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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： | 28/51页 |
| 文件大小： | 646K |
| 代理商： | L6566A |
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Application information
L6566A
34/51
operating, so that the converter will work intermittently, which is very safe. In case of
overload the system has a power capability lower than that at nominal load but the output
current may be quite high and overstress the output rectifier. In case of FF operation the
capability is almost unchanged and both short circuit and overload conditions are more
critical to handle.
The L6566A, regardless of the operating option selected, makes it easier to handle such
conditions: the 2 V clamp on the SS pin is removed and a second internal current generator
ISS2 = ISS1 /4 keeps on charging Css. As the voltage reaches 5 V the device is disabled, if it
is allowed to reach 2 VBE over 5 V, the device will be latched off. In the former case the
resulting behavior will be identical to that under short circuit illustrated in Figure 6 on
; in the latter case the result will be identical to that of Figure 20 on page 33.
See Section 5.9: Latched disable function on page 32 for additional details.
A diode, with the anode to the SS pin and the cathode connected to the VREF pin (10) is the
simplest way to select either auto-restart mode or latch-mode behavior upon overcurrent. If
the overload disappears before the Css voltage reaches 5 V the ISS2 generator will be
turned off and the voltage gradually brought back down to 2 V. Refer to the Section 6:
section (Figure 7 on page 45) for additional
hints.
If latch-mode behavior is desired also for converter’s short circuit, make sure that the supply
voltage of the device does not fall below the UVLO threshold before activating the latch.
shows soft-start pin behavior under different operating conditions and with
different settings (latch-mode or autorestart).
Note:
Unlike other PWM controllers provided with a soft-start pin, in the L6566A grounding the SS
pin does not guarantee that the gate driver is disabled.
Figure 21.
Soft-start pin operation under different operating conditions and settings
t
Vcc
(pin 5)
SS
(pin 14)
t
COMP
(pin 9)
START-UP
TEMPORARY
OVERLOAD
t
GD
(pin 4)
NORMAL
OPERATION
NORMAL
OPERATION
RESTART
here the IC
shuts down
here the IC
latches off
Vcc falls below UVLO
before latching off
SHUTDOWN
LATCHED
AUTORESTART
UVLO
2V
5V
5V+2Vbe
t
Vcc_PFC
(pin 6)
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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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