 English |
|
|
|
|
|
|
|
| UCC28251 Datasheet, PDF (38/54 Pages) Texas Instruments – Advanced PWM Controller With Pre-Bias Operation | |||
| |||
| ◁ |
UCC28251
SLUSBD8D â FEBRUARY 2013 â REVISED APRIL 2013
www.ti.com
Peak Current Mode Control
For peak current mode control, RAMP/CS pin is connected directly with the current signal generated from a
current transformer. The current signal must be compatible with the input range of the COMP pin. External slope
compensation is required to prevent sub-harmonic oscillation and to maintain flux-balance. The slope
compensation can be implemented by using OUTA and OUTB to charge external capacitors and use the voltage
follower to add into the sensed the current signal, as shown in Figure 44. Follow the peak current mode control
theory to select compensation slope or refer to âModeling, Analysis and Compensation of the Current-Mode
Converterâ, (TI Literature Number SLUA101).
Transformer Primary Side
Current
CT
RS
CS
1:n
OUTA
OUTB
UCC28251
VREF
RAMP/CS
BLANK
Figure 44. UCC28251 Set Up for Peak Current Mode Control
38
Submit Documentation Feedback
Product Folder Links: UCC28251
Copyright © 2013, Texas Instruments Incorporated
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese