MIC2297-42YML EV Micrel, MIC2297-42YML EV Datasheet

MIC2297-42YML EV

Manufacturer Part Number

MIC2297-42YML EV

Description

Power Management IC Development Tools 1.2MHz 1.2A PWM Boost Converter - Evaluation Board

Manufacturer

Micrel

Type

PWM Controllersr

Datasheet

1.MIC2297-42YML_EV.pdf (6 pages)

Specifications of MIC2297-42YML EV

Product

Evaluation Boards

Tool Is For Evaluation Of

MIC2297

Input Voltage

2.5 V to 10 V

Output Voltage

42 V

Description/function

Evaluation Board

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

- 40 C

Output Current

1.2 A

For Use With

MIC2297

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Download datasheet (185Kb)

General Description

The MIC2297 is a 600kHz PWM White LED Driver

optimized for 6 to 10 series WLEDs. With an output

voltage of up to 42V and a guaranteed 1.2A on the internal

power switch, the MIC2297 can easily drive 10 WLEDs at

20mA continuous current. The MIC2297 features WLED

brightness control using the BRT pin and has output over

voltage protection (OVP) to protect the device in case the

WLEDs are disconnected unexpectedly. Available in a tiny

10-pin 2.5mm x 2.5mm x 0.85mm MLF

MIC2297 solution only requires a total of 6 external

components.

The MIC2297 operates at a default (BRT pin is open)

feedback voltage of only 200mV. The low feedback

voltage reduces the power dissipation from the external

current

efficiency.

When brightness control is required, the MIC2297 features

brightness control by applying a DC voltage to the BRT

pin. When applying a DC voltage to the BRT pin, the

feedback voltage is equal to the BRT voltage divided by 5.

This feature essentially increases or decreases the

feedback voltage from its default value (200mV), changing

the WLED current to control the WLED brightness.

Alternatively, a PWM signal may also be applied to the

BRT pin for brightness control. When a PWM signal (1kHz

recommended) is applied to the BRT pin, the WLEDs are

dimmed depending on the duty cycle and the peak voltage

of the signal. The PWM frequency can range from 1kHz to

1MHz. The selected PWM frequency does not affect the

WLED brightness. Assuming a 1V PWM signal is applied,

as the duty cycle decreases, the feedback voltage

decreases, thus reducing the WLED current.

Requirements

The MIC2297 evaluation board requires an input power

source that is capable of delivering greater than 1.2A at

2.5V.

Precautions

The evaluation board does not have reverse polarity

protection. Applying a negative voltage to the V

may damage the device.

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

May 2008

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

set

resistor

and

increases

total

package, the

operating

terminal

The MIC2297 evaluation board is tailored for a single or

dual Li-Ion input source. The input voltage should never

exceed 10V.

Getting Started

Note: For detailed specifications, please refer to the

MIC2297 Datasheet at www.micrel.com.

Ordering Information

408

MIC2297-42YML EV

600kHz 42V OVP PWM White LED Driver

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

1. Connect an external supply to V

2. Enable/Disable the MIC2297. To enable the

3. DCV

4. PWM

Part Number

input voltage to the V

terminals of the evaluation board, paying careful

attention to polarity and supply voltage (2.5V ≤ V

≤ 10V). An ammeter may be placed between the

input supply and the V

evaluation board to accurately monitor the input

current.

resistance can reduce the voltage supplied to the

input; therefore, the supply voltage at the V

terminal should be monitored.

MIC2297, apply a 1.5V or greater voltage signal to

the EN (J2) terminal. To disable the device, pull

the EN (J2) pin below 0.4V. The evaluation board

is configured with a jumper (JP1) from V

enable pin and a 10k pull-down resistor to ground

to conveniently turn the part on or off. Connecting

the jumper (JP1) will enable the MIC2297, while

removing the jumper will disable the part.

brightness with a DC voltage, see the DVC

Brightness Control section.

brightness with a PWM Signal, see the PWM

Brightness Control section.

MIC2297 Evaluation Board

Brightness

The

ammeter

Evaluation board with the

Control.

MIC2297 42V device

Description

(J1) and ground (J4)

and/or

(J1) terminal to the

M9999-053008-A

. Apply desired

power

control

to the

lead

(J1)

the

Related parts for MIC2297-42YML EV

MIC2297-42YML EV Summary of contents

Page 1

... PWM brightness with a PWM Signal, see the PWM Brightness Control section. Note: For detailed specifications, please refer to the MIC2297 Datasheet at www.micrel.com. Ordering Information Part Number MIC2297-42YML EV terminal IN 408 ) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com . Apply desired IN (J1) and ground (J4) ...

Page 2

... LED Similarly, if the V V can be calculated by: FB The I LED With PWM brightness control, the MIC2297 has great versatility since brightness may be set anywhere from 0 to 100 percent. Refer to the following figures for reference. = 20mA LED 2 MIC2297 Evaluation Board TIME (400µs/div) Figure 2 ...

Page 3

... DC voltage to the BRT pin. In this instance, Figure 7 is exactly the same as Figure 1. = 40mV 4mA LED Figure 7. Duty Cycle = 100 100mV 10mA LED 3 MIC2297 Evaluation Board TIME (400µs/div) = 160mV 16mA FB LED PEAK TIME (400µs/div) = 200mV 20mA ...

Page 4

... Coilcraft 22µH, 720mA I (2) Vishay 10KΩ, 1%, 1/16W, Size 0603 (2) Vishay 10Ω, 1%, 1/16W, Size 0603 (2) Vishay 20mA Standard SMD LED PLCC-2 (6) Micrel 600kHz 40V PWM White LED Driver 4 MIC2297 Evaluation Board JP2 D1 D6 JP3 D10 R2 Open R3 I LED ...

Page 5

... Micrel, Inc. PCB Layout Recommendations May 2008 Top Layer Bottom Layer 5 MIC2297 Evaluation Board M9999-053008-A ...

Page 6

... Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully May 2008 indemnify Micrel for any damages resulting from such use or sale. © 2008 Micrel, Incorporated. 6 MIC2297 Evaluation Board M9999-053008-A ...

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