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参数资料
| 型号： | TEA1742T |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A POWER FACTOR CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 3.90 MM, PLASTIC, MS-012, SOT96-1, SOP-8 |
| 文件页数： | 17/17页 |
| 文件大小： | 99K |
| 代理商： | TEA1742T |
TEA1742T_1
NXP B.V. 2009. All rights reserved.
Objective data sheet
Rev. 01 — 10 February 2009
9 of 17
NXP Semiconductors
TEA1742T
GreenChip PFC controller
7.2.7 Overcurrent protection (PFCSENSE pin)
The maximum peak current is limited cycle-by-cycle by sensing the voltage across an
external sense resistor, RSENSE1, on the source of the external MOSFET. The voltage is
measured via the PFCSENSE pin.
7.2.8 Mains undervoltage lockout / brownout protection (VINSENSE pin)
To prevent the PFC from operating at very low mains input voltages, the voltage on the
VINSENSE pin is sensed continuously. As soon as the voltage on this pin drops below the
Vstop(VINSENSE) level, switching of the PFC is stopped.
The voltage on pin VINSENSE is clamped to a minimum value,
Vstart(VINSENSE) + Vpu(VINSENSE), for a fast restart as soon as the mains input voltage is
restored after a mains dropout.
7.2.9 Overvoltage protection (VOSENSE pin)
To prevent output overvoltage during load steps and mains transients, an overvoltage
protection circuit is built in.
As soon as the voltage on the VOSENSE pin exceeds the Vovp(VOSENSE) level, switching of
the power factor correction circuit is inhibited. Switching of the PFC recommences as
soon as the VOSENSE pin voltage drops below the VOVP(VOSENSE) level again.
When the resistor between pin VOSENSE and ground is open, the overvoltage protection
is also triggered.
7.2.10 PFC open-loop protection (VOSENSE pin)
The power factor correction circuit does not start switching until the voltage on the
VOSENSE pin is above the Vth(ol)(VOSENSE) level. This protects the circuit from open-loop
and VOSENSE short situations.
7.2.11 Driver (pin PFCDRIVER)
The driver circuit to the gate of the power MOSFET has a current sourcing capability of
typically
500 (TBF) mA and a current sink capability of typically 1.2 (TBF) A. This permits
fast turn-on and turn-off of the power MOSFET for efcient operation.
8.
Limiting values
Table 3.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
Min
Max
Unit
Voltages
VCC
supply voltage
0.4
+38
V
VPFCCOMP
voltage on pin PFCCOMP
0.4
+5
V
VVINSENSE voltage on pin VINSENSE
0.4
+5
V
VVOSENSE
voltage on pin VOSENSE
0.4
+5
V
VPFCAUX
voltage on pin PFCAUX
25
+25
V
VPFCSENSE voltage on pin PFCSENSE
current limited
0.4
+5
V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TEA1742T/N1,118 | 功能描述:DC/DC 开关控制器 GreenChip PFC controller 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 |
| TEA1750 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:The TEA1750 combines a controller for Power Factor Correction (PFC) and a flyback controller. |
| TEA1750T | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:GreenChip III SMPS control IC |
| TEA1750T,518 | 制造商:NXP Semiconductors 功能描述:SYNC RECTIFIER (SR) CONTROLLER |
| TEA1750T/N1,518 | 功能描述:DC/DC 开关控制器 GREENCHIPIII 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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