Microchip MIC26603 Handleiding

Microchip Niet gecategoriseerd MIC26603

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MIC26603 Evaluation Board
28V, 6A HyperLight LoadÂŽ
Synchronous DC-DC Buck Regulator
SuperSwitcher IIG™
Hyper Light Load and Hyper Speed Control are trademarks of Micrel, Inc.
MLF and Lead Frame are registered trademarks of Amkor Technology, Inc.Micro
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( 408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2011 M9999-071511-A
er
lat
t current. The output voltage is a
th
he
e
rov
sp
m
un
fr
TON ripp
r
er-sag condi
rt feature is provided to reduce th
sh
tio of the IC
ns
et and supporting documentation
General Description
The MIC26603 DC-DC regulator operates ov
supply range of 4.5V to 28V and provides a regu
at up to 6A of outpu
an input
ed output
djustable
e device
switching
to 0.8V with a typical accuracy of Âą1%, and
operates at a switching frequency of 600kHz. T
frequency remains fairly constant with chang
voltage and output load.
Micrel’s Hyper Light L
s in input
ides the
onse as
edium to
der light
equency,
oad™ architecture p
same high-efficiency and ultra-fast transient re
the Hyper Speed Control™ architecture under
heavy loads, but also maintains high efficiency
load conditions by transitioning to variable
discontinuous mode operation.
The MIC26603 utilizes an adaptive le control
ovided to
tions. An
e inrush
ort-circuit
architecture. An undervoltage lockout feature is p
ensure proper operation under pow
internal soft-sta
current. Foldback current limit and “hiccup” mode
protection and thermal shutdown ensures protec
during fault conditions.
Note: This evaluation board is for 6A applicatio
n
.
The datashe can be
found on Micrel’s web site at: www.micrel.com.
Requirements
The MIC26603 provides a 5V regulated outp
voltage VIN ranging from 5.5V to 28V. When
ut for input
VIN < 5.5V,
VDD should be tied to PVIN pins to bypass the internal
linear regulator by a jumper. The output load can either be
an active or passive load.
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 MIC26603 evaluation board is
28V. Exceeding 29V on VIN could damage the device
capacitance and also makes (High VIN)/(Low VOUT).
ly to the VIN terminal.
e to the VIN and ground
board, paying careful
ly voltage. An ammeter
d ut supply and the VIN
oard. Ensure that the
at the VIN terminal. The
resistance can reduce
put.
e VOUT and ground
ither passive (resistive)
load). An ammeter can
and the V OUT terminal.
s monitored at the
set to 0.9V, 1.0V, 1.2V,
5.0V by a jumper. If a
it can be adjusted by
ck resistors. See “Output
” section.
th 03. The EN pin is provided on
th e MIC26603
tu DD the UVLO threshold.
The output of the MIC26603 may be turned off by
shorting the EN pin to ground. A connection on the
board provides easy access to the enable pin.
Ordering Information
Part Number Description
Getting Started
1. Connect an external supp
Apply the desired input voltag
terminals of the evaluation
attention to polarity and supp
may be place between the inp
terminal to the evaluation b
supply voltage is monitored
ammeter and/or power lead
the voltage supplied to the in
2. Connect the load to th
terminals. The load can be e
or active (as in an electronic
be placed between the load
Ensure that the output voltage i
VOUT terminal. VOUT can be
1.5V, 1.8V, 2.5V, 3.3V, or
different voltage is needed,
changing the feedba
Voltage
3. Enable e MIC266
ation boarde evalu . The output of th
rns on when V exceeds
MIC26603YJL EV 6A HLL DC-DC Regulator Evaluation
Board
Micrel, Inc. MIC26603 10 A Evaluation Board
July 2011 2 M9999--071511-A
ion board is
feedback re s
and one of R5, R6, R7, R8, R9, R10, R11, or
can be calculated as follows as n example:
Output Voltage
The output voltage on the MIC26603 evaluat
adjustable. It is set by adjusting the sistor (R4
) and R12
a
)
R7
where VREF = 0.8V.
The output voltage above is set at the factor
R4
(1
REF
V
OUT
V+×=
y for a 1.2V
output, but it can easily be changed by moving the jumper
to a respective position to get an indicated voltage on the
board. If a desired voltage is not shown on the board, it is
easily modified by removing R4 and R7 and replacing
them with the values that yield the desired output voltage.
Once R4 is selec d, R7 can be calculated using: te
REF
V
OUT
V
REF
VR4
R7 −
×
=
For VREF = 0.8V:
0.8V
OUT
V
0. R4
R7 −
×
=8V
The output voltage should not be set to exceed 5V due to
the 6.3V rating of the output capacitor and limitation on line
regulation. Please refer to the MIC26603 datasheet
“Setting Output Voltage” section for more information.
Micrel, Inc. MIC26603 10 A Evaluation Board
July 2011 3 M9999--071511-A
Evaluation Board Performance
Efficiency (V
IN
= 5V)
vs. Output Current
50
55
60
65
70
75
80
85
90
95
100
0 1 2 3 4 5 6 7 8
OUTPUT CURRENT (A)
EFFICIENCY (%)
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
V
IN
= 5V
Efficiency (V
IN
= 12V)
vs. Output Current
50
55
60
65
70
75
80
85
90
95
100
0 1 2 3 4 5 6 7 8
OUTPUT CURRENT (A)
EFFICIENCY (%)
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
Efficiency (V
IN
= 24V)
vs. Output Current
50
55
60
65
70
75
80
85
90
95
012345678
OUTPUT CURRENT (A)
EFFICIENCY (%)
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
Thermal Derating*
vs. Ambient Temperature
0
2
4
UTPUT
Thermal Derating*
vs. Ambient Temperature
0
2
6
8
10
12
-50 -25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
O CURRENT (A)
V
IN
= 5V
V
OUT
= 1.8, 2.5, 3.3V
1.8V
3.3V
4
TPUT
6
8
10
12
-50 -25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
OU CURRENT (A)
5V
2.5V
V = 12V
Thermal Derating*
vs. Ambient Temperature
0
2
IN
V
OUT
= 2.5, 3.3, 5V
4
PUT
6
8
10
12
-50 -25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
OUT CURRENT (A)
V =
2.5V
IN
24V
V
OUT
= 0.8, 1.2, 2.5V
0.8V
Die Temperature* : The temperature measurement was taken at the hottest point on the MIC26603 case mounted on a 5 square inch 4 layer, 0.62”,
FR-4 PCB with 2oz finish copper weight per layer, see Thermal Measurement section. Actual results will depend upon the size of the PCB, ambient
temperature and proximity to other heat emitting components.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC26603

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