参数资料
| 型号： | TEA1752LT/N1,518 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 10/34页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SMPS SW MODE 16SOIC |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 输入电压： | 14 V ~ 38 V |
| 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： | 标准包装 |
| 其它名称： | 568-5962-6 |
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NXP Semiconductors
TEA1752T; TEA1752LT
GreenChip III SMPS control IC
It is advisable to add a 5 k Ω series resistor to this pin to provide surge protection for the
internal circuitry against events such as lightning surge. To prevent incorrect switching
due to external disturbance, this resistor should be placed as close as possible 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 discontinuous conduction mode. The PFC MOSFET is
then 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.
The TEA1752(L)T incorporates a correction circuit to compensate for the mains input
voltage influence. The average input voltage is measured via the VINSENSE pin and this
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 regulation loop bandwidth 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 is increased slowly by the soft start function. This can be achieved by inserting
R SS1 and C SS1 between pin PFCSENSE and the 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 time constant of the increasing primary current level can be adjusted
externally by changing the values of R SS1 and C SS1 .
τ softstart = 3 × R SS1 × C SS1
The charging current I start(soft)PFC flows if the voltage on pin PFCSENSE is lower than
0.5 V (typical). If the voltage on pin PFCSENSE exceeds 0.5 V, the soft start current
source limits current I start(soft)PFC . When the PFC starts switching, the I start(soft)PFC current
source is switched off (see Figure 5 ).
Resistor R SS1 and capacitor C SS1 are also used to prevent audible noise, when the PFC is
switched off by performing a soft stop.
TEA1752T_LT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 24 June 2010
? NXP B.V. 2010. All rights reserved.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TEA1752T | 制造商:未知厂家 制造商全称:未知厂家 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 |
| TEA1752T/N1,518 | 功能描述:DC/DC 开关控制器 IC CTLR SMPS SW MODE 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 |
| TEA1753 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS) controller ICs. |
| TEA1753LT/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 |
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