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TEA1751T_LT_2
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02  23 December 2009
6 of 29
NXP Semiconductors
TEA1751T; TEA1751LT
GreenChip III SMPS control IC
As soon as the flyback converter is started, the voltage on the FBCTRL pin is monitored. If
the output voltage of the flyback converter does not reach its intended regulation level in a
predefined time, the voltage on the FBCTRL pin reaches the V
to(FBCTRL)
 level and an error
is assumed. The TEA1751 then initiates a safe restart, while in the TEA1751L the
protection is latched.
When one of the protection functions is activated, both converters stop switching and the
V
CC
 voltage drops to V
th(UVLO)
. A latched protection recharges the capacitor C
VCC
 via the
HV pin, but does not restart the converters. For a safe restart protection, the capacitor is
recharged via the HV pin and the device restarts (see block diagram, Figure 1
).
In the event of an overvoltage protection of the PFC circuit, V
VOSENSE
> V
ovp(VOSENSE)
,
only the PFC controller stops switching until the VOSENSE pin voltage drops below
V
OVP(VOSENSE)
 again. Also, if a mains undervoltage is detected
V
VINSENSE
< V
stop(VINSENSE)
, only the PFC controller stops switching until
V
VINSENSE
> V
start(VINSENSE)
 again.
When the voltage on pin V
CC
 drops below the undervoltage lockout level, both controllers
stop switching and reenter the safe restart mode. In the safe restart mode the driver
outputs are disabled and the V
CC
 pin voltage is recharged via the HV pin.
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相关代理商/技术参数
TEA1751T/N1518 制造商:NXP Semiconductors 功能描述:IC SMPS SOIC-16
TEA1752LT 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:GreenChip III SMPS control IC
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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
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