Microchip MIC2299-15YML Manual

Microchip Ikke kategoriseret MIC2299-15YML

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Side 1/7

MIC2299 Evaluation Board

3.5A I

SWMIN

, 2MHz, High Power LED

Driver w/ 3 Preset LED Current Settings

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

408

) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

September 2007 M9999-092707-A

General Description

This board enables the evaluation of the 3.5A switch, High

Power white LED driver MIC2299. The board includes

components necessary to set the LED current to 20%,

50% and 100% of the nominal LED current (1A). The

external inputs also allow this to be programmed either

with additional resistors or voltages on the DIM or BRT

pins. A load disconnect switch prevents leakage and

protects the battery against short circuits while in

shutdown mode.

The evaluation board includes a push button switch which

sends a one shot pulse of 300ms to the enable pin to

prevent overheating when testing high power LEDs. Also

the enable pin can be driven to force the part into low Iq

mode.

The MIC2299, 2 MHz, Integrated Step-Up current

regulator, allows the use of small and very few external

components to create a compact boosted supply up to

13.5V with a core component footprint of just 0.25in

(1.61cm

). The evaluation board has been configured with

3 fixed current settings chosen using JP1 and all externally

programmable inputs are accessible via board pins.

Requirements

The MIC2299 evaluation board requires an input power

source that is able to deliver at least 5A over the desired

input voltage range. For the load, an electronic load (E-

Load) capable of constant voltage testing is required or a

high power LED mounted on a fan cooled heat sink. Note

that stability measurements must be carried out on an LED

load as E-Loads do not have the same dynamic

characteristics of a high power LED.

Precautions

The evaluation board does not have reverse polarity

protection. Applying a negative voltage to the VIN (J1)

terminal may damage the device.

The load current is only regulated if connected between

VOUT and FB terminals, the GND terminal close to the

VOUT terminal is provided for voltage measurements only.

The MIC2299 has a maximum input voltage rating of 10V

therefore the supply voltage should never exceed this

value.

Getting Started

1. Connect the input supply to the input terminals.

Take note of the polarity to prevent damage. An

ammeter can be used in-line with the VIN terminal

to measure input current. The Input voltage should

be measured at the input terminals to account for

any drops in test leads and amp meter.

2. Ensuring the jumper JP1 is at the left position

(50% load), connect the load to the output

terminals: +VO connects to the positive E-Load

input or Anode of the test LEDs, FB connects to

the negative E-Load input or the Cathode of the

test LEDs.

A low impedance ammeter can be connected in-

line with the +VO terminal for current

measurements. The output voltage should be

measured between the evaluation board terminals

+VO and GND (to measure converter efficiency) or

+VO and FB (to measure the voltage of the LED

load).

3. Switch on the E-Load (if using), then the input

supply. Measurements can now be taken of

efficiency, switching waveform and output current

regulation. When testing 1A load (JP1 open),

ensure that these are pulse tests only to prevent

damage to the LED. LED manufacturers

recommend <10% duty cycle and 3s period.

Ordering Information

Part Number Description

MIC2299-15YML EV Evaluation Board with MIC2299YML

15V OVP Device

Micrel, Inc. MIC2299 Evaluation Board

September 2007

2 M9999-092707-A

Evaluation Board

Board Description

By default, the board is set to give 500mA nominal current

into 2 series connected Power LEDs (JP1 at pre-FLSH

position). If the load is not present, the over voltage

protection (OVP) will limit V

OUT

to prevent damage to

output devices. JP1 can be removed to set the load

current higher to 1A (Flash) or moved to pins 1-2 to set a

lower 200mA current (Torch). Care should be taken as

removing the jumper sets the maximum current of 1A.

The push button switch is set to give a nominal 300ms

pulse to the load to prevent damage to external LEDs. For

testing continuous loading at lower currents, this mono-

stable can be bypassed by driving the EN terminal with a

voltage source above the enable threshold level.

The external pins can be driven to set any current between

the minimum and maximum values. See table. The

nominal current setting can be reduced by choosing a

larger value for R1 (current sense resistor). The 100%

current level can be set by using the following equation:

LED100%

= 0.2/R1

The values in the table will scale with the nominal 100%

current setting. So for example, if the 100% current is set

to 500mA, 0Ω on BRT will set LED current to 100mA,

50kΩ to 250mA etc.

DIM Voltage LED Current

RBRT = Open 40mA to 1A

0V to 200mV RBRT = GND 0 to 200mA

RBRT Voltage LED Current

0V to 1V 200mA to 1A

RBRT Resistance LED Current

0Ω to 100kΩ 200mA to 1A

Board Performance

High Power White LED Driver

100

2.5 3 3.5 4 4.5 5 5.5 6 6.5

SUPPLY VOLTAGE (V)

Efficiency VLED = 9V

LED

- 0.4A

LED

- 0.2A

-50

-40

-30

-20

-10

1 10 100 1000

FREQUENCY (kHz)

Bode Plot 2.2µH

(1A LED Load)

-180

-144

-108

-72

-36

108

144

180

Gain (3V

)

Gain (4.2V

)

Phase (3V

)

Phase (4.2V

)

Efficiency Stability 2.2µH Inductor

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MIC2299-15YML

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