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| 型号： | TEA1761T/N2 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.4 A SWITCHING CONTROLLER, PDSO8 |
| 封装： | 3.90 MM, PLASTIC, MS-012, SOT-96-1, SOP-8 |
| 文件页数： | 7/13页 |
| 文件大小： | 78K |
| 代理商： | TEA1761T/N2 |
TEA1761T_2
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 25 April 2007
3 of 13
NXP Semiconductors
TEA1761T
GreenChip synchronous rectier controller
6.
Pinning information
6.1 Pinning
6.2 Pin description
7.
Functional description
The TEA1761T is the controller for synchronous rectication to be used in discontinuous
conduction mode and quasi resonant yback converters. Besides controlling the
SR MOSFET, the TEA1761T contains the voltage reference and ampliers to regulate and
control the output voltage and current of the power supply.
7.1 Start-up and undervoltage lock out
The IC leaves the under-voltage lock-out state and activates the synchronous rectier
circuitry and also the voltage/current sense circuitry as soon as the voltage on the VCC pin
is above 8.6 V (typical). As soon as the voltage drops below 8.1 V (typical), the
under-voltage lock-out state is re-entered and the SR driver output is actively kept low and
also the opto driver output is disabled.
7.2 Synchronous rectication
After a negative voltage (
310 mV typical) is sensed on the SRSENSE pin, the driver
output voltage is made 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. As soon as the SRSENSE voltage is above 12 mV, the
Fig 2.
Pin conguration for TEA1761T
TEA1761T
SRSENSE
VCC
GND
ISENSE
n.c.
VSENSE
DRIVER
OPTO
001aae772
1
2
3
4
6
5
8
7
Table 2.
Pin description
Symbol
Pin
Description
SRSENSE
1
synchronous timing input
GND
2
ground
n.c.
3
not connected
DRIVER
4
driver output for SR MOSFET
OPTO
5
opto coupler driver output
VSENSE
6
sense input for voltage control
ISENSE
7
sense input for current control
VCC
8
supply voltage
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TEA1762T | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:GreenChip synchronous rectifier controller |
| TEA1762T/N2,118 | 功能描述:DC/DC 开关控制器 SYN Rectifier Controller 14-Pin 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 |
| TEA1762T/N2/DG,118 | 功能描述:DC/DC 开关控制器 3.5V 5mA 10% 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 |
| TEA1771 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:GreenChip PC primary control IC |
| TEA1771T/N2,518 | 功能描述:DC/DC 开关控制器 TEA1771T/SO24/REEL13DP//N2 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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