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参数资料
| 型号： | L6740L |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, HTQFP-48 |
| 文件页数： | 30/44页 |
| 文件大小： | 755K |
| 代理商： | L6740L |
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Main oscillator
L6740L
8
Main oscillator
The controller embeds a dual-oscillator: one section is used for the CORE and it is a multi
phase programmable oscillator managing equal phase-shift among all phases and the other
section is used for the NB section. Phase-shift between the CORE and NB ramps is
automatically adjusted according to the CORE phase # programmed.
The internal oscillator generates the triangular waveform for the PWM charging and
discharging with a constant current an internal capacitor. The switching frequency for each
channel, FSW, is internally fixed at 150 kHz: the resulting switching frequency for the CORE
section at the load side results in being multiplied by N (number of configured phases).
The current delivered to the oscillator is typically 22
μA (corresponding to the free running
frequency FSW = 150 kHz) and it may be varied using an external resistor (ROSC) typically
connected between the OSC pin and SGND. Since the OSC pin is fixed at 1.240 V, the
frequency is varied proportionally to the current sunk from the pin considering the internal
gain of 6.8 kHz/
μA (See Figure 15).
Connecting ROSC to SGND the frequency is increased (current is sunk from the pin),
according to the following relationships:
Figure 15.
ROSC vs. switching frequency
F
SW
150kHz
1.240V
R
OSC kΩ
()
---------------------------- 6.8
kHz
μA
-----------
+
150kHz
8.432 10
6
R
OSC kΩ
()
-----------------------------
+
==
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相关代理商/技术参数 |
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|---|---|
| L6740LTR | 功能描述:DC/DC 开关控制器 Hybrid 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 |
| L6741 | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6741TR | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6743 | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6743_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:High current MOSFET driver |
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