MIC28500 2A EV Micrel, MIC28500 2A EV Datasheet - Page 2

• Manufacturer Part Number: MIC28500 2A EV
• Description: Power Management IC Development Tools 75V/4A DC-DC Buck Regulator with HSC - Evaluation Board
• Manufacturer: Micrel
• Type: DC/DC Converters, Regulators & Controllersr

Specifications of MIC28500 2A EV

• Product: Evaluation Boards
• Tool Is For Evaluation Of: MIC28500
• Input Voltage: 30 V to 75 V
• Output Voltage: 12 V
• Description/function: Evaluation Board
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Output Current: 2 A
• For Use With: MIC28500

July 2011
Features
Feedback Resistors
The output
board, which is preset to 3.3V, is determined by the
feedback divider:
where V
R8, R9, R10, R11, R12, which corresponds to 0.9V,
1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, or 5V. Leaving the
R
voltages not listed above can be set by modifying
R
Note that the output voltage should not be set to
exceed
output capacitors.
If higher than 5V output is desired, it is reco
to use the designs sho
output cap
12V/2A ou
SW Node
Test point J11 (VS
switching
waveforms for the converter.
Current Limit
The MIC28500 has internal FETs, and the current limit
is implemented by sensing the R
The MIC28500 has a fixed current limit of 7A (TYP).
Loop Gain Measurement
The resistor, R13, is placed in series with the regulator
feedback path. The control loop gain can be
measured by connecting an impedance analyzer
across the resistor and selecting the resistor value in
between 20
BOTTOM
BOTTOM
REF
R
V
value according to:
5V due to the 6.3V voltage rating on the
open gives a 0.
OUT
BOTTOM
tput.
acitors, L1, R3 and R17 are optimized for
Ω
= 0.8V, and R
waveform,
voltage on the MIC28500 evaluation
to 50
=
V
REF
=
Ω
.
W) is placed for monitoring the
V
×
R4 ×
OUT
⎛
⎜
⎜
⎝
one
1
wn in Figure 2, where the
8V
+
BOTTOM
−
V
R
REF
V
output voltage. All other
BOTTOM
REF
of
R4
is one of R
DS-ON
the
⎞
⎟
⎟
⎠
of bottom FET.
most
5, R6, R7,
mmended
critical
2
[e-mail]
or [phone]
M9999-071911