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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： | 33/51页 |
| 文件大小： | 646K |
| 代理商： | L6566A |
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L6566A
Application information
39/51
While the brownout protection is active the start-up generator keeps on working but, being
there no PWM activity, the Vcc voltage continuously oscillates between the start-up and the
HV generator restart thresholds, as shown in the timing diagram of Figure 25 on page 38.
The brownout comparator is provided with current hysteresis in addition to voltage
hysteresis: an internal 15 A current sink is ON as long as the voltage applied on the
AC_OK pin is such that the AC_FAIL signal is high. This approach provides an additional
degree of freedom: it is possible to set the ON threshold and the OFF threshold separately
by properly choosing the resistors of the external divider (see below). With just voltage
hysteresis, instead, fixing one threshold automatically fixes the other one depending on the
built-in hysteresis of the comparator.
With reference to Figure 25 on page 38, the following relationships can be established for
the ON (VsenON) and OFF (VsenOFF) thresholds of the sensed voltage:
Equation 13
which, solved for RH and RL, yield:
Equation 14
It is typically convenient not to use additional dividers connected to high-voltage rails
because this could make it difficult to meet no-load consumption targets envisaged by
energy-saving regulations. Figure 26 shows a simple voltage sensing technique that makes
use of the divider already used by the PFC control chip to sense the ac mains voltage with
just the addition of an extra tap.
The small-signal NPN Q and the capacitor CF make a peak detector, so that the information
of the rms mains voltage can be found across CF. Tap’s position determines the dc voltage
to be sensed by the AC_OK pin. It is convenient to use a level as high as possible to
minimize the effect of VBE changes with temperature. However, it could be necessary to limit
the maximum sensed voltage below 7 V to prevent Q’s emitter reverse breakdown; it would
not be destructive because the reverse current would be quite small (the resistors seen by
Figure 26.
AC voltage sensing with the L6566A
L
H
OFF
L
6
H
ON
R
45
.
0
R
45
.
0
Vsen
R
485
.
0
10
15
R
485
.
0
Vsen
=
+
=
45
.
0
Vsen
45
.
0
R
;
10
15
Vsen
078
.
1
Vsen
R
OFF
H
L
6
OFF
ON
H
=
=
L6566A
Rectified
input voltage
RH
Sensed
voltage:
Vsen < 7V
RL
CF
3
MULT
L6561
L6562/A
L6563
Vcc
5
AC_OK
16
Q
For minimum
temperature drift
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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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