參數(shù)資料
型號(hào)： L6563H
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： POWER FACTOR CONTROLLER, PDSO16
封裝： ROHS COMPLIANT, SOP-16
文件頁(yè)數(shù)： 30/48頁(yè)
文件大?。?/td> 1634K
代理商： L6563H
Application information
L6563H
36/48
Doc ID 16047 Rev 2
Figure 52.
Timing diagram: normal power-up and power-down sequences
As the Vcc voltage reaches the start-up threshold (12 V typ.) the low-voltage chip starts
operating and the HV generator is cut off by the Vcc_OK signal asserted high. The device is
powered by the energy stored in the Vcc capacitor until the self-supply circuit (we assume
that it is made with an auxiliary winding in the transformer of the cascaded dc-dc converter
and a steering diode) develops a voltage high enough to sustain the operation. The residual
consumption of this circuit is just the one on the 15 M
Ω resistor (10 mW at 400 Vdc),
typically 50-70 times lower, under the same conditions, as compared to a standard start-up
circuit made with external dropping resistors.
At converter power-down the dc-dc converter loses regulation as soon as the input voltage
is so low that either peak current or maximum duty cycle limitation is tripped. Vcc then drops
and stops IC activity as it falls below the UVLO threshold (9.5 V typ.). The Vcc_OK signal is
de-asserted as the Vcc voltage goes below a threshold VCCrestart located at about 6 V.
The HV generator can now restart. However, if Vin < VHVstart, HV_EN is de-asserted too
and the HV generator is disabled. This prevents converter's restart attempts and ensures
monotonic output voltage decay at power-down in systems where brownout protection (see
the relevant section) is not used.
If the device detects a fault due to feedback failure the pin PWM_LATCH is asserted high
(see “Feedback failure protection” section for more details) and, in order to maintain alive
this signal to be provided to the DC-DC converter, the internal VCCrestart is brought up to
over the VccOff (Turn-off threshold). As a result, shown in Figure 53, the voltage at pin Vcc,
oscillates between its turn-on and turn-off thresholds until the HV bus is recycled and drops
below the start up threshold of the HV generator.
The High Voltage Start-up circuitry is capable to guarantee a safe behavior in case of short
circuit present on the dc-dc output when the Vcc of both controllers are generated by the
same auxiliary winding. The Figure 54 shows how the PFC manages the Vcc cycling and
the associated power transfer. At short circuit the auxiliary circuit is no longer able to sustain
the Vcc which start dropping; reaching its VccOFF threshold the IC stops switching, reduces
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6563HTR 功能描述:功率因數(shù)校正 IC 700V 6mA Start-Up Transition-Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
L6563S 功能描述:功率因數(shù)校正 IC Transition Mode PFC 5mA 90uA 1.5% Ref RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
L6563STR 功能描述:功率因數(shù)校正 IC Transition Mode PFC 5mA 90uA 1.5% Ref RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
L6563TR 功能描述:功率因數(shù)校正 IC POWER SUPPLY RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
L6564 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:10 pin transition-mode PFC controller
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