參數資料
型號： L6566ATR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 0.8 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, SOP-16
文件頁數： 19/51頁
文件大?。?/td> 646K
代理商： L6566ATR
Application information
L6566A
26/51
5.5
PWM control block
The device is specific for secondary feedback. Typically, there is a TL431 on the secondary
side and an optocoupler that transfers output voltage information to the PWM control on the
primary side, crossing the isolation barrier. The PWM control input (pin 9, COMP) is driven
directly by the phototransistor's collector (the emitter is grounded to GND) to modulate the
duty cycle (Figure 14, left-hand side circuit).
In applications where a tight output regulation is not required, it is possible to use a primary-
sensing feedback technique. In this approach the voltage generated by the self-supply
winding is sensed and regulated. This solution, shown in Figure 14, right-hand side circuit,
is cheaper because no optocoupler or secondary reference is needed, but output voltage
regulation, especially as a result of load changes, is quite poor. Ideally, the voltage
generated by the self-supply winding and the output voltage should be related by the
Naux/Ns turn ratio only. Actually, numerous non-idealities, mainly transformer's parasites,
cause the actual ratio to deviate from the ideal one. Line regulation is quite good, in the
range of ± 2 %, whereas load regulation is about ±5 % and output voltage tolerance is in the
range of ±10 %.
The dynamics of the pin is in the 2.5 to 5 V range. The voltage at the pin is clamped
downwards at about 2 V. If the clamp is externally overridden and the voltage on the pin is
pulled below 1.4 V the L6566A will shut down. This condition is latched as long as the
device is supplied. While the device is disabled, however, no energy is coming from the self-
supply circuit, thus the voltage on the Vcc capacitor will decay and cross the UVLO
threshold after some time, which clears the latch and lets the HV generator restart. This
function is intended for an externally controlled burst-mode operation at light load with a
reduced output voltage, a technique typically used in multi-output SMPS, such as those for
CRT TVs or monitors (see the timing diagram Figure 15 on page 27).
Figure 14.
Possible feedback configurations that can be used with the L6566A
Vout
TL431
L6566A
9
COMP
L6566A
5
Vcc
Naux
9
COMP
Cs
Secondary feedback
Primary feedback
相關PDF資料
PDF描述
L6605D SPECIALTY CONSUMER CIRCUIT, PDSO20
L6605 SPECIALTY CONSUMER CIRCUIT, PDIP18
L6660 SPECIALTY CONSUMER CIRCUIT, PDSO24
L6920DBTR 0.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
L6920DB 0.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
相關代理商/技術參數
參數描述
L6566B 功能描述:開關變換器、穩(wěn)壓器與控制器 Multi Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6566B_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multi-mode controller for SMPS
L6566BH 功能描述:電流型 PWM 控制器 Multimode Controller SMPS 800V <3mA RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6566BHTR 功能描述:電流型 PWM 控制器 MULTIMODE CONTROLLER SMPS 8V 3 mA RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6566BTR 功能描述:電流型 PWM 控制器 MultiMode Controller for SMPS RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數量 廠商 批號 封裝
添加更多采購

我的聯系方式

*
*
*