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LT6656 Datasheet(PDF) 10 Page - Linear Integrated Systems |
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LT6656 Datasheet(HTML) 10 Page - Linear Integrated Systems |
10 / 22 page LT6657 10 6657fb For more information www.linear.com/LT6657 Turn-On and Line Transient Response The turn-on time is slew-limited and determined by the short-circuit current, the output capacitor, and the output voltage value as determined by the equation: tON = VOUT • COUT ISC For example, the LT6657-2.5V, with a 1µF output capaci- tor and a typical current limit of 15mA the turn-on time would be: tON = 2.5V • 1µF 15mA = 167µs The resulting turn-on time is shown in Figure 1. 50µs/DIV VIN 1V/DIV GND VOUT 1V/DIV GND 6657 F01 COUT = 1µF Figure 1. 2.5V Turn-On Characteristics Line transient response with a 1µF output capacitor and no output current is shown in Figure 2. The peak voltage output response is less than 1mV. 50µs/DIV VIN 0.2V/DIV 3V/DC VOUT 2mV/DIV 2.5V/DC 6657 F02 COUT = 1µF, IOUT = 0mA Figure 2. Line Transient Response with VIN = 0.4VP-P Increasing the output load speeds up the response (Figure 3). 50µs/DIV VIN 0.2V/DIV 3V/DC VOUT 2mV/DIV 2.5V/DC 6657 F03 COUT = 1µF, IOUT = 1mA SOURCING Figure 3. Line Transient Response with VIN = 0.4VP-P A larger output capacitor lowers the amplitude response with a longer time response trade-off (Figure 4). VIN 0.5V/DIV 3V/DC VOUT 2mV/DIV 2.5V/DC 6657 F04 COUT = 10µF, IOUT = 0mA 50µs/DIV Figure 4. Line Transient Response with VIN = 1VP-P Load Transient Response ThetestcircuitofFigure5isusedtomeasureloadtransient response with various currents. CIN 0.1µF VIN = 3V COUT 1µF VOUT VGEN 6657 F05 2 3 6 4 1k LT6657 OUT IN GND SHDN Figure 5. Transient Load Test Circuit applicaTions inForMaTion |
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