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Y5117XX-T2 Datasheet(PDF) 8 Page - Power-One |
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Y5117XX-T2 Datasheet(HTML) 8 Page - Power-One |
8 / 14 page Y5117 17A DC-DC POL Data Sheet 3.0V to 13.2V Input • 0.7V to 3.63V Output REV. 2.6 APR 07, 2005 www.power-one.com 6. Feature Description 6.1 Enable This function allows the converter to be turned on or off remotely. The Enable pin is internally pulled up to the input voltage. It is recommended to control the Enable pin with an open collector transistor. The saturation voltage of the transistor shall be less than 0.55V at 1mA to reliably turn the converter OFF. Page 8 of 14 The Enable pin of Y5117P can be left floating, if not used. The Enable pin of Y5117PC shall be pulled low until the input voltage reaches 6V. 6.2 Internal Supply Voltage (VLDO) If the input voltage is lower than 5.2V, then the VLDO pin is required to be connected to an external voltage source ( ≥5.2V). This voltage should not exceed 15V and be capable of supplying 60mA. 6.3 Undervoltage Lockout The undervoltage lockout scheme monitors the input voltage applied to it and does not allow the converter to start when VIN is less than the UVLO threshold. When the input voltage is higher than 5.2V, the VLDO pin is connected to the input voltage. When the input voltage is below 5.2V, the VLDO pin is connected to an external voltage source. UVLO turn-on threshold is then set with the 10kOhm resistor connected between the Enable pin and the ground as shown in Figure 12. 6.4 Output Voltage Trim The output voltage is preset to 1.3V. The trim feature allows the user to adjust the output voltage from this nominal value. Increase VOUT: Trim range 1.3V < VOUT ≤ 3.63V. An external resistor (RTU) is placed between the Trim pin and the –Vs (negative voltage sense) pin. RTU = 137.5/(VOUT-1.3), kΩ Decrease VOUT: Trim range 0.7V ≤ VOUT < 1.3V. An external resistor (RTD) is placed between Trim pin and VREF pin. RTD = 110(VREF – 1.25) / (1.3 – VOUT) kΩ Note that VOUT cannot exceed 0.7VIN. An internal 5V (+/-2.5%) reference voltage is available from VREF (pin 19). Alternatively, an external reference voltage can be used for better accuracy (typically 1%). The external reference voltage should be in the range from 1.26V to 5.5V and capable of supplying 1mA. Table 1. Sample Trim Resistance Values VOUT (V) RTD (kΩ) RTU (kΩ) 0.7 686.36, (VREF = 5V) 1.0 1370, (VREF = 5V) 1.25 8088, (VREF = 5V) 1.3 ------ None – factory default ----- 1.5 690.95 2.5 114.68 3.3 68.78 6.5 Output Current Limit When the output load exceeds the current limit threshold, the converter will enter a low power hiccup mode. Once the overcurrent is removed, the output voltage will recover automatically. 6.6 Output Current Limit Adjustment The OCP adjustment function allows greater flexibility to set the output current limit inception point (ILIM), from default of 22A to a minimum of 14.8A using an external resistor and a capacitor. To adjust the ILIM, place the resistor ROCP between OCPA and OCPB pins, and the capacitor COCP between OCPA and Vout pins. Do not short OCPA directly to OCPB. To calculate ROCP and COCP, use the equations below: ROCP = 10(ILIM -12.6) / (22.8 - ILIM ), kΩ COCP = 414.4/ROCP - 26, nF, where ROCP is on kΩ Table 2. Sample Standard Values for ROCP and COCP ILIM ROCP COCP ~22A Open None ~20A 26.7k Ω None ~17A 7.5k Ω 27nF ~13.5A 1k Ω 390nF 6.7 Remote Voltage Sense This feature provides improved load regulation by compensating for the voltage drop between the output of the converter and the load. |
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