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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： | 32/51页 |
| 文件大小： | 646K |
| 代理商： | L6566A |
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Application information
L6566A
38/51
5.12
Brownout protection
Brownout protection is basically a not-latched device shutdown function activated when a
condition of mains undervoltage is detected. There are several reasons why it may be
desirable to shut down a converter during a brownout condition, which occurs when the
mains voltage falls below the minimum specification of normal operation.
Firstly, a brownout condition may cause overheating of the PFC front-end due to an excess
of RMS current. Secondly, brownout can also cause the PFC pre-regulator to work open
loop. This could be dangerous to the PFC itself and the downstream converter, should the
input voltage return abruptly to its rated value, given the slow response of PFC to transient
events. Finally, spurious restarts may occur during converter power down, hence causing
the output voltage not to decay to zero monotonically.
L6566A shutdown upon brownout is accomplished by means of an internal comparator, as
shown in the block diagram of Figure 25, which shows the basic circuit usage. The inverting
input of the comparator, available on the AC_OK pin (16), is supposed to sense a voltage
proportional to either the RMS or the peak mains voltage; the non-inverting input is
internally referenced to 0.485 V with 35 mV hysteresis. If the voltage applied on the AC_OK
pin before the device starts operating does not exceed 0.485 V or if it falls below 0.45 V
while the device is running, The AC_OK signal goes high, the pin Vcc_PFC is open and the
device shuts down, with the soft-start capacitor discharged and the gate-drive output low.
Additionally, in case the device has been latched off by some protection function (in which
case Vcc is oscillating between VccON and VccON - 0.5 V) the AC_OK voltage falling below
0.45 V will clear the latch. This feature can be used to allow a quicker restart as the input
source is removed.
Figure 25.
Brownout protection: internal block diagram and timing diagram
-
+
L6566A
AC_FAIL
AC_OK
Vcc
16
5
0.485V
0.45V
15 A
RH
RL
Sensed
voltage
Vcc
(pin 5)
GD
(pin 4)
Vout
VAC_OK
(pin 16)
0.45V
IHYS
15 A
t
Vcc_PFC
(pin 6)
AC_FAIL
Sensed voltage
VsenON
VsenOFF
0.485V
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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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