參數(shù)資料
型號： L6599AN
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, DIP16
封裝： ROHS COMPLIANT, DIP-16
文件頁數(shù)： 19/36頁
文件大?。?/td> 1595K
代理商： L6599AN
Application information
L6599A
26/36
Doc ID 15308 Rev 5
The circuit shown in Figure 28b can be operated in two different ways. If the resistor RA in
series to CA is small (not above some hundred Ω, just to limit current spiking) the circuit
operates like a capacitive current divider; CA will be typically selected equal to Cr/100 or
less and will be a low-loss type, the sense resistor RB will be selected as:
Equation 7
and CB will be such that RBCB is in the range of 10 /fmin.
If the resistor RA in series to CA is not small (in this case it will be typically selected in the ten
k
Ω), the circuit operates like a divider of the ripple voltage across the resonant capacitor Cr,
which, in turn, is related to its current through the reactance of Cr. Again, CA will be typically
selected equal to Cr/100 or less, this time not necessarily a low-loss type, while RB
(provided it is << RA) according to:
Equation 8
where the reactance of CA (XCA) and Cr (XCr) should be calculated at the frequency where
ICrpk = ICrpkx. Again, CB will be such that RBCB is in the range of 10 /fmin.
Whichever circuit one is going to use, the calculated values of Rs or RB should be
considered just a first cut value that needs to be adjusted after experimental verification.
OCP is effective in limiting primary-to-secondary energy flow in case of an overload or an
output short circuit, but the output current through the secondary winding and rectifiers
under these conditions might be so high to endanger converter’s safety if continuously
flowing. To prevent any damage during these conditions it is customary to force converter’s
intermittent operation, in order to bring the average output current to values such that the
thermal stress for the transformer and the rectifiers can be easily handled.
With the L6599A the designer can program externally the maximum time TSH that the
converter is allowed to run overloaded or under short circuit conditions. Overloads or short
circuits lasting less than TSH will not cause any other action, hence providing the system
with immunity to short duration phenomena. If, instead, TSH is exceeded an overload
protection (OLP) procedure is activated that shuts down the L6599A and, in case of
continuous overload/short circuit, results in continuous intermittent operation with a user-
defined duty cycle.
+
π
=
A
r
Crpkx
B
C
1
I
8
.
0
R
Cr
2
C
2
A
Crpkx
B
X
R
I
8
.
0
R
A
+
π
=
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6599ATD 功能描述:電壓模式 PWM 控制器 Sgl Output 13.3 V 200 KHz SOIC-16 Nrw RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(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
L6599ATDTR 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 IMPROVED High-Volt RESONANT 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
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
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