參數(shù)資料
型號(hào)： L6566B
廠商： 意法半導(dǎo)體
英文描述： Multi-mode controller for SMPS
中文描述： 多模式開(kāi)關(guān)電源控制器
文件頁(yè)數(shù)： 34/51頁(yè)
文件大?。?/td> 401K
代理商： L6566B
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 2V clamp on the SS pin is removed and a second internal current generator
I
SS2
= I
SS1
/4 keeps on charging Css. As the voltage reaches 5V the device is disabled, if it
is allowed to reach 2 V
BE
over 5V, 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
page 20
; in the latter case the result will be identical to that of
Figure 20 on page 33
. See
Section 5.9: Latched disable function on page 32
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 5V the I
SS2
generator will be turned
off and the voltage gradually brought back down to 2V. Refer to the “Application examples
and Ideas” section (
Table 8 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.
Figure 21
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
(pin 5)
t
Vcc
SS
(pin 14)
t
t
COMP
(pin 9)
START-UP
TEMPORARY
OVERLOAD
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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6566B_08 制造商:STMICROELECTRONICS 制造商全稱(chēng):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(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)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(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)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(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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
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