參數(shù)資料
型號： L6706
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, QCC40
封裝： 6 X 6 MM, ROHS COMPLIANT, VFQFPN-40
文件頁數(shù)： 32/47頁
文件大?。?/td> 623K
代理商： L6706
Oscillator
L6706
38/47
Doc ID 15698 Rev 2
16
Oscillator
The internal oscillator generates the triangular waveform for the PWM charging and
discharging with a constant current an internal capacitor. The current delivered to the
oscillator is typically 25
μA (corresponding to the free running frequency F
SW = 200 kHz)
and it may be varied using an external resistor (ROSC) connected between the OSC/FAULT
pin and SGND or VCC (or a fixed voltage greater than 1.24 V). Since the OSC/FAULT pin is
fixed at 1.240 V, the frequency is varied proportionally to the current sunk (forced) from (into)
the pin considering the internal gain of 10 kHz/
μA.
In particular connecting ROSC to SGND the frequency is increased (current is sunk from the
pin), while connecting ROSC to VCC = 12 V the frequency is reduced (current is forced into
the pin), according the following relationships:
ROSC vs. SGND
ROSC vs. +12V
Maximum programmable switching frequency must be limited to 1 MHz to avoid minimum
Ton limitation. Anyway, device power dissipation must be checked prior to design high
switching frequency systems.
Figure 22.
ROSC vs. switching frequency
F
SW
200 kHz
()
1.240V
R
OSC kΩ
()
---------------------------- 9.1
kHz
μA
-----------
+
200 kHz
() 11.284 10
3
R
OSC kΩ
()
--------------------------------
R
OSC kΩ
()
+
11.284 10
3
F
SW kHz
() 200 kHz
()
–
------------------------------------------------------------
==
=
k
Ω
[]
F
SW
200 kHz
() 12V 1.240V
–
R
OSC kΩ
()
------------------------------------ 9.1
kHz
μA
-----------
–
200 kHz
() 9.7916 10
4
R
OSC kΩ
()
--------------------------------
–
R
OSC kΩ
()
9.7916 10
4
200 kHz
() F
SW kHz
()
–
------------------------------------------------------------
==
=
k
Ω
[]
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