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XC9119D10AML Datasheet(PDF) 9 Page - Torex Semiconductor |
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XC9119D10AML Datasheet(HTML) 9 Page - Torex Semiconductor |
9 / 16 page 9 XC9119D10A Series VOUT (V) RFB1 (k Ω) RFB2 (k Ω) CFB (pF) 3.3 300 130 1000 5.0 300 75 1000 7.0 180 30 1800 10.0 270 30 1200 15.0 510 36 510 18.0 510 30 510 ■ OPERATIONAL EXPLANATION (Continued) <Lx (Pin No. 1): Switch Pin> Please connect the anode of an Schottky barrier diode and inductor to the Lx pin. <FB (Pin No. 3): Voltage Feedback Pin> The reference voltage is 1.0V (TYP.). Output voltage is approximated by the following equation according to the value for two resistors (RFB1 and RFB2). The sum of the two resistors should be 1M Ω or less. VOUT = RFB1 / RFB2 + 1 Output voltage should be set as to fill VOUT<(Maximum value of VLx) – (VF of Schottky diode). Please adjust the CFB value of the speed–up capacitor for phase compensation so that fzfb=1/(2πx CFB x RFB1) will be about 500Hz. According to the usage, adjusting the inductance value, the load capacity value, and so on to the most suitable operation. Typical example: <VDD (Pin No. 5): Power Supply Pin> Please connect an input by-pass capacitor (CIN). ● Application Information ■ NOTES ON USE 1. Please do not exceed the value of stated absolute maximum ratings. 2. The DC/DC converter performance is greatly influenced by not only the ICs’ characteristics, but also by those of the external components. Care must be taken when selecting the external components. 3. Make sure that the PCB GND traces are as thick as possible, as variations in ground potential caused by high ground currents at the time of switching may result in instability of the IC. 4. Please mount each external component as close to the IC as possible and use thick, short connecting traces to reduce the circuit impedance. 5. Please set up the output voltage value so that the Lx pin voltage does not exceed 20V. VDD Lx CE/SS FB VSS L VIN CL 10uF SD RFB2 CIN 4.7uF RFB1 CFB RSS CSS VDD 2.5V~6V CDD <Obtaining VDD from other source than VIN> In case that the input voltage VIN and power source VDD in the step-up circuit are isolated, the circuit starts step-up operations with the input voltage less than 2.5V when voltage from 2.5V to 6.0V is applied to the power source. Please connect more than 1uF of CDD between the VDD pin and the VSS pin as close as possible. Ex.) When VDD=3.6V, VIN=1.8V, VOUT=5.0V (RFB1=300k Ω, RFB2=75kΩ, CFB=1000pF, CL=10uF), the IC can operate up to IOUT=40mA. |
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