Microchip MIC4812YMME Manual

Microchip Ikke kategoriseret MIC4812YMME

Læs gratis den danske manual til Microchip MIC4812YMME (4 sider) i kategorien Ikke kategoriseret. Denne vejledning er vurderet som hjælpsom af 11 personer og har en gennemsnitlig bedømmelse på 4.8 stjerner ud af 6 anmeldelser. Har du et spørgsmål om Microchip MIC4812YMME, eller vil du spørge andre brugere om produktet?

Download PDF

Side 1/4

MIC4812 Evaluation Board

High Current 6 Channel Linear WLED

Driver with DAM™ and Ultra Fast

PWM™ Control

Ultra Fast PWM and DAM™ Dynamic Averagie Matching are trademarks 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 MIC4812 is a high efficiency linear White LED

(WLED) driver; it is designed to drive up to six high current

WLEDs while maintaining constant current in each

channel. The MIC4812 features Dynamic Average

Matching™ (DAM™) which is specifically designed to

provide optimum matching across all WLEDs. These high

accuracy (±1% typical) current regulated WLED channels

ensure uniform display illumination under all conditions. A

typical dropout of 190mV at 100mA is expected.

The MIC4812 is available in a 10-pin Epad MSOP

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

+125°C.

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com

Requirements

The MIC4812 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 MIC4812 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, J1 and J2, 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.

2. Enable/Disable the MIC4812

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

greater to the EN pin (J3). This allows for full

brightness of the WLEDs (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 20ms forces

the MIC4811 into a low IQ sleep mode. Do not leave

the EN pin floating as this may cause an indeterminate

output state. A pull down resistor of 200kΩ is placed from

EN to GND to ensure that the WLEDs are OFF when an

enable signal is not applied.

3. Setting LED current with RSET resistor.

The average LED current may be calculated using the

equation below:

( )

139.0)(

820

)(

139.0

)(

820

)(

−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 8.25kΩ which

corresponds to ILED of 10mA.

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(s), D1-D6, should be used when

making dropout measurements with a series ammeter.

Ordering Information

Part Number Description

MIC4812YMME EV Evaluation board with Six Channel

WLED Driver

March 2011 M9999-032111-B

Micrel, Inc. MIC5337 Evaluation Board

March 2011 2 M9999-032111-B

MIC4812 Evaluation Board Schematic

Bill of Materials

Item Part Number Manufacturer Description Qty

C1608X5R0J225K TDK(1)

06036D225KAT2A AVX(2)

GRM188R60J225KE1

Murata(3)

VJ0603G225KXYAT Vishay(4)

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

LED1–

LED6

OVS5WBCR4 OPTEK Technology, Inc(5) WLED 6

R1 CRCW06038K25F5EA Vishay(4) Resistor, 8.25k, 1%, 1/16W, Size 0603 1

R2 CRCW06032003FKEA Vishay(4) Resistor, 200k, 1%, 1/16W, Size 0603 1

U1 MIC4812YMME Micrel, Inc.(6) High Current 6 Channel Linear WLED Driver

with DAM™ and Ultra Fast PWM™ Control 1

Notes:

1. TDK: www.tdk.com

2. AVX: www.avx.com

3. Murata: www.murata.com

4. Vishay: www.vishay.com

5. OPTEK: www.optekinc.com

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

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MIC4812YMME

Har du brug for hjælp?

Hvis du har brug for hjælp til Microchip MIC4812YMME stil et spørgsmål nedenfor, og andre brugere vil svare dig

Dit navn*

Din email*

Skriv dit spørgsmål her

Ikke kategoriseret Microchip Manualer

Microchip HS12-100D0/12DS2F Manual

18 Februar 2025

Microchip HSA0-040SDA/A0SA10 Manual

18 Februar 2025

Microchip HSA0-040SIA/A0S1F Manual

18 Februar 2025

Microchip HT12-100S0s/12ST25 Manual

17 Februar 2025

Microchip EMC2103-2 Manual

17 Februar 2025

Microchip EMC1047 Manual

17 Februar 2025

Microchip HCS201 Manual

17 Februar 2025

Microchip LE9653 Manual

17 Februar 2025

Microchip LAN7430 Manual

17 Februar 2025

Microchip HCS500 Manual

17 Februar 2025

Ikke kategoriseret Manualer

Nyeste Ikke kategoriseret Manualer

Planet XGPN-100 Manual

15 Juni 2025

Proficook PC-EKA 1283 Manual

15 Juni 2025

OmniMount OBSP8 Manual

15 Juni 2025

Levenhuk FS10 Manual

15 Juni 2025

Vestil PM4-2148-LP Manual

15 Juni 2025

ElectriQ STRV-W1-B Manual

15 Juni 2025

Adler AD 4521 Manual

15 Juni 2025

AMX HydraPort HPX-AV102 Manual

15 Juni 2025

Hughes & Kettner Red Box Mk II Manual

15 Juni 2025

Hughes & Kettner Quantum QC 412 Manual

15 Juni 2025