LM5039 Literature Number: JAJA419
POWER designer Expert tips, tricks, and techniques for powerful designs No. 128 national.com/powerdesigner ACL By Ajay Hari, Senior Applications Engineer and Robert Oppen, Design Manager 1/4 1/8 500W FET 1/2 FET 1 (ACL) Figure 1 C1 C2 VIN VIN LM5039 UVLO HO Q1 C1 VOUT ACL LO Q2 C2 RAMP RT SR2 SS SR1 COMP AGND PGND Error AMP and Isolation Figure 1.
IT / / IC IC Backplane Backplane Repeater 48V A 48V B CML CML Stackable Multi-phase System Controller ORing FET Deserializer Serializer 48V Stackable Multi-phase Hot Swap Control and Monitoring LVDS LVDS CLK 12V, 5V, 3.3V FPGA I 2 C/SMBus System Monitor Intermediate Bus Converter DDR Memory MAC MAC MAC Ethernet PHY Ethernet PHY PCIe Repeater Hot Swap and Monitoring Peripheral Card Ethernet Port Ethernet Port I/O Port LM27402 LM3753 LM3754 PowerWise POL IC LM25066 PCB / IC LM96080 ADC128D818 LMV7231 DS50PCI402 LM5035C LM5039 LM25066 national.com / comms
POWER designer ACL Q1 Q2 Q1 Q2 2 LC (PWM) PWM PWM Figure 2 Figure 2 SW 2 - V OUT SW SW Figure 2. - national.com/powerdesigner 3
POWER designer ACL ACL COMP 5V 5V RAMP + - PWM Comparator Peak Cycle-by-Cyle Limit + - Average Current Limit LM5039 Terminate PWM 600 mv + - 500 mv CS ACL ACL ACL ACL Frequency Foldback Hiccup- Mode Logic +5V RES ACL C ACL 12 µa I OUT = ( N PRI N SEC ) x 500 mv R CS x CT TURNS Figure 3. LM5039 LM5039 2 CS (ACL)Figure 3 ACL 0.5V 0.6V CS 0.5V CS0.5V ACL ACL COMP PWM ACL 0.6V ACL ACL COMP NPRI NSEC 1 2 RCS CTTURNS V OUT (V) 3.5 3 2.5 2 1.5 1 0.5 0 25 30 35 40 I OUT (A) 36V 48V 75V Figure 4. V OUT vs I OUT 4
POWER designer LM5039 RT 1/3ACL AC Figure 4 VOUT vs. IOUT VOUT SW SW ACL Figure 5. Figure 5 Figure 6 ACL ACL SW VOUT ACL ACL SW Figure 6 Figure 6. LM5039 PWM 2 AC PWM national.com / comms national.com/powerdesigner 5
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