Microchip MIC2111B Handleiding

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High--Mode, Performance, Multi

Step-Down Controller

MIC2111B Evaluation Board

Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 9440800 • fax + 1 (408) 4741000 • San --http://www.micrel.com

October 201514,

Revision 1.1

General Description

The MIC2111B is a programmable-frequency, valley-

current/voltage-mode PWM controller that provides the

control and protection features necessary for power

devices and drivers that use currentsensing across the -

inductor. The MIC2111B provides a single tristate PWM -

logic signal to DrMOS modules to realize low output

voltage, high current power supply. The device has

precision enable and power good (PG) functions for the

sequencing of multiple power supplies. In addition, the

solution is compatible with intelligent power stages in a

high-- current, stepdown DC/DC converter.

The MIC2111B evaluation board operates over an input

supply range of 5.5V to 16V and provides a regulated

output at up to 20A of load current. The output voltage is

adjustable down to 0.6V with a typical accuracy of ±1%.

The evaluation board operates at a switching frequency of

500kHz, in valley current mode.

The MIC2111B utilizes a programmable control

architecture. The MIC2111B evaluation board is

configured for valley current mode control. An

undervoltage lockout feature is provided to ensure proper

operation under power sag conditions. An adjustable soft-

start feature is provided to reduce inrush current. An

adjustable currentlimit is provided. “Hiccup” mode short--

circuit protection and thermal shutdown ensures protection

of the IC during fault conditions.

The basic parameters of the evaluation board are:

•VIN supply: 5.5V to 16V

• Output: 1.2V at 20A

•500kHz switching frequency (Adjustable from

200kHz to 2MHz)

•Control mode: Valley current mode (Adjustable to

voltage mode)

The customer can configure the MIC2111B evaluation

board to operate in voltage mode through the following

jumper selections.

Control Mode P1 P2

Valley Current

Mode

Pins 1Pins 1-2 -2

Voltage Mode -3 OPEN Pins 2

For information about compensation component selection,

see the MIC2111 datasheet on Micrel’s website at:

www.micrel.com.

Requirements

The MIC2111B evaluation board requires only a single

power supply with at least 10A current capability. The

MIC2111B has board 5V LDO to power the internal an on-

biasing of the MIC2111B IC and DrMOS gate drive supply.

Power-up Precautions

The evaluation board does not have reverse polarity

protection. Applying a negative voltage to the VIN terminal

may damage the device. In addition, the maximum VIN

operating voltage of the MIC2111B evaluation board is

16V.

Ordering Information

Part Number Description

MIC2111BYMT 1MIC211B Evaluation Board

Product specificaties