参数资料
型号: UCC2891DR
厂商: Texas Instruments
文件页数: 15/41页
文件大小: 0K
描述: IC REG CTRLR FLYBK ISO CM 16SOIC
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 1MHz
占空比: 74%
电源电压: 8.5 V ~ 16 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
UCC2891, UCC2892
UCC2893, UCC2894
SLUS542F ? OCTOBER 2003 ? REVISED JULY 2009
FUNCTIONAL DESCRIPTION
VOFF
VIN
V CLAMP, MAX
VCLAMP
VSS
TSW
OUT
AUX
Figure 3. Line Undervoltage Shutdown Waveforms, P?Channel
To eliminate this potential hazard the UCC289x controllers safely discharge the clamp capacitor during power
down. The AUX and OUT output continues switching while the soft-start capacitor C SS is being slowly
discharged. Notice that the AUX and OUT pulse width gradually decreases as the clamp voltage decreases
never applying the high voltage across the transformer for extended period of time. From this, the function of
soft stop is achieved.
Line Overvoltage Protection
When the line overvoltage protection is triggered in the UCC2892 and UCC2894 controllers, the gate drive
signals are immediately disabled. At the same time, the slow discharge of C SS is initiated. While the soft-start
capacitor is discharging the gate drive signals remains disabled. Once V SS = 0.5 V and the overvoltage
disappears from the input of the power supply, operation resumes through a regular soft-start of the converter
as it is demonstrated in Figure 4.
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