Datasheet LT8550 (Analog Devices) - 26
| Hersteller | Analog Devices |
| Beschreibung | 4-Phase DC/DC Expander with Internal Gate Drivers for Buck Converters |
| Seiten / Seite | 34 / 26 — APPLICATIONS INFORMATION. LT8550. Figure 18. Recommended PC Board Design … |
| Dateiformat / Größe | PDF / 3.2 Mb |
| Dokumentensprache | Englisch |
APPLICATIONS INFORMATION. LT8550. Figure 18. Recommended PC Board Design for a 9-Phase System
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LT8550
APPLICATIONS INFORMATION
prevent additional RMS losses in upstream cabling, 6. The VIN current is the DC supply current which flows fuses or battery. The LT8550’s multi-phase architec- into the device from the VIN pin directly, and it is spec- ture can help reduce the ESR losses. ified in the Electrical Characteristic table. VIN current 5. Body diode conduction loss. During the dead time, typically results in a small (<0.1%) loss. the loss in the bottom MOSFET is IL • VF, where VF Other hidden losses, such as copper trace, fuse and bat- is around 0.7V. At higher switching frequencies, the tery resistance, etc. can account for additional efficiency dead time becomes a higher percentage of the switch- degradation. It’s important to take them into consideration ing cycle period and causes the efficiency to drop. during the system design phase. VIN RSENSE RSENSE1 RSENSE5 LP MN MN L1 MN L5 MN MN MN C C C C H H1 H5 OUT CIN CIN1 COUT1 CIN5 COUT5 GND C GND GND IN2 COUT2 CIN6 COUT6 CH2 CH6 R MN SENSE2 MN RSENSE6 MN MN L2 L6 PRIMARY CONTROLLER MASTER FIRST SLAVE
LT8550 LT8550
RSENSE3 RSENSE7 MN L3 MN L7 MN MN CH3 CH7 CIN3 COUT3 CIN7 COUT7 C GND GND IN4 COUT4 CIN8 COUT8 CH4 CH8 MN RSENSE4 MN RSENSE8 MN MN L4 L8 VOUT MORE SLAVE LT8550s CONNECTED VIA 8550 F18
Figure 18. Recommended PC Board Design for a 9-Phase System
Rev. 0 26 For more information www.analog.com
APPLICATIONS INFORMATION
prevent additional RMS losses in upstream cabling, 6. The VIN current is the DC supply current which flows fuses or battery. The LT8550’s multi-phase architec- into the device from the VIN pin directly, and it is spec- ture can help reduce the ESR losses. ified in the Electrical Characteristic table. VIN current 5. Body diode conduction loss. During the dead time, typically results in a small (<0.1%) loss. the loss in the bottom MOSFET is IL • VF, where VF Other hidden losses, such as copper trace, fuse and bat- is around 0.7V. At higher switching frequencies, the tery resistance, etc. can account for additional efficiency dead time becomes a higher percentage of the switch- degradation. It’s important to take them into consideration ing cycle period and causes the efficiency to drop. during the system design phase. VIN RSENSE RSENSE1 RSENSE5 LP MN MN L1 MN L5 MN MN MN C C C C H H1 H5 OUT CIN CIN1 COUT1 CIN5 COUT5 GND C GND GND IN2 COUT2 CIN6 COUT6 CH2 CH6 R MN SENSE2 MN RSENSE6 MN MN L2 L6 PRIMARY CONTROLLER MASTER FIRST SLAVE
LT8550 LT8550
RSENSE3 RSENSE7 MN L3 MN L7 MN MN CH3 CH7 CIN3 COUT3 CIN7 COUT7 C GND GND IN4 COUT4 CIN8 COUT8 CH4 CH8 MN RSENSE4 MN RSENSE8 MN MN L4 L8 VOUT MORE SLAVE LT8550s CONNECTED VIA 8550 F18
Figure 18. Recommended PC Board Design for a 9-Phase System
Rev. 0 26 For more information www.analog.com