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L6751BTR Datasheet(PDF) 5 Page - STMicroelectronics

Part # L6751BTR
Description  Digitally controlled dual PWM for Intel VR12 and AMD SVI
Download  58 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6751BTR Datasheet(HTML) 5 Page - STMicroelectronics

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L6751B
List of figures
Doc ID 024028 Rev 1
5/58
List of figures
Figure 1.
Typical 6-phase application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3.
L6751B pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4.
JMode: voltage positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 5.
Device initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 6.
Voltage positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 7.
Current reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 8.
SLESS startup: enabled (left) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 9.
LSLESS startup: disabled (right) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 10.
DVID optimization circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 11.
Thermal monitor connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 12.
Output current vs. switching frequency in PSK mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 13.
Efficiency performance with and without enhancements (DPM, GDC). . . . . . . . . . . . . . . . 44
Figure 14.
ROSC vs. FSW per phase (ROSC to GND - left; ROSC to 3.3 V - right) . . . . . . . . . . . . . . . . 45
Figure 15.
Equivalent control loop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 16.
Control loop bode diagram and fine tuning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 17.
Device initialization: PMBus controlling Vout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 18.
L6751B VFQFPN68 8x8 mm drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56


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