參數(shù)資料
型號(hào): L6730BTR
廠商: 意法半導(dǎo)體
英文描述: Adjustable step-down controller with synchronous rectification
中文描述: 可調(diào)式降壓同步整流控制器
文件頁(yè)數(shù): 13/52頁(yè)
文件大?。?/td> 1370K
代理商: L6730BTR
L6730 - L6730B
Device description
13/52
5
Device description
5.1
Oscillator
The switching frequency is internally fixed to 400kHz. The internal oscillator generates the
triangular waveform for the PWM charging and discharging an internal capacitor (F
SW
=
400kHz). This current can be varied using an external resistor (R
T
) connected between OSC
pin and GND or V
CCDR
in order to change the switching frequency. Since the OSC pin is
maintained at fixed voltage (typ. 1.2V), the frequency is increased (or decreased) proportionally
to the current sunk (sourced) from (into) the pin. In particular by connecting R
T
versus GND the
frequency is increased (current is sunk from the pin), according to the following relationship:
Connecting R
T
to V
CCDR
reduces the frequency (current is sourced into the pin), according to
the following relationship:
Switching frequency variation vs. R
T
is shown in
Figure 3.
.
Figure 3.
Switching frequency variation versus RT.
)
(
10
K
88
.
R
400
6
+
=
KHz
Fsw
OSC
(1)
)
(
10
K
01
.
R
400
7
=
KHz
Fsw
OSC
(2)
Switching Frequency Variation
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
0
100
200
300
400
500
600
700
800
900 1000
Rosc (KOHM)
F
Rosc connected to GND
Rosc connected to Vccdr
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