SLVU405 Datasheet, PDF (4/14 Pages) Texas Instruments – TPS7A30-49EVM-567

Test Results
5 Test Results
This section provides typical performance waveforms for the TLV710xxEVM PCB.
www.ti.com
5.1 Turnon Output Ramp: Negative Voltage LDO, TPS7A3001 Circuit
Figure 2 shows the turnon waveforms where the Enable is connected to the –VIN. The –VIN turnon
voltage steps down to –18 V (shown on Ch2 of the Figure 2 plot) followed by the –VOUT which ramps
down –15 V. This negative-going turnon ramp represents the effects of both the soft-start capacitor, C_SS,
as well as the soft-start effect contributed by the bypass capacitor, C_BYP, across the upper feedback
resistor.
Ch1(–VOUT), Ramp Down to -15.V, and Ch2 (–VIN), Input Step Turnon Voltage to -18V.
Figure 2. TPS7A3001 –VOUT Ramp at Turnon
4
TPS7A30-49EVM-567
Copyright © 2010, Texas Instruments Incorporated
SLVU405 – August 2010