參數(shù)資料
型號(hào)： L6566A
廠商： 意法半導(dǎo)體
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： Multi-mode controller for SMPS with PFC front-end
中文描述： 多模式開(kāi)關(guān)電源控制器，PFC前端
文件頁(yè)數(shù)： 33/51頁(yè)
文件大小： 410K
代理商： L6566A
L6566A
Application information
33/51
Figure 20. Operation after latched disable activation: timing diagram
DIS
(pin 8)
5.10
Soft-start and delayed latched shutdown upon overcurrent
At device start-up, a capacitor (Css) connected between the SS pin (14) and ground is
charged by an internal current generator, I
SS1
, from zero up to about 2V where it is clamped.
During this ramp, the overcurrent setpoint progressively rises from zero to the value
imposed by the voltage on the VFF pin (15, see “
PWM Comparator, PWM Latch and Voltage
Feedforward blocks
”); MOSFET’s conduction time increases gradually, hence controlling the
start-up inrush current. The time needed for the overcurrent setpoint to reach its steady
state value, referred to as soft-start time, is approximately:
Equation 9
During the ramp (i.e. until V
SS
= 2 V) all the functions that monitor the voltage on pin COMP
are disabled.
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 L6566A (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
Vcc
(pin 5)
Vcc
ON
GD
(pin 4)
Vin
Vcc
ON
-0.5
Vcc
OFF
t
t
t
t
4.5V
Vcc
restart
V
HVstart
HV generator is turned on
HV generator turn-on is disabled here
Input source is removed here
Vcc_PFC
(pin 6)
t
AC_OK
(pin 16)
Vth
Disable latch is reset here
Restart is quicker
t
=
=
3
V
1
I
Css
)
V
(
V
I
Css
T
VFF
1
SS
VFF
csx
1
SS
SS
相關(guān)PDF資料
PDF描述
L6566ATR Multi-mode controller for SMPS with PFC front-end
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6566A_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multi-mode controller for SMPS with PFC front-end
L6566ATR 功能描述:開(kāi)關(guān)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(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6566B 功能描述:開(kāi)關(guān)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(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)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(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
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