LTC3728EUH
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LTC3728EUH - LTC3728EUH
QUICK START GUIDE DEMONSTRATION CIRCUIT
2-PHASE DUAL OUTPUT POWER SUPPLY
LTC3728EUH DESCRIPTION
Demonstration circuit step-down converter featuring LTC3728EUH regulator. PolyPhasedual output controller LTC3728EUH drives high current synchronous buck converters. Input 5V-14V, output 2.5V with loads output 1.8V with loads 13A.
Table Performance Summary
PARAMETER Minimum Input Voltage Maximum Input Voltage VOUT1 VOUT2 Nominal Switching Frequency 14V, IOUT1 14V, IOUT1 CONDITION VALUE 2.5V 1.8V 450kHz
applications with input voltage less than DC447 includes circuit footprint bottom side provide bias power supply. Design files this circuit board available. Call factory.
QUICK START PROCEDURE
Demonstration circuit easy evaluate performance LTC3728EUH. Refer Figure proper measurement equipment setup follow procedure below:
NOTE: When measuring input output voltage rip3. With power off, connect input 5V-14V (rec-
ommended 12V) power supply GND. VOUT1 should within 2.5V ±0.1V VOUT2 should 1.8V ±0.1V.
Increase load VOUT1 13A. With input,
ple, care must taken avoid long ground lead oscilloscope probe. Measure input output voltage ripple touching probe directly across input output ground terminals. Figure proper scope probe technique.
Before powering place jumpers shown
input current should less than 3.5A. Slowly decrease input voltage input voltage, input current should less than
Decrease load VOUT1 Increase input
voltage 12V.
Increase load VOUT2 13A. With input,
Figure
Connect loads VOUT1 VOUT2. load
current
input current should less than 2.5A. Slowly decrease input voltage input, input current should less than
QUICK START GUIDE DEMONSTRATION CIRCUIT
2-PHASE DUAL OUTPUT POWER SUPPLY
LOAD
LOAD
Figure Proper Measurement Equipment Setup
Figure Scope Probe Placement Measuring Input Output Ripple
VO1SEN
VO1SEN 43.2K INPUT SEL.
>5VIN
5VBIAS 0603 0.003 2512 180UF 7343 VOUT1 VOUT1 0603
5VBIAS
100K SYNC 11.8K 0.1UF 33PF
180PF
<5VIN
SUMIDA CDEP105-1R3MC-50 Si7860DP Si7856DP 1.3UH
1000PF
RUN/SS1 SENSE1+ SENSE1VOSENSE1 FREQSET PLLIN ITH1 SGND 3.3VOUT ITH2 VOSENSE2 SENSE2-
BOOST1 EXTVCC INTVCC PGND BOOST2
SYNC
0603 4.7UF 0805 0.1UF CMDSH-3
B320A
2.5V@13A
VOUT1
1000PF
0805 4.7UF 4.7UF 1210 1210 B320A 1.3UH +C11 4.7UF 4.7UF 56UF,25V OSCON 1210 1210
5V-14V
RUN/SS1 P.S. C.C.M INTVCC VO2SEN
1000PF 0.01UF 0.01UF 33PF 20.5K 0.1UF 26.1K 180PF
100K
0.1UF
CMDSH-3
Si7860DP Si7856DP
1000PF
0.003 2512
VOUT2 VOUT2 0603 220UF 2.5V VOUT2
SENSE2+ RUN/SS2 LTC3728EUH
1.8V@13A
RUN/SS2
INTVCC
OPTIONAL DISTRIBUTED
1210 1210 1210 1210 1210 1210 1210 1210 1210 1210 >5VIN <5VIN
OPTIONAL BIAS CIRCUIT
4.7UH TOKO, FSLM2520-4R7 10UF 1206 LT1613 SOT23-5 CMDSH-3 10UF 1206 5VBIAS 37.4K 12.1K 5VBIAS
+C32 7343
VOUT1
BIAS INPUT
NOTES: UNLESS OTHERWISE SPECIFIED
RESISTORS OHMS, 0603. R23=R24=R25=0 WILL ASSEMBLED ONLY OUTPUTS TIED TOGETHER HIGH CURRENT OUTPUT. INSTALL SHUN JP1-JP5 VIN<5V, INST SHUNTS
+C43 7343
1210
1210
1210
1210
1210
1210
1210
1210
1210
1210 7343
VOUT2
CONTRACT
+C54 7343 1210 1210 1210 1210 1210 1210 1210 1210 1210 1210 7343 APPROVALS
DRAWN: CHECKED: APPROVED: ENGINEER: DESIGNER:
1630 McCarthy Blvd. Milpitas, 95035 Phone: (408)432-1900 TECHNOLOGY Fax: (408)434-0507 Confi dential-For Customer Only TITLE:
2-PHASE DUAL OUTPUT SUPPLY
SIZE
DATE:
DC447A-1 LTC37 28EUH
SHEET
Friday, August 2002
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