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TS1581 Arkusz danych(PDF) 5 Page - Taiwan Semiconductor Company, Ltd

Numer części TS1581
Szczegółowy opis  5A Dual Input LDO
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Producent  TSC [Taiwan Semiconductor Company, Ltd]
Strona internetowa  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS1581 Arkusz danych(HTML) 5 Page - Taiwan Semiconductor Company, Ltd

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TS1581
5A Dual Input LDO
5/9
Version: A07
Application Information (Continue)
Stability
The circuit design used in the TS1581 Series requires the use of an output capacitor as part of the device frequency
compensation. The addition of 150uF aluminum electrolytic or a 22uF solid tantalum on the output will ensure stability
for all operating conditions. In order to meet the transient performance of the processor larger value capacitors are
needed. To limit the high frequency noise generated by the processor high quality bypass capacitors must be used. In
order to limit parasitic inductance (ESL) and resistance (ESR) in capacitors to acceptable limits, multiple small ceramic
capacitors in addition to high quality solid tantalum capacitors are required.
When the adjustment terminal is bypass to improve the ripple rejection, the requirement for an output capacitor
increases. The Adjust pin is brought out on the fixed voltage device specifically to allow this capability. To further
improve stability and transient response of these devices larger values of output capacitor can be used. The modern
processors generate large high frequency current transients. The load current step contains higher order frequency
components than the output coupling network must handle until the regulator throttles to the load current level.
Because they contain parasitic resistance and inductance, capacitors are not ideal elements. These parasitic elements
dominate the change in output voltage as the beginning of a transient load step change. The ESR of the output
capacitors produces and instantaneous step in output voltage
ΔV = ΔI (ESR). The ESL of the output capacitors produces a drop proportional to the rate of change of the output
current V = L (ΔI / Δt). the output capacitance produces a change in output voltage proportional to the time until the
regulator can respond ΔV = Δt (ΔI / C).
Output Voltage
The TS1581 (adjustable version) develops a 1.25V reference voltage between the Sense Pin and the Adjust Pin
(Figure 5). Placing a resistor between these two terminals causes a constant current to flow though R1 and down
though R2 to set the output voltage. In general R1 is chosen so that this current is the specified minimum load current
of 10mA. The current out of the Adjust pin is small, typically 50uA and it adds to the current from R1.For best regulation
the top of the resistor divider should be connected directly to the Sense pin.
Figure 5. Setting Output Voltage
Figure 6. Optional Clamp Diodes Protect
Against Input Crowbar Circuits


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