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L6751 データシート(PDF) 5 Page - STMicroelectronics

部品番号 L6751
部品情報  Digitally controlled dual PWM for Intel VR12 and AMD SVI
PDF  59 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6751 データシート(HTML) 5 Page - STMicroelectronics

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L6751
List of figures
Doc ID 023992 Rev 1
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List of figures
Figure 1.
Typical 6-phase application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3.
L6751 pin connections (left: top view - right: bottom view) . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4.
JMode: voltage positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 5.
Device initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 6.
Voltage positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 7.
Current reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 8.
LSLESS startup: enabled (left) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 9.
LSLESS startup: disabled (right) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 10.
DVID optimization circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 11.
Thermal monitor connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 12.
Output current vs. switching frequency in PSK mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 13.
Efficiency performance with and without enhancements (DPM, GDC). . . . . . . . . . . . . . . . 45
Figure 14.
ROSC vs. FSW per phase (ROSC to GND - left; ROSC to 3.3 V - right) . . . . . . . . . . . . . . . . 46
Figure 15.
Equivalent control loop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 16.
Control loop bode diagram and fine tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 17.
Device initialization: PMBus controlling Vout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 18.
L6751 WPLGA72 6x6 mm package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57



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