MIC28510EV Datasheet, PDF (1/14 Pages) Micrel Semiconductor – 75V/4A Hyper Speed Control™ Synchronous DC/DC Buck Regulator

MIC28510 Evaluation Board
75V/4A Hyper Speed Control™
Synchronous DC/DC Buck Regulator
General Description
The MIC28510 DC/DC regulator operates over an
input supply range of 4.5V to 75V and provides a
regulated output at up to 4A of output current. The
output voltage is adjustable down to 0.8V with a
typical accuracy of ±1%. The switching frequency is
adjustable and once adjusted the switching frequency
remains fairly constant with changes in input voltage
and output load.
The basic parameters of the evaluation board are:
• Input Voltage − 5V to 75V
• Output Voltage − 0.8V to 5V at 4A⁽¹⁾
12V at up to 4A⁽²⁾
• 250kHz Switching Frequency
(Adjustable from 100kHz to 500kHz)
Notes:
1, 2. Refer to thermal de-rating curves shown in Typical
Characteristics section.
Datasheets and support documentation can be found
on Micrel’s web site at: www.micrel.com
Requirements
The MIC28510 evaluation board requires only a single
power supply with at least 10A current capability. A
linear regulator, which includes a Zener and an NPN
transistor, has been installed on the board to provide
housekeeping (V_DD) for the MIC28510. The output
load can either be a passive or an active load.
Precautions
The MIC28510 evaluation board does not have
reverse polarity protection. Applying a negative
voltage to the PVIN and GND terminals may damage
the device. The maximum PVIN of the board is rated
at 75V. Exceeding 75V on the PVIN could damage the
device.
Getting Started
1. V_IN Supply. Connect a power supply to the VIN
and GND terminals, paying careful attention to the
polarity and supply voltage range (5V < VIN <
75V). The input current IIN can be monitored with
a current meter. Do not apply power until Step 4.
2. Connect Load and Monitor Output. Connect a
load to the V_OUT and GND terminals. The load can
be either a passive (resistive) or an active (as in
an electronic load) type. A current meter may be
placed between the V_OUT terminal and load to
monitor the output current. Ensure the output
voltage is monitored at the V_OUT terminal.
3. Enable Input. The EN pin has an internal 100k
pull-up resistor to VDD, which allows the output to
be turned on when VDD exceeds its UVLO
threshold. An EN connector is provided on the
evaluation board for users to easily access the
enable feature. Applying an external logic signal
on the EN pin to pull it low or using a jumper to
short the EN pin to GND will shut off the output of
the MIC28510 evaluation board.
4. Turn On the Power. Turn on the VIN supply and
verify that the output voltage is regulated to 3.3V.
Ordering Information
Part Number
MIC28510 5V EV
MIC28510 12V EV
Description
Evaluation Board up to 5V Output
Evaluation Board 12V Output
Hyper Speed Control is a trademark of Micrel, Inc
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
March 2012
M9999-030712
[e-mail] or [phone]