TEA1791T
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?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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制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:GreenChip synchronous rectifier controller
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功能描述:DC/DC 开关控制器 20V 0.45W 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
TEA1792TS/1
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功能描述:DC/DC 开关控制器 20V 0.27W 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
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