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參數(shù)資料
| 型號： | TEA1751T/N1,518 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 9/29頁 |
| 文件大?。?/td> | 253K |
| 描述： | IC CTRLR GREENCHIP SMPS 16-SOIC |
| 標準包裝： | 2,500 |
| 系列： | GreenChip™ III |
| 模式： | 連續(xù)導電（CCM） |
| 頻率 - 開關： | 125kHz |
| 電流 - 啟動： | 60µA |
| 電源電壓： | 0.65 V ~ 22 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-SO |
| 包裝： | 帶卷 (TR) |
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TEA1751T_LT_2
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 23 December 2009
9 of 29
NXP Semiconductors
TEA1751T; TEA1751LT
GreenChip III SMPS control IC
7.2.3 Frequency limitation
To optimize the transformer and minimize switching losses, the switching frequency is
limited to f
sw(PFC)max
. If the frequency for quasi-resonant operation is above the f
sw(PFC)max
limit, the system switches over to discontinuous conduction mode. Also here, the PFC
MOSFET is only switched on at a minimum voltage across the switch (valley switching).
7.2.4 Mains voltage compensation (VINSENSE pin)
The mathematical equation for the transfer function of a power factor corrector contains
the square of the mains input voltage. In a typical application this results in a low
bandwidth for low mains input voltages, while at high mains input voltages the Mains
Harmonic Reduction (MHR) requirements may be hard to meet.
To compensate for the mains input voltage influence, the TEA1751(L)T contains a
correction circuit. Via the VINSENSE pin the average input voltage is measured and the
information is fed to an internal compensation circuit. With this compensation it is possible
to keep the regulation loop bandwidth constant over the full mains input range, yielding a
fast transient response on load steps, while still complying with class-D MHR
requirements.
In a typical application, the bandwidth of the regulation loop is set by a resistor and two
capacitors on the PFCCOMP pin.
7.2.5 Soft start-up (pin PFCSENSE)
To prevent audible transformer noise at start-up or during hiccup, the transformer peak
current, I
DM
, is increased slowly by the soft start function. This can be achieved by
inserting R
SS1
and C
SS1
between pin PFCSENSE and current sense resistor R
SENSE1
.
An internal current source charges the capacitor to V
PFCSENSE
= I
start(soft)PFC
?R
SS1
. The
voltage is limited to V
start(soft)PFC
.
The start level and the time constant of the increasing primary current level can be
adjusted externally by changing the values of R
SS1
and C
SS1
.
The charging current I
start(soft)PFC
flows as long as the voltage on pin PFCSENSE is
below 0.5 V (typ). If the voltage on pin PFCSENSE exceeds 0.5 V, the soft start current
source starts limiting current I
start(soft)PFC
. As soon as the PFC starts switching, the
I
start(soft)PFC
current source is switched off; see Figure 5
.
?SPAN class="pst TEA1751T-N1-518_2409373_9">softstart 3 R
SS1
C
SS1
?/DIV>
?/DIV>
=
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1752LT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChip III SMPS control IC |
| TEA1752LT/N1,518 | 功能描述:DC/DC 開關控制器 IC CTLR SMPS SW MODE RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TEA1752LT/N1/S1518 | 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| TEA1752T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:The TEA1752T and TEA1752LT combine a controller for Power Factor Correction (PFC) and a flyback controller. |
| TEA1752T/1791/DB/90W,598 | 制造商:NXP Semiconductors 功能描述:- Boxed Product (Development Kits) 制造商:NXP Semiconductors 功能描述:90W notebook adapter Ref |
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