參數(shù)資料
型號(hào)： L6599ATDTR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
封裝： SOP-16
文件頁(yè)數(shù)： 15/31頁(yè)
文件大?。?/td> 861K
代理商： L6599ATDTR
Application information
L6599AT
22/31
Doc ID 15534 Rev 3
Figure 12.
Soft-start and delayed shutdown upon overcurrent timing diagram
This function is achieved with pin 2 (DELAY), by means of a capacitor CDelay and a parallel
resistor RDelay connected to ground. As the voltage on the ISEN pin exceeds 0.8 V the first
OCP comparator, in addition to discharging CSS, turns on an internal current generator that
sources 150 A from the DELAY pin and charges CDelay. During an overload/short-circuit
the OCP comparator and the internal current source are repeatedly activated and CDelay is
charged with an average current that depends essentially on the time constant of the current
sense filtering circuit, on CSS and the characteristics of the resonant circuit. The discharge
due to RDelay can be neglected, considering that the associated time constant is typically
much longer.
This operation continues until the voltage on CDelay reaches 2 V, which defines the TSH time.
There is not a simple relationship that links TSH to CDelay, thus it is more practical to
determine CDelay experimentally. As a rough indication, with CDelay = 1 F, TSH is in the
order of 100 ms.
Once CDelay is charged at 2 V the internal switch that discharges CSS is forced low
continuously regardless of the OCP comparator’s output, and the 150 A current source is
continuously on, until the voltage on CDelay reaches 3.5 V. This phase lasts:
Equation 9
with TMP expressed in ms and CDelay in F. During this time, the L6599AT runs at a
frequency close to fstart (see Section 6.3: Soft-start) to minimize the energy inside the
resonant circuit. As the voltage on CDelay is 3.5 V, the L6599AT stops switching and the
PFC_STOP pin is pulled low. Also, the internal generator is turned off, so that CDelay is now
slowly discharged by RDelay. The IC restarts when the voltage on CDelay is less than 0.3 V,
which takes:
Equation 10
Delay
MP
C
10
T
=
Delay
3
.
0
5
.
3
Delay
STOP
C
R
5
.
2
ln
C
R
T
≈
=
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6599ATN 制造商:STMicroelectronics 功能描述:
L6599D 功能描述:軟開關(guān) PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
L6599DTR 功能描述:軟開關(guān) PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
L6599N 功能描述:軟開關(guān) PWM 控制器 Hi Vltg resonant Controller RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
L6599NR 功能描述:電壓模式 PWM 控制器 HV resonant CNTRL RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
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