Microchip MIC23450-AAAYML Manual de Usario

Microchip No categorizado MIC23450-AAAYML

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MIC23450 Evaluation Board
3 , , MHz PWM 2A Triple Buck Regulator
with HyperLight Load
®
and Power Good
HyperLight Load is a trademark of Micrel, Inc.registered
MLF and LeadFrame are registered trademark Amkor Technology Inc.Micro
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( ) 944 0800 • fax + 1 (408) 474 1000 • 408 - - http://www.micrel.com
February 4, 2013
Revision 1.0
General Description
This board allows the customer to evaluate the
MIC23 output 3MHz450, a fully integrated, triple- - , 2A,
switching regulator that features HyperLight Load ® mode
and ood 450 power g (PG) output indicator . The MIC23s
is highly efficient throughout the output current range,
drawing just 23 A of quiescent cu for each channel µ rrent
in operation. The tiny 5mm x 5mm MLF® package saves
board space and requires few external components. The
MIC23450 provides 2.5% accuracy and± output voltage
each channel typically in less than 10 to a responds µs
load transient with output voltage ripple.as low as 5mV
Requirements
This board needs a single 40W bench power source,
adjustable from to 5.5 . The loads can 2.7V V be either
active (electronic load) or passive (re and must be sistor),
able to to dissipate 20W. It is ideal, but not essential,
have an oscilloscope available to view the circuit
waveforms. require oltage The simplest tests vtwo
meters to measure input and output voltage. Efficiency
measurements require oltage for a single channel vtwo
meters and meterstwo am to prevent errors caused by
measurement inaccuracies.
Precautions
There is no reverse input protection on this board. Be
careful make when connecting the input source to sure
correct polarity is observed.
Getting Started
1. Connect an external supply to the VIN ) (J1
terminal and (JGND 3).
With the output of the power supply disabled, set its
voltage to the desired input test voltage (2.7V ≤ VIN ≤
5.5V). An ammeter may be placed between the input
supply and the VIN ( ) . J1 terminal Be sure to monitor
the supply voltage at the VIN ( ) J1 terminal, as the
ammeter and/or power lead resistance can reduce
the voltage supplied to the device.
2. Connect a load Vto the OUT terminals (J2, J5, J7)
and ground (J4, J6, J8) .terminals
The load can be either active passive (resistive) or
active (electronic load). An ammeter may be placed
between the load and the output terminals s. Make
sure the output voltage is monitored at VOUT1, VOUT2
and VOUT3 ( ) s. J2, J5 and J7 terminal The board has
multiple 2- s ) pin connector (JP1, JP2 and JP3 to
allow for output voltage monitoring of VOUT1
, VOUT2
and VOUT3 . respectively
3. Enable the Supply to MIC23450.
The MIC23450 evaluation up board has a pull-
resistor to VIN for each channel By default, . each
output voltage bled when the input supply of is ena
> V 2.7 is applied. Each channel 1, 2 or 3 can be
disabled by the Eapplying 0.4 a voltage below V to N
terminal or J14 respectivelyJ10, J12 .
4. Power Good.
The board provides a test point power ood g (J9,
J11, and J13 to monitor for ) the power good function
each channel The of the s 1, 2, and 3 respectively.
power good output high (goes VOUT) nominally 62 µs
after reaches the output voltage 90% of its nominal
voltage.
Ordering Information
Part Number Description
MIC23 YML450-AAA EV 3MHz, PWM,
2A Triple Buck
R egulator Evaluation Board
Micrel, Inc.
MIC23450 Evaluation Board
February 4, 2013 2 Revision 1.0
Evaluation Board
Other Features
S -S oft tart
The MIC23450 has an internal soft start for each
individual channel and requires no external soft start
capacitor. The typical soft start time for each channel is -
115µs.
Feedback Resistors , R14 -(R4 R7, R12 )
The feedback pin the control s , FB1, FB2 and are FB3
inputs for programming the output voltages VOUT1, VOUT2
and VOUT3 R s respectively. esistor divider network are
connected to from the output and these pin s are
