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LT1933HDCB-TR Datasheet(PDF) 10 Page - Linear Technology |
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LT1933HDCB-TR Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  LT1933 10 1933fd APPLICATIONS INFORMATION Figure 1 shows the transient response of the LT1933 with several output capacitor choices. The output is 3.3V. The load current is stepped from 100mA to 400mA and back to 100mA, and the oscilloscope traces show the output volt- age. The upper photo shows the recommended value. The second photo shows the improved response (less voltage drop) resulting from a larger output capacitor and a phase lead capacitor. The last photo shows the response to a high performance electrolytic capacitor. Transient performance is improved due to the large output capacitance, but output ripple (as shown by the broad trace) has increased because of the higher ESR of this capacitor. Figure 1. Transient Load Response of the LT1933 with Different Output Capacitors as the Load Current is Stepped from 100mA to 400mA. VIN = 12V, VOUT = 3.3V, L = 22μH. 22μF FB 16.5k 10k VOUT 1933 F01a VOUT 50mV/DIV IOUT 200mA/DIV VOUT 50mV/DIV IOUT 200mA/DIV FB VOUT 1933 F01b 16.5k 10k 22μF 2x 470pF VOUT 50mV/DIV IOUT 200mA/DIV SANYO 4TPB100M FB 1933 F01c VOUT + 16.5k 10k 100μF |
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