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参数资料
| 型号： | L6566A |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.8 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, SOP-16 |
| 文件页数： | 25/51页 |
| 文件大小： | 646K |
| 代理商： | L6566A |
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L6566A
Application information
31/51
Figure 18.
Hiccup-mode OCP: timing diagram
5.8
PFC interface
The device is specifically designed to minimize converter’s losses under light or no-load
conditions, and a special function has been provided to help the designer meet energy
saving requirements even in power-factor-corrected systems where a PFC pre-regulator
precedes the isolated DC-DC converter.
Actually EMC regulations require compliance with low-frequency harmonic emission limits
at nominal load; no limit is envisaged when the converter operates with a light load. Then
the PFC pre-regulator can be turned off, thus saving the no-load consumption of this stage
(0.5
÷1 W).
To do so, the L6566A provides the Vcc_PFC pin (6): this pin is internally connected to the
Vcc pin (5) via a PNP transistor, normally closed, that opens when the voltage VCOMP falls
below VCOMPO, a threshold internally set at a value depending on whether QR operation or
FF operation is selected. This pin is intended for supplying the PFC controller of the pre-
regulator as shown in Figure 16 on page 28. The switch is thermally protected, so that the
IC will stop if an external failure causes the pin to be overloaded for too long time or shorted
to ground.
Vcc
(pin 5)
GD
(pin 4)
OCP latch
VccON
VccOFF
Vccrestart
Secondary diode is shorted here
t
VCS
(pin 7)
Vcc_OK
t
1.5 V
Vcc_PFC
(pin 6)
t
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6566A_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Multi-mode controller for SMPS with PFC front-end |
| L6566ATR | 功能描述:开关变换器、稳压器与控制器 Multi Mode PWM Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6566B | 功能描述:开关变换器、稳压器与控制器 Multi Mode PWM Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6566B_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Multi-mode controller for SMPS |
| L6566BH | 功能描述:电流型 PWM 控制器 Multimode Controller SMPS 800V <3mA RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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