Microchip MIC2111A Bruksanvisning
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MIC2111A
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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:
• V
IN
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 V
IN
operating voltage of the MIC2111B evaluation board is
16V.
Ordering Information
Part Number Description
MIC2111BYMT 1MIC21 1B Evaluation Board
Produkspesifikasjoner
| Merke: | Microchip |
| Kategori: | Ikke kategorisert |
| Modell: | MIC2111A |
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