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L6751 Datasheet(PDF) 3 Page - STMicroelectronics

Part # L6751
Description  Digitally controlled dual PWM for Intel VR12 and AMD SVI
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6751 Datasheet(HTML) 3 Page - STMicroelectronics

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L6751
Contents
Doc ID 023992 Rev 1
3/59
7.2.2
Overcurrent and power states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.2.3
Single-phase section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8
Single NTC thermal monitor and compensation . . . . . . . . . . . . . . . . . 41
8.1
Thermal monitor and VR_HOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.2
Thermal compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.3
TM/STM and TCOMP/STCOMP design . . . . . . . . . . . . . . . . . . . . . . . . . . 42
9
Efficiency optimization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.1
Dynamic phase management (DPM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.2
Variable frequency diode emulation (VFDE) . . . . . . . . . . . . . . . . . . . . . . 44
9.2.1
VFDE and DrMOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.3
Gate drive control (GDC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
10
Main oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
11
System control loop compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
11.1
Compensation network guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
11.2
LTB Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
12
PMBus support (preliminary) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
12.1
Enabling the device through PMBus . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
12.2
Controlling Vout through PMBus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
12.3
Input voltage monitoring (READ_VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
12.4
Duty cycle monitoring (READ_DUTY) . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
12.5
Output voltage monitoring (READ_VOUT) . . . . . . . . . . . . . . . . . . . . . . . . 55
12.6
Output current monitoring (READ_IOUT) . . . . . . . . . . . . . . . . . . . . . . . . 55
12.7
Temperature monitoring (READ_TEMPERATURE) . . . . . . . . . . . . . . . . . 55
12.8
Overvoltage threshold setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
13
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
14
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58


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