Microchip MIC2111A Manual

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Side 1/8

High- -Mode, Performance, Multi

Step-Down Controller

MIC2111B Evaluation Board

Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 944 0800 • fax + 1 (408) 474 1000 • 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 current sensing across the -

inductor. The MIC2111B provides a single tri state 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, step down 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 current limit 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 1 Pins 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 1MIC21 1B Evaluation Board

Micrel, Inc.

MIC2111B Evaluation Board

October 1

4 , 2015 2 Revision 1.1

Getting Started

1. Connect a supply to the VIN and GND terminals.

Pay careful attention to the polarity and the supply

range (5.5V < VIN < 16V). 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. Do not apply power until Step 4.

2. Connect the load to the VOUT and ground

terminals.

The load can be either passive (resistive) or active (as

in an electronic load). An ammeter can be placed

between the load and the VOUT terminal. Ensure that

the output voltage is monitored at the VOUT terminal.

3. Enable input.

An EN connector is provided on the evaluation board

for users to easily access the enable feature. The

output of the MIC2111B turns on when VCC exceeds

the UVLO threshold. The output of the MIC2111B

evaluation board may be turned off by shorting the EN

pin to ground.

4. Turn on the power.

Turn on the VIN power supply and verify that the

output voltage is regulated to 1.2V.

Evaluation Board Description

Output Voltage

The output voltage on the MIC2111B evaluation board is

adjustable. It is set by adjusting the feedback resistors and

using the following equation.

 = + 󰇡 

󰇢

Eq. 1

where VFB = 0.6V and R11 is 4.99kΩfor a 1.2V output

voltage. Leaving R11 open gives a 0.6V output voltage.

The output can be adjusted from 0.6V to 3.46V by

changing the value of R11 according to the equation

above.

The output voltage should not be set in excess of 3.46V

due to the need for headroom for the current sense

amplifier of MIC2111B. Please refer to the Application

Information section of the MIC2111 datasheet for setting

the output voltage.

Oscillator Frequency

The MIC2111 has an internal oscillator by which the

frequency can be set through an external resistor at the

FREQ pin. The switching frequency can be programmed

from 200kHz to 2MHz by using the following equation.

RFREQ = 

[ ] Eq. 2

where FSW = the desired switching frequency in Hz.

Soft Start/Soft- -Stop (SS)

The MIC2111 has digital soft stop (SS) to avoid - -start/soft

high inrush current in the input supply lines. The soft-start

time can be programmed with an external resistor

con trates nected from the SS pin to GND. Table 1 illus

resistor values and soft stop time is - s -start time . Soft the

same as programmed soft start time (contact the - the

factory stop). for instructions on disabling soft-

Table 1 - . Soft Start Programming

E96 Range Resistance

Soft-Start

6.19k 64Ω µs

19.1k 128Ω µs

30.9k 256Ω µs

44.2k 512Ω µs

56.2k 768Ω µs

68.1k 1024Ω µs

80.6k 1536Ω µs

93.1k 2048Ω µs

105k 3072Ω µs

118k 4096Ω µs

130k 6144Ω µs

143k 8192Ω µs

154k 16384Ω µs

169k 24576Ω µs

182k 32768Ω µs

Open 2048 µs

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MIC2111A

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