参数资料
型号: L6730DTR
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: 5/50页
文件大小: 1486K
代理商: L6730DTR
L6730C - L6730D
Device description
13/50
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 (FSW =
400KHz). 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. 1.2V), the frequency is increased (decreased) proportionally to
the current sunk (sourced) from (into) the pin. In particular, connecting RT versus GND the
frequency is increased (current is sunk from the pin), according to the following relationship:
Connecting RT to VCCDR the frequency is reduced (current is sourced into the pin), according to
the following relationship:
Switching frequency variation vs. RT is shown in Figure 3..
Figure 3.
Switching frequency variation versus RT.
)
(
10
88
.
9
400
6
+
=
K
R
KHz
Fsw
OSC
(1)
)
(
10
01
.
3
400
7
=
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)
Fs
w
(
K
H
z)
Rosc connected to GND
Rosc connected to Vccdr
相关PDF资料
PDF描述
L6730D 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6730CQTR 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, QCC24
L6730CTR 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6730 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6730B 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
相关代理商/技术参数
参数描述
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L6731D 功能描述:DC/DC 开关控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK
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