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L6751B датащи(PDF) 45 Page - STMicroelectronics

номер детали L6751B
подробное описание детали  Digitally controlled dual PWM for Intel VR12 and AMD SVI
PDF  58 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6751B датащи(HTML) 45 Page - STMicroelectronics

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L6751B
Main oscillator
Doc ID 024028 Rev 1
45/58
10
Main oscillator
The internal oscillator generates the triangular waveform for the PWM charging and
discharging, with a constant current, an 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 16
Equation 17
Connecting ROSC/RSOSC to a positive voltage Vbias, the frequency is reduced (current is
injected into the pin), according to the following relationships:
Equation 18
Equation 19
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 Phasesection
SinglePhasesection
100
1000
75
100
125
150
175
200
225
Multi Phase section
SinglePhase section
AM14849v1



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