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LT1613 数据表(PDF) 7 Page - Linear Technology |
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LT1613 数据表(HTML) 7 Page - Linear Technology |
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7 / 12 page  7 LT1613 OPERATIO resulting in a severely underdamped response. By adding R3 and CPL as detailed in Figure 8’s schematic, phase margin is restored, and transient response to the same load step is pictured in Figure 9. R3 isolates the device FB pin from fast edges on the VOUT node due to parasitic PC trace inductance. Figure 10’s circuit details a 5V to 12V boost converter, delivering up to 130mA. The transient response to a load step of 10mA to 130mA, without CPL, is pictured in Figure 11. Although the ringing is less than that of the previous example, the response is still underdamped and can be improved. After adding R3 and CPL, the improved transient response is detailed in Figure 12. Figure 13 shows a SEPIC design, converting a 3V to 10V input to a 5V output. The transient response to a load step of 20mA to 120mA, without CPL and R3, is pictured in Figure 14. After adding these two components, the im- proved response is shown in Figure 15. effect on loop stability, as long as minimum capacitance requirements are met). The transient response to a load step of 50mA to 100mA is pictured in Figure 6. Note the “double trace,” due to the ESR of C2. The loop is stable and settles in less than 100 µs. In Figure 7, C2 is replaced by a 10 µF ceramic unit. Phase margin decreases drastically, VIN VOUT 5V 1613 F05 SW L1 10 µH D1 GND LT1613 C1: AVX TAJA156M010R C2: AVX TAJA226M006R D1: MOTOROLA MBR0520 L1: MURATA LQH3C100 R2 12.1k R1 37.4k FB SHDN C1 15 µF VIN 2.5V + C2 22 µF + SHDN Figure 5. 2.5V to 5V Boost Converter with “A” Case Size Tantalum Input and Output Capacitors VIN VOUT 5V CPL 330pF 1613 F08 SW L1 10 µH D1 GND LT1613 C1: AVX TAJA156M010R C2: TAIYO YUDEN LMK325BJ106MN D1: MBR0520 L1: MURATA LQH3C100K04 R2 12.1k R3 10k R1 37.4k FB SHUTDOWN C1 15 µF VIN 2.5V C2 10 µF SHDN + VOUT 20mV/DIV AC COUPLED LOAD CURRENT 100mA 50mA 200 µs/DIV 1613 F06 Figure 6. 2.5V to 5V Boost Converter Transient Response with 22 µF Tantalum Output Capacitor. Apparent Double Trace on VOUT Is Due to Switching Frequency Ripple Current Across Capacitor ESR VOUT 20mV/DIV AC COUPLED LOAD CURRENT 100mA 200 µs/DIV 1613 F07 50mA Figure 7. 2.5V to 5V Boost Converter with 10 µF Ceramic Output Capacitor, No CPL Figure 8. 2.5V to 5V Boost Converter with Ceramic Output Capacitor. CPL Added to Increase Phase Margin, R3 Isolates FB Pin from Fast Edges VOUT 20mV/DIV AC COUPLED LOAD CURRENT 100mA 200 µs/DIV 1613 F09 50mA Figure 9. 2.5V to 5V Boost Converter with 10 µF Ceramic Output Capacitor, 330pF CPL and 10k in Series with FB Pin |
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