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UCC283TDTR-3G3 Datasheet(PDF) 6 Page - Texas Instruments |
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UCC283TDTR-3G3 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 22 page UCC283-3, UCC283-5, UCC283-ADJ, UCC383-3, UCC383-5, UCC383-ADJ LOW DROPOUT 3A LINEAR REGULATOR FAMILY SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION PEAK CURRENT LIMIT OVER− CURRENT THRESHOLD OVERLOAD OUTPUT CURRENT IO (NOM) VO(NOM) ROLICL OUTPUT VOLTAGE TON TON 32 TON 32 TON TON 32 TON Figure 1. UCC383 Short-Circuit Timing A capacitive load on the regulator’s output appears as a short-circuit during start-up. If the capacitance is too large, the output voltage does not come into regulation during the initial tON period and the UCC383 enters pulsed mode operation. The peak current limit, tON period, and load characteristics determine the maximum value of output capacitor that can be charged. For a constant current load the maximum output capacitance is given as follows: C OUT(max) + I CL * I LOAD t ON V OUT Farads For worst case calculations, the minimum values of on time (tON) and peak current limit (ICL) should be used. The adjustable version allows the tON time to be adjusted with a capacitor on the CT pin: t ON(adj) + 750, 000 C ( m Farad) microseconds For a resistive load (RLOAD) the maximum output capacitor can be estimated from: C OUT(max) + t ON(sec) R LOAD n 1 1 * VOUT I CL R LOAD Farads (1) (2) (3) |
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