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UCC28250 Datasheet(PDF) 22 Page - Texas Instruments |
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UCC28250 Datasheet(HTML) 22 Page - Texas Instruments |
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22 / 50 page  ILIM HICC UCC28250 C HICC C S R S CT 1:n Transformer Primary Side Current S PK 0.5 V n R I ´ = S S 100 ns C R = UCC28250 SLUSA29B – APRIL 2010 – REVISED OCTOBER 2010 www.ti.com ILIM (Current Limit for Cycle-By-Cycle Over-Current Protection) (17/4) Cycle-by-cycle current limit is accomplished using the ILIM pin for current mode control or for voltage mode control. The input to the ILIM pin represents the primary current information. If the voltage sensed at ILIM pin exceeds 0.5 V, the current sense comparator terminates the pulse of output OUTA or OUTB. If the high current condition persists, the controller operates in a cycle-by-cycle current limit mode with duty cycle determined by the current sense comparator instead of the PWM comparator. ILIM pin is pulled down by an internal switch at the rising edge of every clock cycle. This internal switch remains on for an additional 70 ns after OUTA or OUTB goes high to blank leading edge transient noise in the current sensing loop. This reduces the filtering requirements at the ILIM pin and improves the current sense response time. Figure 15. Current Limit Circuit Once the over current protection level IPK is selected, the current transformer turns ratio and the burden resistor value can be decided as: (11) In this equation, current transformer turns ratio is 1:n and RS is the burden resistor value. Some filtering capacitance is required to reduce the sensing noise. Choose the RC constant at about 100 ns, and calculate the capacitor value as: (12) The cycle-by-cycle current limit operation time before all four outputs shut down can be programmed by external capacitor CHICC at HICC pin. (See HICC pin description) 22 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UCC28250 |
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