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XC9504B093DAR Datasheet(PDF) 9 Page - Torex Semiconductor |
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XC9504B093DAR Datasheet(HTML) 9 Page - Torex Semiconductor |
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9 / 53 page  9/53 XC9504 Series < Output Voltage Setting, Ch.1 (Step-Up DC/DC Converter Controller) > Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based on the values of RFB11 and RFB12. The sum of RFB11 and RFB12 should normally be 1 M Ω or less. VOUT1=0.9 ×(RFB11+RFB12)/RFB12 The speed-up capacitor for phase compensation's (CFB1) value should be adjusted using the formula fzfb=1/(2 ×π× CFB1 ×RFB11) so that it equals 12kHz. Depending on the application, the inductance value L, and the load capacity value CL, adjustments to this value are suggested so that the value is somewhere between 1kHz to 50kHz. [Calculation Example] When RFB11 = 470k Ω and RFB12 = 30kΩ : VOUT1 = 0.9×(470k+30k) / 30k = 15.0V. VOUT (V) RFB11 (k Ω) RFB12 (k Ω) CFB1 (pF) VOUT (V) RFB11 (k Ω) RFB12 (k Ω) CFB1 (pF) VOUT (V) RFB11 (k Ω) RFB12 (k Ω) CFB1 (pF) 1.5 220 330 62 2.7 360 180 33 10.0 680 68 18 1.8 220 220 62 3.0 560 240 24 12.0 160 13 82 2.0 330 330 39 3.3 200 75 62 15.0 470 30 27 2.2 390 390 33 5.0 82 18 160 20.0 470 22 27 2.5 390 390 33 8.0 120 15 100 30.0 390 12 34 [Typical Example] < Output Voltage Setting, Ch. 2 (Inverting DC/DC Converter) > Output voltage can be set by adding reference voltage and split resistors externally. Output voltage is determined using the following equation and is based on the values of RFB21 and RFB22. The sum of RFB21 and RFB22 should normally be 200k Ω or less. The equation uses Ch 1's (VOUT1) output voltage calculation method for the reference voltage. VOUT2 = (0.9-VOUT1) × (RFB21/RFB22) + 0.9V [Calculation Example] When RFB21 =17.5k Ω, RFB22 =10kΩ, VOUT1 =3.3V, VOUT2 = - 3.3V The value of speed-up capacitor for phase compensation CFB21: [Conditions: Heavy load (when coil current is continuous.)] fzfb2 = 1/2 ×π×CFB21×RFB21) = 10kHz Depending on the application, the inductance value L, and the load capacity value CL, adjustments to this value are suggested so that the value is somewhere between 1kHz to 50kHz. [Conditions: Light load (when coil current is discontinuous.)] Less than CFB21=0.1 μF Depending on the application, the inductance value L, and the load capacity value CL, adjustments to this value are suggested. > Example Circuit 1: Using voltage of Ch 1 (Step-Up) > Example Circuit 2: Using a positive regulator Channel 1 (Step-Up) circuits should be enable by setting EN1 to High level so that a stable voltage is provided. Inrush current to the inverter when the supply voltage VDD of the IC is 2.0 V or higher can be controlled by setting EN 1 and EN 2 to enable (“H” level) simultaneously. A stable positive voltage produced by a positive voltage regulator or by other means is usable. VOUT2 = (0.9 - VROUT) x (RFB21 / RFB22) + 0.9V SBD2 RFB21 CFB21 VOUT2 CL2 RFB22 FB2 Inside of XC9504 IC VR To the other circuit VR_OUT SBD2 RFB21 CFB21 VOUT2 CL2 RFB22 VOUT1 FB2 Inside of XC9504 IC ■OPERATIONAL EXPLANATION (Continued) |
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