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L6751 Datasheet(PDF) 46 Page - STMicroelectronics

Part # L6751
Description  Digitally controlled dual PWM for Intel VR12 and AMD SVI
PDF  59 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6751 Datasheet(HTML) 46 Page - STMicroelectronics

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Main oscillator
L6751
46/59
Doc ID 023992 Rev 1
10
Main oscillator
The internal oscillator generates the triangular waveform for the PWM charging and
discharging, with a constant current, on the internal capacitor. The switching frequency for
each channel is internally fixed at 200 kHz (FSW) and at 230 kHz (FSSW): the resulting
switching frequency at the load side for the multi-phase section results in being multiplied by
N (number of configured phases).
The current delivered to the oscillator is typically 20
μA and may be varied using an external
resistor (ROSC, RSOSC) typically connected between the OSC/SOSC pins and GND. Since
the OSC/SOSC pins are fixed at 1.02 V, the frequency is varied proportionally to the current
sunk from the pin considering the internal gain of 10 KHz/
μA for the multi-phase section and
of 11.5 kHz/
μA for the single-phase section, see Figure 14.
Connecting ROSC/RSOSC to SGND, the frequency is increased (current is sunk from the pin),
according to the following relationships:
Equation 17
Equation 18
Connecting ROSC/RSOSC to a positive voltage Vbias, the frequency is reduced (current is
injected into the pin), according to the following relationships:
Equation 19
Equation 20
Figure 14.
ROSC vs. FSW per phase (ROSC to GND - left; ROSC to 3.3 V - right)
F
SW
200kHz
1.02V
R
OSC kΩ
()
---------------------------
10
kHz
μA
-----------
⋅
+
=
F
SSW
250kHz
1.02V
R
SOSC kΩ
()
-------------------------------
11.5
kHz
μA
-----------
⋅
+
=
F
SW
200kHz
Vbias
1.02V
–
R
OSC kΩ
()
--------------------------------------
10
kHz
μA
-----------
⋅
–
=
F
SSW
250kHz
Vbias
1.02V
–
R
SOSC kΩ
()
--------------------------------------
11.5
kHz
μA
-----------
⋅
–
=
10
100
1000
200
300
400
500
600
700
800
900
1000
Multi Phase section
SinglePhase section
100
1000
75
100
125
150
175
200
225
Multi Phase section
SinglePhase section
AM14820v1



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