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| SLVU405 Datasheet, PDF (5/14 Pages) Texas Instruments – TPS7A30-49EVM-567 | |||
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www.ti.com
Test Results
5.2 Turnon Output Ramp: Positive Voltage LDO, TPS7A4901 Circuit
Figure 3 shows the turnon waveforms where the Enable is connected to the +VIN. The +VIN turnon
voltage steps to +18 V (shown on Ch2 of the Figure 2 plot) followed by the +VOUT ramp up to +15 V. This
positive-going turnon ramp represents the effects of both the soft-start capacitor, CSS, as well as the
soft-start effect contributed by the bypass capacitor, CBYP, across the upper feedback resistor.
Ch1(+VOUT), Ramp Up to +15.V, and Ch2 (+VIN), Input Step Turnon Voltage to +18V
Figure 3. TPS7A4901 +VOUT Ramp at Turnon
5.3 âVOUT Load Transient Applied to the Negative LDO Circuit, TPS7A3001
Figure 4 shows the load transient response â oscilloscope channel 1 â for a 10-mA to 150-mA load
transient applied to âVOUT (â15-V output). Oscilloscope channel 4 shows the load current transient.
SLVU405 â August 2010
Copyright © 2010, Texas Instruments Incorporated
TPS7A30-49EVM-567
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