NCP566 ON Semiconductor, NCP566 Datasheet - Page 7

• Manufacturer Part Number: NCP566
• Description: Low Dropout Linear Regulator
• Manufacturer: ON Semiconductor

voltages at currents up to 1.5 A. It features ultra fast transient
response and low dropout voltage. These devices contain
output current limiting, short circuit protection and thermal
shutdown protection.
Input, Output Capacitor and Stability
transient response or if the regulator is located more than a
few inches from the power source. This will reduce the
circuit’s sensitivity to the input line impedance at high
frequencies and significantly enhance the output transient
response. Different types and different sizes of input
capacitors can be chosen dependent on the quality of power
supply. A 150 mF OSCON 16SA150M type from Sanyo
should be adequate for most applications. The bypass
capacitor should be mounted with shortest possible lead or
track length directly across the regulator’s input terminals.
remains stable with ceramic, tantalum, and aluminum−
electrolytic capacitors with a minimum value of 1.0 mF with
ESR between 50 mW and 2.5 W. The NCP566 is optimized
The NCP566 low dropout linear regulator provides fixed
An input bypass capacitor is recommended to improve
The output capacitor is required for stability. The NCP566
APPLICATION INFORMATION
Pulse
Figure 17. Schematic for Transient Response Measurement
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+
GEN
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GND
http://onsemi.com
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CC
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Scope Voltage Probe
NCP566
Evaluation Board
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NCP566
for use with a 150 mF OSCON 16SA150M type in parallel
with a 10 mF OSCON 10SL10M type from Sanyo. The
10 mF capacitor is used for best AC stability while 150 mF
capacitor is used for achieving excellent output transient
response. The output capacitors should be placed as close as
possible to the output pin of the device. If not, the excellent
load transient response of NCP566 will be degraded.
Load Transient Measurement
microprocessor applications. Therefore good load transient
performance is required for the power stage. NCP566 has
the feature of ultra fast transient response. Its load transient
responses in Figures 11 through 14 are tested on evaluation
board shown in Figure 17. The evaluation board consists of
NCP566 regulator circuit with decoupling and filter
capacitors and the pulse controlled current sink to obtain
load current transitions. The load current transitions are
measured by current probe. Because the signal from current
probe has some time delay, it causes un−synchronization
between the load current transition and output voltage
response, which is shown in Figures 11 through 14.
Large load current changes are always presented in
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GND
out
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RL