON. The stock

evaluation board uses an RSET value of 12.1k which

corresponds to ILED of 411mA.

4. Measuring WLED current.

To measure WLED current, simply insert an ammeter

in series with the WLED(s). Keep in mind that a series

ammeter will add a small voltage drop, so the voltage

at the WLED terminal, D1, should be used when

making dropout measurements with a series ammeter.

Ordering Information

Part Number Description

MIC4801YM EV Evaluation board with the Single

Channel MIC4801 device

March 2011 M9999-032111-B

Micrel, Inc. MIC4801 Evaluation Board

March 2011 2 M9999-032111-B

MIC4801 Evaluation Board Schematic

MIC4801

2.2µF

VIN

RSET

GND

LED1

0Ω

open

10kΩ

12.1kΩ

VIN

RSET

J4 D1

GND

open

JP1

Bill of Materials

Item Part Number Manufacturer Description Qty.

C1608X5R0J225K TDK(1)

06036D225KAT2A AVX

(2)

GRM188R60J225KE19D Murata(3)

VJ0603G225KXYAT Vishay(4)

CL10B225KQ8NNNC Samsung(5)

Ceramic Capacitor, 2.2µF, 6.3V, X5R, Size 0603 1

C2 Open 1

R1 CRCW06030000FKEA Vishay

Resistor, 0Ω, 1%, 1/16W, Size 0603 1

R2 open

R3 CRCW060310K0FKEA Vishay

Resistor, 10kΩ, 1%, 1/16W, Size 0603 1

R4 CRCW060312K1FKEA Vishay Resistor, 12.1kΩ, 1%, 1/16W, Size 0603 1

LED1 W42180 Seoul Semiconductor(6) 3.8W High Power WLED 1

U1 MIC4801YM Micrel, Inc.(7) 600mA Single Channel Ultra Fast PWM™

Linear WLED Driver 1

Notes:

1. TDK: www.tdk.com

2. AVX: www.avx.com

3. Murata: www.murata.com

4. Vishay: www.vishay.com

5. Samsung: www.samsung.com

6. Seoul Semiconductor: www.seoulsemicon.com

7. Micrel, Inc.: www.micrel.com

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MIC4801YM

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