参数资料
型号: UCC2891DR
厂商: Texas Instruments
文件页数: 25/41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
ADDITIONAL APPLICATION INFORMATION
While the same arrangement can be used in a forward type converter, the bootstrap winding off the main power
transformer would not be able to provide a quasi-regulated voltage. In the forward converter, the voltage across
the bootstrap winding equals the input voltage times the turns ratio. Accordingly the bias voltage would vary with
the input voltage and most likely would exceed the maximum operating voltage of the control circuits at high
line. A linear regulator can be used to limit and regulate the bias voltage if the power dissipation is acceptable.
Another possible solution for the forward converter is to generate the bias voltage from the output inductor as
shown in Figure 13.
Bootstrap Bias 1
+VIN
16
VIN
LOAD
VDD
UCC2891
14
CBIAS
CIN
Synchronous
GND
QMAIN
Rectifier
Control
?VIN
6
UDG?03155
Figure 12. Bootstrap Bias 1, Flyback Example
This solution uses the regulated output voltage across the output inductor during the freewheeling period to
generate a quasi-regulated bias for the control circuits.
Bootstrap Bias 2
+VIN
16
VIN
LOAD
VDD
14
CIN
UCC2891
GND
6
CBIAS
QMAIN
Synchronous
Rectifier
Control
?VIN
UDG?03156
Figure 13. Bootstrap Bias 2, Forward Example
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