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)： 14/31頁(yè)
文件大?。?/td> 861K
代理商： L6599ATDTR
L6599AT
Application information
Doc ID 15534 Rev 3
21/31
The circuit shown in Figure 11b can be operated in two different ways. If the resistor RA in
series to CA is small (not above a few hundred ohms, just to limit current spiking) the circuit
operates like a capacitive current divider; CA is typically selected equal to Cr/100 or less and
is a low-loss type, and the sense resistor RB is selected as:
Equation 7
and CB is such that RBCB is in the range of 10 /fmin.
If the resistor RA in series with CA is not small (in this case it is typically selected in the ten
k
Ω range), 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 is
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 is such that RBCB is in the range of 10 /fmin.
Whichever circuit is used, the calculated values of Rs or RB should be considered
preliminary values that may need 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 that they endanger the converter’s safety if
continuously flowing. To prevent any damage during these conditions it is customary to force
the intermittent operation of the converter, 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 L6599AT the designer can externally program 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 do 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 L6599AT and, in cases 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
=
相關(guān)PDF資料
PDF描述
L6599D 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6599N 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP16
L6599TR 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6610D 6-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
L6610N 6-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP24
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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