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| 型号： | L6599ATDTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SOP-16 |
| 文件页数： | 5/31页 |
| 文件大小： | 861K |
| 代理商： | L6599ATDTR |
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L6599AT
Application information
Doc ID 15534 Rev 3
13/31
Figure 4.
Typical system block diagram
6.1
Oscillator
The oscillator is programmed externally by means of a capacitor (CF) connected from pin 3
(CF) to ground, which is alternately charged and discharged by the current defined with the
network connected to pin 4 (RFmin). The pin provides an accurate 2 V reference with about
2 mA source capability and the higher the current sourced by the pin, the higher the
oscillator frequency. The block diagram in Figure 5 shows a simplified internal circuit that
explains the operation.
The network that loads the RFmin pin is generally made up of three branches:
1.
A resistor RFmin connected between the pin and ground, which determines the
minimum operating frequency.
2.
A resistor RFmax connected between the pin and the collector of the (emitter-grounded)
phototransistor that transfers the feedback signal from the secondary side back to the
primary side. While in operation, the phototransistor modulates the current through this
branch - thus modulating the oscillator frequency - to perform output voltage regulation.
The value of RFmax determines the maximum frequency at which the half-bridge is
operated when the phototransistor is fully saturated.
3.
An R-C series circuit (CSS+RSS) connected between the pin and ground that enables
the setup of a frequency shift at startup (see Section 6.3: Soft-start). Note that the
contribution of this branch is zero during steady-state operation.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6599ATN | 制造商:STMicroelectronics 功能描述: |
| L6599D | 功能描述:软开关 PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6599DTR | 功能描述:软开关 PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6599N | 功能描述:软开关 PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6599NR | 功能描述:电压模式 PWM 控制器 HV resonant CNTRL RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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