Microchip MIC2111B Handleiding

Microchip Niet gecategoriseerd MIC2111B

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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) 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
Micrel, Inc.
MIC2111B Evaluation Board
October 1
4 , 2015 3 Revision 1.1
Evaluation Board Performance

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC2111B

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