MIC2182 Evaluation Board Synchronous Buck Evaluation Board G

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MIC2182 Evaluation Board Synchronous Buck Evaluation Board G

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MIC2182 Evaluation Board
MIC2182 Evaluation Board
Synchronous Buck Evaluation Board
General Description
This evaluation board provides platform evaluating MIC2182 synchronous buck controller evaluation board schematic shown Figure board comes with adjustable version MIC2182. Jumpers allow easy selection preset custom output voltages operating modes. board provides output current, while only occupying board space. Full-load efficiency better than 90%. MIC2182 switches nominal frequency 300kHz with capability synchronize higher frequencies. Please refer MIC2182 data sheet detailed explanation MIC2182 synchronous buck converter operation. Specifications Recommended Operating Input Voltage Maximum Input Voltage Output Voltage selectable* Maximum Output Current
1.8V, 2.5V, 3.3V, resistor programmable 1.3V
rating MIC2182 output capacitors. higher input voltages desired, input capacitors must replaced with components rated application. maximum input voltage MIC2182 28V. Jumper hard wired evaluation board. This prevents accidental removal jumper when adjustable version MIC2182 used. removed when using adjustable version, controller maximum duty cycle causing output voltage rise near input voltage. output tantalum capacitors will damaged catch fire their voltage rating exceeded.
Getting Started
Connect input voltage source terminal (J1) terminal (J6). ammeter placed between source terminal monitor input current. Connect load output terminal (J8) terminal (J7). ammeter used output well. Using banana jacks hard wiring connections board instead using terminal pins reduce contact resistance these connections. Select output voltage with jumper JP4. Make sure jumpers installed jumper desired mode operation. Table jumper configurations. Apply input. output voltage, measured terminals should selected value. switching waveform (VSW) monitored with oscilloscope input side inductor (junction inductor PCB). waveform difficult trigger, converter operating skip mode. Either install jumper (forcing mode) increase output current
Requirements
power source capable supplying recommended. output loaded with resistive active load. active load constant current constant resistance mode.
Precautions
This evaluation board does have input reverse polarity protection. Applying negative voltage terminal (with respect ground) permanently damage components board. maximum input voltage limited input capacitor's rating. Exceeding this voltage will damage capacitors. tantalum output capacitors rated 6.3V. exceed maximum rating output
Jumper
Open Automatic PWM/skip-mode selection External sync Disconnects external feedback MIC2182-3.3BM MIC2182-5.0BM fixed controllers
Closed Forced PWM-mode operation external sync Connects external feedback MIC2182BM controller Precautions."
Jumper JP4a JP4b JP4c JP4d
Output Voltage 1.8V 2.5V 3.3V custom voltage (configured
Table Operating Configuration Jumpers
Table Output Voltage Jumpers
Micrel, Inc. 1849 Fortune Drive Jose, 95131 (408) 944-0800 (408) 944-0970 http://www.micrel.com
February 2000
MIC2182 Evaluation Board
MIC2182 Evaluation Board
100k open 220µF MIC2182BM EN/UVLO
MIC2182 Evaluation Board
220µF SD103BWS 0.1µF
220µF
UVLO
0.1µF
4.7µF
Si4884 Si4884
Si4884 Si4884 B330
OPTION OPTION
3.3µH
OPTION OPTION
0.015 0.013
MODE: OPEN AUTO CLOSED
COMP SYNC
VOUT 470µF 6.3V 470µF 6.3V 0.1µF
February 2000
SYNC 0.1µF
PGND VOUT FB/VREF SGND
C13, 0.1µF
OPTION
22.6k 1.8V 2.5V 6.04k 3.3V
OPTION
2.2nF
SYNC: OPEN EXTERNAL CLOSED INTERNAL
0.1µF
DEVICE VERSION: FIXED VERSIONS OPEN FIXED, CLOSED ADJ. ONLY MUST CONNECTED ADJUSTABLE VERSION PRECAUTIONS PAGE
OUTPUT VOLTAGE SELECTION
Figure Evalutation Board Schematic
MIC2182 Evaluation Board
Output Voltage Selection 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 1.3V desired output voltage, resistor value calculated following equation:
typically starts switching input voltage 4.4V. startup voltage increased using R7-R8 voltage divider. formula calculate turn voltage
1.245 VOUT 1.245
where: Fixed Adjustable Versions evaluation board comes with adjustable version MIC2182. fixed output voltage versions MIC2182, jumper must removed 0.1µF ceramic capacitor must soldered location Input Undervoltage Lockout Resistors input undervoltage lockout feature. When (UVLO) pulled VIN, MIC2182
where: desired input voltage when MIC2182 starts switching 100k (supplied with evaluation board) Additional Features Resistor locations back board, used slow down dampen gate drive signal MOSFETs. etch shorting resistor pads must before resistor inserted. snubber used locations back board, dampen waveform. Capacitor location provided additional compensation voltage control loop required.
February 2000
MIC2182 Evaluation Board
MIC2182 Evaluation Board
Bill Materials
Item C12, C14, C10, C11, J1-J8 JP1, JP2, CRCW08051002FRT1 CRCW08051003FRT1 CRCW08056041FRT1 CRCW08052262FRT1 2551-2-00-01-00-00-07-0 Vishay/Dale Vishay/Dale Vishay/Dale Vishay/Dale Mill-Max TPSV477M006R0055 TAJA475M016R TPSV227M010R0060 CRCW08052001FRT1 WSL-2010-R015-F WSL-2010-R013-F Part Number MIC2182BM Si4884DY B330 SD103BWS CMDSH2-3 UP4B-3R3 Manufacturer Micrel Vishay/Siliconix Vishay/Lite-On Vishay/Lite-On Central Semiconductor Coiltronics Vishay/Dale Vishay/Dale Vishay/Dale Description high-eff. synchronous buck controller MOSFET 30V, Schottky 100mA 30V, Schottky 3.3µH 0.1µF 50V, ceramic open (0805 size) 2.2nF 50V, ceramic 50V, ceramic 470µF 6.3V, tantalum 4.7µF 16V, tantalum 220µF 10V, tantalum 0.015 (2010 size) 0.013 (2010 size) open 100k 6.04k 22.6k turret header header jumper Qty.
Vendor Vishay/Lite-On Vishay/Dale Vishay/Siliconix Central Semiconductor Coiltronics
Telephone Number (805) 446-4800 (402) 644-4218 (408) 988-8000 (516) 435-1110 (561) 241-7876 (803) 448-9411
Component Vendors
MIC2182 Evaluation Board
February 2000
MIC2182 Evaluation Board
Printed Circuit Layouts
Top-Side Silk Screen
Bottom-Side Silk Screen
Top-Side Copper
Bottom-Side Copper
February 2000
MIC2182 Evaluation Board
MIC2182 Evaluation Board
MIC2182 Evaluation Board
February 2000
MIC2182 Evaluation Board
February 2000
MIC2182 Evaluation Board
MIC2182 Evaluation Board
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. 2000 Micrel Incorporated
MIC2182 Evaluation Board
February 2000

MIC2182 Evaluation Board Synchronous Buck Evaluation Board G

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