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XC9220B09AML Datasheet(PDF) 9 Page - Torex Semiconductor |
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XC9220B09AML Datasheet(HTML) 9 Page - Torex Semiconductor |
9 / 22 page 9/22 XC9220/XC9221 Series ● Output Voltage Setting Output voltage can be set by adding split resistors. Output voltage is determined by the following equation, based on the values of RFB1 and RFB2. The sum of RFB1 and RFB2 should normally be 1MΩ or less. VOUT = 0.9 x (RFB1 + RFB2) / RFB2 The value of CFB, speed-up capacitor for phase compensation, should be adjusted by the following equation. Fzfb should usually be 5kHz. Adjustments are required from 1kHz to 20kHz depending on the application, value of inductance (L), and value of load capacity (CL). CFB = 1 / (2 x π x RFB1 x fzfb) [Sample calculation: Setting 3.3V VOUT] RFB1 = 200k Ω, RFB2=75kΩ, VOUT = 0.9 x (200k + 75k) / 75k = 3.300V CFB = 1 / (2 x π x 200k x 5k) =150pF [Typical examples] VOUT (V) RFB1 (kΩ) RFB2 (kΩ) CFB (pF) VOUT (V) RFB1 (kΩ) RFB2 (kΩ) CFB (pF) 1.2 100 300 330 3.3 200 75 150 1.5 180 270 180 5.0 150 33 220 1.8 220 220 150 12.0 160 13 180 IOUT UP TO 500mA UP TO 1A UP TO 2A UP TO 3A P-ch MOSFET (*1) CPH3308 (SANYO) 2SJ616 (SANYO) 2SJ646 (SANYO) Schottky Barrier Diode (SBD) (*2) XB01SB04A2BR (TOREX) D1FH3 (SHINDENGEN) CMS02 (TOSHIBA) DE5PC3 (SHINDENGEN) *1: Recommended to use P-ch MOSFET with Ciss less than 1500pF. *2: SBD should be used with high-toned reverse characteristics. OUTPUT VOLTAGE RSENSE (mΩ) VOUT≦2.5V 100 VOUT>2.5V 50 ● Recommended MOSFET and SBD (Examples) ● Ceramic Capacitor With the XC9220/9221 series, a ceramic capacitor can be used as an output capacitor (CL). RSENSE resistor is required for using the ceramic capacitor. The value of RSENSE resistor is determined depending on the setting output voltage as the chart below. <External Components> P-ch MOSFET: 2SJ646 (SANYO) SBD: DE5PC3 (SHINDENGEN) L: CDRH8D28-4R7 (4.7μH, SUMIDA / Fosc=1.0MHz) CDRH8D43-100 (10μH, SUMIDA / Fosc=500kHz) CDRH127-220 (22μH, SUMIDA / Fosc=300kHz) CIN: 22μF (ceramic) CL: 22μF (ceramic / Fosc=1.0MHz, 500kHz) 47μF (ceramic / Fosc=300kHz) RSENSE: 100mΩ (VOUT≦2.5V) 50mΩ (VOUT>2.5V) ■OPERATIONAL EXPLANATION (Continued) |
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