參數(shù)資料
型號： LC5511D
元件分類： 穩(wěn)壓器
英文描述： POWER FACTOR CONTROLLER, 18 kHz SWITCHING FREQ-MAX, DIP7
封裝： DIP-8/7
文件頁數(shù)： 19/40頁
文件大小： 888K
代理商： LC5511D
26
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28106.02
stopping voltage, VCC(OFF) = 9.4 V. Thus device operation in latch
mode is maintained. To release the device from latch mode, cut
off the AC mains and let VCC voltage drop below VCC(OFF).
Overvoltage Protection (OVP)
LC551xD series (non-isolated designs)
The LC551xD series
has three OVP activation methods link to the VCC pin, to the
OCP pin, and to the ISENSE pin:
VCC Pin Overvoltage Protection. figure 33 shows the wave-
forms of the OVP function on the VCC pin. When the VCC pin
voltage with reference to the S/GND pin reaches and exceeds
VCC(OVP) = 31.5 V, OVP is activated and the device enters
intermittent oscillation mode operation. The startup circuit tries
to sustain VCC pin voltage at VCC(BIAS)1 = 11.0 V, but in the
meanwhile, the COMP pin voltage gradually increases and when
it reaches 2.0 V, it stops the startup circuit, and then VCC declines
further. When it reaches VCC(OFF) = 9.4 V, the startup sequence
begins again, and if the overvoltage condition still exists, the
same process described above is repeated and overall operation
enters the intermittent oscillation mode.
In addition, because VCC voltage is proportional to the output
voltage, it can be used to detect an output overvoltage event, such
as open load condition. In this situation, the detecting voltage is
expressed by the formula below:
=
VOUT(OVP)
31.5 (V)
VCC(normal operation)
VOUT(normal operation)
(4)
Figure 33. Waveforms when VCC pin OVP is being activated (LC551xD)
ID
S/GND
GND(ID)
2.0 V
VCOMP
OVP detected
VCC(OVP) = 31.5 V
VCC(ON) = 15.1 V
VCC(BIAS)1 = 11.0 V
VCC(OFF) = 9.4 V
VCC
Startup
circuit on
Startup
circuit on
VCOMP ≥ 2.0 V, startup circuit off
Time
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相關(guān)代理商/技術(shù)參數(shù)
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LC5512B-10F484C 功能描述:CPLD - 復(fù)雜可編程邏輯器件 Use ispMACH 4000B RoHS:否 制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
LC5512B-10F484I 功能描述:CPLD - 復(fù)雜可編程邏輯器件 Use ispMACH 4000B RoHS:否 制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
LC5512B-10Q208C 功能描述:CPLD - 復(fù)雜可編程邏輯器件 Use ispMACH 4000B RoHS:否 制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
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