參數(shù)資料
型號： L6730B
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
封裝： HTSSOP-20
文件頁數(shù)： 6/52頁
文件大?。?/td> 1569K
代理商： L6730B
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
相關(guān)PDF資料
PDF描述
L6730TR 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6730BTR 功能描述:DC/DC 開關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6730C 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF)
L6730CQ 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification
L6730CQTR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification
L6730CTR 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF)
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