compared to the internal 0.62V reference within the
regulation loop. The output voltage can be programmed
between 1V and 3.3V using resistor values calculated by
Equation 1:
Eq. 1
Example feedback resistor values are provided in Table
1.
Table 1
Output Voltage Programming Examples
VOUT1, VOUT2, VOUT3 R4, R6, R12 R5, R7, R14
1.2V 274k 294k
1.5V 316k 221k
1.8V 301k 158k
2.5V 324k 107k
3.3V 309k 71.5k
Power Good (PG1, PG2, PG3)
The evaluation board as test point s 1, 2, h s for channel
and 3 to monitor the PG 1, PG2 and PG3 signal These s.
are open to the corresponding output -drain connections
voltage of with on-board pull up resistor- s 100kΩ. The
PG signal will be µs asserted high approximately 62 after
the output voltage passes nominal set 90% of the
voltage.
Hyper Light Load Mode
The MIC23450 uses a minimum on and off time
proprietary control loop (patented by Micrel). When the
output voltage falls below the regulation threshold, the
error comparator begins a switching cycle that turns the
PMOS on and keeps it on for the duration of the
minimum- -on time. This increases the output voltage. If
the output voltage is over the regulation threshold, the
error comparator turns the PMOS off for a minimum-off-
time until the output drops below the threshold. The
NMOS acts as an ideal rectifier that conducts when the
PMOS is off. Using a NMOS switch instead of a diode n
allows for lower voltage drop across the switching device
when it is on. The asynchronous switching combination
between the PMOS and the NMOS allows the control
loop to work in discontinuous mode for light load
operations. In discontinuous mode, the MIC23450 works
in pulse frequency modulation (PFM) to regulate the
output. As the output current increases, the off-time
decreases, which provides more energy to the output.
This switching scheme improves the efficiency of
MIC23450 during light load currents by switching only
when it is needed. As the load current increases, the
MIC23450 goes into continuous conduction mode (CCM)
and switches at a frequency centered at . The 3MHz
equation to calculate the load when the MIC23450 goes
into continuous conduction mode is approximated by
Equation 2:
×
×−
>f2L
D)V(V
I
OUTIN
LOAD
2 Eq.
Micrel, Inc.
MIC23450 Evaluation Board
February 4, 2013 3 Revision 1.0
Equation 1 shows that the load at which MIC23 450
transitions from HyperLight Load mode to PWM mode is
a function of the input voltage (VIN), output voltage
(VOUT), duty cycle (D), inductance (L) and frequency (, f).
T “ . ” he Switching Frequency vs Load graph on page 3
shows that, as the urrent increases, the output c
switching frequency also increases until the MIC23450
goes from HyperLight Load mode to PWM mode at
approximately 450150mA. The MIC23 will switch at a
relatively constant frequency around 3MHz after the
output current is over 150 mA.
Multiple Sources
The MIC23450 provides all the pins necessary to
operate the regulators from independent sources. three
This can be useful in partitioning power within a multi rail
system. For example, it is possible that within a system,
two supplies are available; 3.3V and 5V. The MIC23450
can be connected to use the 3.3V supply to provide two,
low voltage outputs (e.g. 1.2V and 1.8V) and use the 5V
rail to provide a higher output (e.g. 2.5V), resulting in the
power blocks shown in Figure 1.
Figure 1. Multi- Source Power Block Diagram
To achieve this multiple source configuration on the
MIC23450YML EV, the PVIN of each channel and AVIN
must first be isolated from the global VIN by removing
the VIN resistor; R16 for Channel 1, R17 for Channel 2
and R18 for Channel 3. Once the global VIN is isolated,
a separate VIN source may then be supplied to the
isolated channel through the terminals provided (J15,
J16 and J17) which are labeled VIN1, VIN2 or VIN3
according to which channel they supply.

Especificaciones del producto

Marca: Microchip
Categoría: No categorizado
Modelo: MIC23450-AAAYML

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