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UCC2541 Datasheet(PDF) 10 Page - Texas Instruments |
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UCC2541 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 43 page UCC2541 SLUS621A − AUGUST 2004 − SEPTEMBER 2005 10 www.ti.com APPLICATION INFORMATION RLOAD RS RI1 RV1 RI2 RV2 RFI CFI RFV CFV ZFV ZIV CFIR VERR to 1.5 V VEA− 7 8 9 CEA− UCC2541 + + + Voltage Error Amplifier COMP Modulator Current Error Amplifier C + SS TR R + 1.5 R 50 mV ZFV ZIV From Power MOSFET Switch Node 1.5 V Inverting Amplifier 0.7 V CST Figure 3. Error Amplifier Configuration Component selection includes setting the voltage regulation threshold, then the current limit threshold, as described below. Voltage vs. Current Programming (refer to Figure 3): 1. Determine the ratio R V1 R V2 + V LOAD(reg) V VEA * ) Threshold Voltage * 1V + V LOAD(reg) 1.5 V (typ) * 1V 2. Sense resistor R S + 1 ) R V1 R V2 V CEA )offset voltage I S(max) , where IS(max) is the current limit level, VCEA+offset = 50 mV (typ). 3. Arbitrarily select either RV1 or RV2 so that the smallest of the two resistors is between 6.5 kΩ and 20 kΩ. Then calculate the value of the other resistor using the equation in the first step. If the converter is in a current-limit condition and the output voltage falls below half of the regulated output voltage, the UCC2541 enters into a hiccup (restart-retry) mode. Figure 4 shows typical signals during hiccup mode. |
Similar Part No. - UCC2541_16 |
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Similar Description - UCC2541_16 |
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