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參數資料
| 型號： | TEA1791T/N1,118 |
| 廠商： | NXP Semiconductors |
| 文件頁數： | 3/12頁 |
| 文件大?。?/td> | 236K |
| 描述： | IC CTRLR GREENCHIP SYNC 8-SOIC |
| 標準包裝： | 2,500 |
| 系列： | GreenChip™ |
| 模式： | 間歇導電（DCM） |
| 電源電壓： | 8.5 V ~ 38 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
TEA1791T
All information provided in this document is subject to legal disclaimers.
?NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 7 June 2010
3 of 12
NXP Semiconductors
TEA1791T
GreenChip synchronous rectifier controller
7. Functional description
7.1 Introduction
The TEA1791T is the controller for synchronous rectification to be used in discontinuous
conduction mode and quasi-resonant flyback converters.
7.2 Start-up and UnderVoltage LockOut (UVLO)
The IC leaves the undervoltage lockout state and activates the synchronous rectifier
circuitry as soon as the voltage on the V
CC
pin is above 8.5 V (typical). When the voltage
drops below 8.0 V (typical), the undervoltage lockout state is reentered and the SR driver
output is actively kept low.
7.3 Synchronous rectification
After a negative voltage (310 mV typical) is sensed on the SRSENSE pin, the driver
output voltage is driven HIGH and the external MOSFET is switched on. As soon as the
SRSENSE voltage rises to 55 mV the driver output voltage is regulated to maintain the
55 mV on the SRSENSE pin. When the SRSENSE voltage is above 12 mV, the driver
output is pulled to ground.
After switch-on of the SR MOSFET, the input signal on the SRSENSE pin is blanked for
2 約 (typical). This eliminates false switch-off due to high frequency ringing at the start of
the secondary stroke.
Because the driver output voltage is reduced when the voltage on the SRSENSE pin is
55 mV, the external power switch can be switched off quickly when the current through
the switch reaches zero. The zero current switch-off removes the need for a separate
Standby mode to maintain high efficiency during the no-load operation. The zero current is
detected by sensing a 12 mV level on the SRSENSE pin (see Figure 3
).
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TEA1792AT/1,118 | 制造商:NXP Semiconductors 功能描述:Synchronous Rectifier Controller 8-Pin SO T/R 制造商:NXP Semiconductors 功能描述:TEA1792AT/SO8/REEL13//1 - Tape and Reel 制造商:NXP Semiconductors 功能描述:IC SYNC RECT CONTROLLER 8SOIC |
| TEA1792ATS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChip synchronous rectifier controller |
| TEA1792ATS/1,115 | 制造商:NXP Semiconductors 功能描述:Synchronous Rectifier Controller 6-Pin TSOP T/R 制造商:NXP Semiconductors 功能描述:TEA1792ATS/SC-74/REEL7//1 - Tape and Reel 制造商:NXP Semiconductors 功能描述:IC SYNC RECT CONTROLLER 6TSOP |
| TEA1792N1 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChip synchronous rectifier controller |
| TEA1792T/N1,118 | 功能描述:DC/DC 開關控制器 20V 0.45W 10% 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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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