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| 型號： | TEA1750T/N1,518 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 9/29頁 |
| 文件大?。?/td> | 163K |
| 描述： | IC PFC CONTROLLER DCM16SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | GreenChip™ III |
| 模式： | 間歇導(dǎo)電（DCM） |
| 頻率 - 開關(guān)： | 100kHz ~ 150kHz |
| 電流 - 啟動： | 60µA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SO |
| 包裝： | 帶卷 (TR) |
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TEA1750_2
?NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 15 December 2008
9 of 29
NXP Semiconductors
TEA1750
GreenChip III SMPS control IC
For applications with high transformer ringing frequencies (after the secondary stroke),
the PFCAUX pin should be connected via a capacitor and a resistor to the auxiliary
winding. A diode must than be placed from the ground connection to the PFCAUX pin.
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 inuence, the TEA1750 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
ows 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.
?/DIV>
SoftStart
3 R
SS1
?/DIV>
C
SS1
?/DIV>
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1750T-T | 功能描述:DC/DC 開關(guān)控制器 GREENCHIPIII RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
| TEA1751AT/N1,518 | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
| TEA1751AT/N1518 | 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| TEA1751LT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChip III SMPS control IC |
| TEA1751LT/N1 | 制造商:NXP Semiconductors 功能描述:AC-DC PFC FLYBACK CNTRL 16SOIC 制造商:NXP Semiconductors 功能描述:AC-DC, PFC, FLYBACK, CNTRL, 16SOIC 制造商:NXP Semiconductors 功能描述:GreenChip III SMPS Control 16-Pin SO |
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