MIC2186 Evaluation Board High Power Boost Advance Information

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MIC2186 Evaluation Board High Power Boost Advance Information

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MIC2186
MIC2186 Evaluation Board
High Power Boost Advance Information
General Description
This evaluation board provides platform evaluating MIC2186 high power boost controller boost topology. evaluation board schematic shown Figure Please refer MIC2186 data sheet detailed explanation MIC2186 boost converter operation.
3.3V 3.3V
VOUT
Maximum IOUT 4.5A 1.75A
Table Maximum Input/Output Voltage
Specifications
Recommended operating input voltage Output voltage, user selectable custom (see Table Maximum input output voltage Maximum output current. (see Table Output switching frequency duty cycle, user selectable. (see Table maximum output current demo board depends input output voltage. These limitation demo board circuit MIC2186 controller. Table lists maximum output current several common boost configurations.
Requirements
evaluation board requires input power source. source must able supply least 8.5A maximum power from output. output loaded with resistive active load. active load constant current constant resistance mode.
Precautions
evaluation board does have input reverse polarity protection. Applying negative voltage terminal (with respect ground) permanently damage components board. maximum input voltage limited volts MIC2186 maximum voltage rating. Exceeding this voltage damage exceed output. VINP MIC2186 connected output voltage. Exceeding damage part.
Schematic
+VIN14 En/UVLO 100k open 0.1µF 4.7µH 47µF
Freq/2 Chart SKIP
VINA
EN/ULVO FREQ SKIP SYNC
VINP
Si4884DY B530 shorted Si4884DY VOUT
SYNC
OUTN
VREF COMP SGND PGND HIDC
0.1µF 0.1µF
470pF 0.010 120µF 120µF 120µF 0.1µF
10nF
Chart
3.32k
1.62k
1.15k
open
Micrel, Inc. 1849 Fortune Drive Jose, 95131 (408) 944-0800 (408) 944-0970 http://www.micrel.com
August 2001
MIC2186
MIC2186
Jumper JP4-A JP4-B JP4-C JP4-D Description Sets VOUT Sets VOUT Sets VOUT
Getting Started
Connect input voltage source terminal terminal ammeter placed between source terminal monitor input current. Connect load output terminal, terminal ammeter used output well. output voltage with jumper JP4. Apply 3.3V input. main output voltage, measured between terminals should selected value. switching waveform (VSW) monitored with oscilloscope input side inductor (junction inductor PCB).
Sets VOUT custom voltage resistor location Table Output Voltage Jumper Selection
Input Undervoltage Lockout
Resistors input undervoltage lockout feature. When (EN/UVLO) pulled VIN, MIC2186 typically starts switching input voltage 2.9V. start voltage increased using R7/R8 voltage divider. formula calculate turn voltage
Jumper Settable Options
There jumpers board that used select various options output voltage. Three standard voltages selected placing shorting jumper across proper pins header JP4, illustrated output voltage jumper chart. Open resistor location allows user program output voltage from 14V. desired output voltage main output, resistor value calculated equation below.
1.245 VOUT 1.245
Where: desired input voltage when MIC2186 starts switching. the100K resistor evaluation board.
where: resistor evaluation board.
Jumper
Function PWM/SKIP Mode Select Frequency Select External Sync Select Output Voltage Select Duty Cycle Select
Description Sets SKIP mode. Selects High Frequency. Table settings. Remove external sync. Selects output voltage. Selects maximum duty cycle. Table settings. Table Jumper Chart
Setting High High
Setting
Switching Frequency 400kHz 200kHz 200kHz 100kHz
Maximum Duty Cycle
Table Frequency Duty Cycle Chart
MIC2186
August 2001
MIC2186
Bill Materials
Reference C10, J1-J9 JP1, JP2, 2551-2-00-01-00-00-07-0 MilMax WSL-2512-R010-F Dale equiv) B530 (SMC Package) CDRH127-4R7 Si4884DY Vishay- LiteOn Sumida Part Number MIC2186BM 594D127X0020R2T 594D476X0020D2T Manufacturer Micrel Vishay Vishay Description Boost controller 120uf, 20V, tantalum 47uf, tantalum 470pf, 50V,X7R ceramic 1uf, ceramic, 0.01uf, 50V,X7R ceramic 0.1uf, 50V,X7R ceramic schottky diode 4.7uH, inductor MOSFET (0805 size), 0.010 (2512 size), 1.62K (0805 size), open location (0805 size) 100K (0805 size), (0805 size), 3.32K (0805 size), 1.15K (0805 size), Turret Pins header header header shorting jumper
Micrel Semiconductor, tel: 408-944-0800, http://www.micrel.com Vishay Corp., tel: 206-452-5664, http://www.vishay.com Micro Commercial Corp., tel: (800) 346-3371 Diodes Inc, tel: (805) 446-4800, http://www.diodes.com Sumida, tel: (510) 668-0660, http://www.sumida.com muRata, tel: 800-831-9172
August 2001
MIC2186
MIC2186
Printed Circuit Board Layouts
Top-Side Silk Screen
Bottom-Side Silk Screen
Top-Side Copper
Bottom-Side Copper
MICREL INC.
1849 FORTUNE DRIVE JOSE, 95131
(408) 944-0800
(408) 944-0970
http://www.micrel.com
This information believed accurate reliable, however responsibility assumed Micrel infringement patents other rights third parties resulting from use. license granted implication otherwise under patent patent right Micrel Inc. 2001 Micrel Incorporated
MIC2186
August 2001

MIC2186 Evaluation Board High Power Boost Advance Information

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