参数资料
| 型号： | TEA1753LT/N1,518 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 10/32页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SMPS SW MODE 16SO |
| 标准包装： | 2,500 |
| 系列： | GreenChip™ III |
| 输出隔离： | 隔离 |
| 频率范围： | 100kHz ~ 150kHz，250kHz |
| 输入电压： | 16 V ~ 38 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 600mW |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SO |
| 包装： | 带卷 (TR) |
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NXP Semiconductors
TEA1753LT
HV start-up flyback controller with integrated PFC controller
If a demagnetization signal is not detected on the PFCAUX pin, the controller generates a
Zero Current Signal (ZCS), 50 ? s after the last PFCGATE signal.
If a valley signal is not detected on the PFCAUX pin, the controller generates a valley
signal 4 ? s after demagnetization is detected.
To protect the internal circuitry during lightning events, for example, add a 5 k ? series
resistor to PFCAUX. To prevent incorrect switching due to external disturbance, place the
resistor close to the IC on the printed-circuit board.
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 DCM. 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 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 and a high bandwidth for high mains input voltages .
To compensate for the mains input voltage influence, TEA1753LT contains a correction
circuit. The average input voltage is measured using the VINSENSE pin and the
information is fed to an internal compensation circuit. Using this compensation, it is
possible to keep the regulation loop bandwidth constant over the mains input range. This
yields a fast transient response on load steps, while still complying with class-D MHR
requirements.
In a typical application, a resistor and two capacitors on the PFCCOMP pin set the
bandwidth of the regulation loop.
7.2.5 Soft start-up (PFCSENSE pin)
To prevent audible transformer noise at start-up or during hiccup, the soft-start function
slowly increases the transformer peak current. This increase is achieved by inserting R SS1
and C SS1 between the PFCSENSE pin 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 is adjusted
externally by changing the values of R SS1 and C SS1 .
? soft – s tart = 3 ? R SS1 ? C SS1
(1)
(2)
The charging current I start(soft)PFC flows as long as V PFCSENSE is below 0.5 V. If V PFCSENSE
exceeds 0.5 V, the soft-start current source starts limiting current I start(soft)PFC . When the
TEA1753LT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 24 August 2012
? NXP B.V. 2012. All rights reserved.
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相关代理商/技术参数 |
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| TEA1753T | 制造商:未知厂家 制造商全称:未知厂家 功能描述:The TEA1753T combines a controller for Power Factor Correction (PFC) and a flyback controller. |
| TEA1753T/N1 | 制造商:NXP Semiconductors 功能描述:SMPS CNTRL QR FLYBACK & QR PFCSO16 制造商:NXP Semiconductors 功能描述:SMPS CNTRL, QR FLYBACK & QR PFC,SO16 |
| TEA1753T/N1,518 | 功能描述:DC/DC 开关控制器 GreenChip III SMPS control IC RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TEA1753T/N1518 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
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