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L6759D 数据表(PDF) 37 Page - STMicroelectronics

部件名 L6759D
功能描述  Fully configurable through PMBus
PDF  51 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6759D 数据表(HTML) 37 Page - STMicroelectronics

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L6759D
Main oscillator
Doc ID 023240 Rev 1
37/51
10
Main oscillator
The internal oscillator generates the triangular waveform for the PWM charging and
discharging an internal capacitor with a constant current. 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.
By 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
F
SW
200kHz
1.02V
R
OSC kΩ
()
---------------------------
10
kHz
µA
-----------
⋅
+
=
F
SSW
230kHz
1.02V
R
SOSC kΩ
()
-------------------------------
11.5
kHz
µA
-----------
⋅
+
=
F
SW
200kHz
Vbias
1.02V
–
R
OSC kΩ
()
--------------------------------------
10
kHz
µA
-----------
⋅
–
=
F
SSW
230kHz
Vbias
1.02V
–
R
SOSC kΩ
()
--------------------------------------
11.5
kHz
µA
-----------
⋅
–
=



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