参数资料
型号: L6730
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
封装: HTSSOP-20
文件页数: 6/52页
文件大小: 1569K
代理商: L6730
Device description
L6730 - L6730B
14/52
Doc ID 11938 Rev 3
5
Device description
5.1
Oscillator
The switching frequency is internally fixed to 400 kHz. The internal oscillator generates the
triangular waveform for the PWM charging and discharging an internal capacitor (FSW = 400
kHz). This current can be varied using an external resistor (RT) connected between OSC pin
and GND or VCCDR in order to change the switching frequency. Since the OSC pin is
maintained at fixed voltage (typ. 1.2 V), the frequency is increased (or decreased)
proportionally to the current sunk (sourced) from (into) the pin. In particular by connecting
RT versus GND the frequency is increased (current is sunk from the pin), according to the
following relationship:
Connecting RT to VCCDR reduces the frequency (current is sourced into the pin), according
to the following relationship:
Switching frequency variation vs. RT is shown in Figure 4.
Figure 4.
Switching frequency variation versus RT
)
(
10
88
.
9
400
6
Ω
+
=
K
R
KHz
Fsw
OSC
(1)
)
(
10
01
.
3
400
7
Ω
=
K
R
KHz
Fsw
OSC
(2)
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
s
w
(
KHz)
Rosc connected to GND
Rosc connected to Vccdr
相关PDF资料
PDF描述
L6730B 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6730TR 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6732CTR 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6732 SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6732TR SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
相关代理商/技术参数
参数描述
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