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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： | 18/51页 |
| 文件大小： | 646K |
| 代理商： | L6566A |
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L6566A
Application information
25/51
Figure 12.
Addition of an offset to the current sense lowers the burst-mode
operation threshold
5.4
Adaptive UVLO
A major problem when optimizing a converter for minimum no-load consumption is that the
voltage generated by the auxiliary winding under these conditions falls considerably as
compared even to a few mA load. This very often causes the supply voltage Vcc of the
control IC to drop and go below the UVLO threshold so that the operation becomes
intermittent, which is undesired. Furthermore, this must be traded off against the need of
generating a voltage not exceeding the maximum allowed by the control IC at full load.
To help the designer overcome this problem, the device, besides reducing its own
consumption during burst-mode operation, also features a proprietary adaptive UVLO
function. It consists of shifting the UVLO threshold downwards at light load, namely when
the voltage at pin COMP falls below a threshold VCOMPO internally fixed (see "PFC
Interface"), so as to have more headroom. To prevent any malfunction during transients from
minimum to maximum load the normal (higher) UVLO threshold is re-established when the
Vcc has exceeded the normal UVLO threshold (see Figure 13). The normal UVLO threshold
ensures that at full load the MOSFET will be driven with a proper gate-to-source voltage.
Rs
L6566A
R
Vref
Rc
10
4
7
3
Vcso = Vref
R
R + Rc
Figure 13.
Adaptive UVLO block
VCOMPL
VCOMPO
VCOMP
(pin 9)
Vcc
(pin 5)
Q
VccOFF1
VccOFF2
t
Vcc_PFC
(pin 6)
Tdelay
(*) VccOFF2 < VccOFF1 is selected when Q is high
+
-
UVLO
VccOFF1
Vcc
L6566A
COMP
R
S
Q
+
-
+
-
VccOFF2
(*)
SW
5
9
VCOMPL
VCOMPO
Vcc_PFC
logic
Vcc_PFC
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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