- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄67754 > L6566BTR (STMICROELECTRONICS) 0.8 A POWER FACTOR CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO16 PDF資料下載
參數(shù)資料
| 型號： | L6566BTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.8 A POWER FACTOR CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, SOP-16 |
| 文件頁數(shù)： | 28/51頁 |
| 文件大?。?/td> | 624K |
| 代理商： | L6566BTR |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁當前第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁
Application information
L6566B
34/51
The soft-start pin is also invoked whenever the control voltage (COMP) saturates high,
which reveals an open-loop condition for the feedback system. This condition very often
occurs at start-up, but may be also caused by either a control loop failure or a converter
overload/short circuit. A control loop failure results in an output overvoltage that is handled
by the OVP function of the L6566B (see next section). In case of QR operation, a short
circuit causes the converter to run at a very low frequency, then with very low power
capability. This makes the self-supply system that powers the device unable to keep it
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 L6566B, 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 7 on
; in the latter case the result will be identical to that of Figure 20 on page 33. See
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 “Application
examples and Ideas” section (Table 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 L6566B 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
相關PDF資料 |
PDF描述 |
|---|---|
| L6706 | SWITCHING REGULATOR, QCC40 |
| L6717 | DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC48 |
| L6728HTR | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10 |
| L6728H | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10 |
| L6728 | 1.5 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, DSO10 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6566BTR-CUT TAPE | 制造商:ST 功能描述:L6566B Series 23 V 4.6 mA SMPS Multi-Mode Controller Surface Mount - SOIC-16N |
| L6567 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH VOLTAGE DRIVER FOR CFL |
| L6567D | 制造商:STMicroelectronics 功能描述:CFL DRVR 18V 14SOP - Rail/Tube |
| L6569 | 功能描述:功率驅動器IC Hi-Volt Half Bridge RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6569 | 制造商:STMicroelectronics 功能描述:IC HALF BRIDGE+OSC 6569 DIP8 |
發(fā)布緊急采購，3分鐘左右您將得到回復。