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參數(shù)資料
| 型號： | L6740LTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Hybrid controller (4+1) for AMD SVID and PVID processors |
| 中文描述： | 混合控制器（4 1對AMD SVID和PVID）處理器 |
| 文件頁數(shù)： | 36/44頁 |
| 文件大?。?/td> | 657K |
| 代理商： | L6740LTR |
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Main oscillator
L6740L
36/44
8
Main oscillator
The controller embeds a dual-Oscillator: one section is used for the CORE and it is a
multiphase programmable oscillator managing equal phase-shift among all phases and the
other section is used for the NB section. Phase-Shift between the CORE and NB ramps is
automatically adjusted according to the CORE phase # programmed.
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: the resulting switching frequency for the CORE
section at the load side results in being multiplied by N (number of configured phases).
The current delivered to the oscillator is typically 22
μ
A (corresponding to the free running
frequency F
SW
=150kHz) and it may be varied using an external resistor (R
OSC
) typically
connected between the OSC pin and SGND. Since the OSC pin is fixed at 1.240V, the
frequency is varied proportionally to the current sunk from the pin considering the internal
gain of 6.8KHz/
μ
A (See
Figure 15
).
Connecting R
OSC
to SGND the frequency is increased (current is sunk from the pin),
according to the following relationships:
Figure 15.
R
OSC
vs. switching frequency
F
SW
150kHz
R
OSC
k
(
)
---------------------------
6.8kHz
A
+
150kHz
6
R
OSC
k
(
)
----------------------------
+
=
=
100
200
300
400
500
600
700
800
900
1000
10
100
1000
Rosc Resistor [kOhms]
S
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