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L6751C 데이터시트(PDF) 44 Page - STMicroelectronics

부품명 L6751C
상세설명  Digitally controlled dual PWM for Intel VR12 and AMD SVI
PDF  57 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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L6751C 데이터시트(HTML) 44 Page - STMicroelectronics

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Main oscillator
L6751C
44/57
DocID025037 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
A 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/
A for the multi-phase section and
of 11.5 kHz/
A 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)
FSW
200kHz
1.02V
ROSC k

---------------------------- 10
kHz
A
-----------
+
=
FSSW
250kHz
1.02V
RSOSC k

-------------------------------- 11.5
kHz
A
-----------
+
=
FSW
200kHz
Vbias 1.02V
–
ROSC k

-------------------------------------- 10
kHz
A
-----------
–
=
FSSW
250kHz
Vbias 1.02V
–
RSOSC k

-------------------------------------- 11.5
kHz
A
-----------
–
=
10
100
1000
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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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