Datasheet

50mV/div

20 s/divm

500W

ExternalFET

NoFilter

500W

10nF

ExternalFET

LoadCapacitor

50mV/div

20 s/divm

XTR111

www.ti.com

SBOS375C –NOVEMBER 2006– REVISED JUNE 2011

DYNAMIC PERFORMANCE The output glitch magnitude depends on the

mismatch of the internal current sources. It is

The rise time of the output current is dominated by

approximately proportional to the output current level

the gate capacitance of the external FET.

and scales directly with the load resistor value. It will

differ slightly from part to part. The effects of filtering

The accuracy of the current mirror relies on the

the output are shown in Figure 40 and Figure 41.

dynamic matching of multiple individual current

sources. Settling to full resolution may require a

complete cycle lasting around 100μs. Figure 39

shows an example of the ripple generated from the

individual current source values that average to the

specified accuracy over the full cycle.

Figure 39. Output Noise without Filter into 500Ω

Figure 40. Output with 10nF Parallel to 500Ω