參數(shù)資料
型號： L6714TR
廠商： 意法半導(dǎo)體
英文描述： 4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs
中文描述： 4英特爾VR10，VR11和AMD的6位嵌入式CPU的司機(jī)相控制器
文件頁數(shù)： 54/70頁
文件大小： 572K
代理商： L6714TR
Oscillator
L6714
54/70
19
Oscillator
L6714 embeds four phase oscillator with optimized phase-shift (90o phase-shift) in order to
reduce the input rms current and optimize the output filter definition.
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, F
SW
, is internally fixed at 150kHz so that the resulting switching frequency at the
load side results in being multiplied by N (number of phases).
The current delivered to the oscillator is typically 25
μ
A (corresponding to the free running
frequency F
SW
= 150kHz) and it may be varied using an external resistor (R
OSC
) connected
between the OSC pin and SGND or VCC (or a fixed voltage greater than 1.24V). Since the
OSC pin is fixed at 1.24V, the frequency is varied proportionally to the current sunk (forced)
from (into) the pin considering the internal gain of 6KHz/
μ
A.
In particular connecting R
OSC
to SGND the frequency is increased (current is sunk from the
pin), while connecting R
OSC
to VCC = 12V the frequency is reduced (current is forced into
the pin), according the following relationships:
R
OSC
vs. SGND
R
OSC
vs. +12V
When using the Low-Side MOSFETs current sense, the maximum programmable switching
frequency per phase must be limited to 500kHz to avoid current reading errors causing, as a
consequence, current sharing errors.
Anyway, device power dissipation must be checked prior to design high switching frequency
systems.
F
SW
150 kHz
)
R
OSC
k
)
---------------------------
6kHz
μ
A
+
150 kHz
)
R
OSC
k
3
)
-------------------------------
R
·
OSC
k
(
)
+
F
SW
-----------
=
=
=
A
--------
150 kHz
)
R
OSC
k
3
)
-------------------------------
R
·
OSC
k
(
)
+
3
150 kHz
F
SW
kHz
(
)
)
–
-----------------------------------------------------------
=
=
k
[
]
F
SW
150 kHz
)
R
OSC
k
(
)
-----------–
6kHz
μ
A
–
150 kHz
)
R
OSC
k
4
(
)
-------------------------------
–
R
OSC
k
(
)
15
-----
=
=
=
6kHz
μ
A
150 kHz
)
R
OSC
k
4
(
)
-------------------------------
–
R
OSC
k
(
)
4
F
SW
kHz
150 kHz
)
(
)
–
-----------------------------------------------------------
=
=
k
[
]
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