參數(shù)資料
型號(hào)： L6717
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC48
封裝： 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFPN-48
文件頁(yè)數(shù)： 41/56頁(yè)
文件大?。?/td> 1081K
代理商： L6717
Main oscillator
L6717
46/56
Doc ID 17326 Rev 1
9
Main oscillator
The controller embeds a dual-oscillator: one section is used for the CORE and it is a multi-
phase 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, FSW, is internally fixed at 200 kHz: 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 20
μA (corresponding to the free running
frequency FSW=200 kHz) and it may be varied using an external resistor (ROSC) typically
connected between the OSC pin and SGND. Since the OSC pin is fixed at 1.240 V, the
frequency is varied proportionally to the current sunk from the pin considering the internal
gain of 9.1 kHz/
μA (See Figure 15).
Connecting ROSC to SGND the frequency is increased (current is sunk by the pin),
according to the following relationships:
Connecting ROSC to a positive voltage (recommended 3.3 V rail) the frequency is reduced
(current is injected into the pin), according to the following relationships:
where +V is the positive voltage which the ROSC resistor is connected.
Figure 15.
ROSC vs. switching frequency
F
SW
200kHz
1.240V
R
OSC
------------------- 9.1
kHz
μA
-----------
+
=
F
SW
200kHz
+V
1.240
–
R
OSC
---------------------------- 9.1
kHz
μA
-----------
–
=
FSW vs. Rosc
75
125
175
225
275
325
375
425
0
50
100
150
200
250
300
350
400
450
Rosc [kOhm]
Fs
w
[
k
H
z]
Rosc+ (to SGND)
Rosc- (to 3V3)
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