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
(3.0VVIN5.5V). 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
kR
D
mAI
mAI
D
kR
SET
LED
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

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: MIC4801YM

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