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부품번호 | NCP566 기능 |
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기능 | Low Dropout Linear Regulator | ||
제조업체 | ON Semiconductor | ||
로고 | |||
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NCP566
1.5 A Low Dropout
Linear Regulator
The NCP566 low dropout linear regulator will provide 1.5 A at a
fixed output voltage. The fast loop response and low dropout voltage
make this regulator ideal for applications where low voltage and good
load transient response are important. Device protection includes
current limit, short circuit protection, and thermal shutdown.
Features
• Ultra Fast Transient Response (t1.0 ms)
• Low Ground Current (1.5 mA @ Iout = 1.5 A)
• Low Dropout Voltage (0.9 V @ Iout = 1.5 A)
• Low Noise (37 mVrms)
• 1.2 V, 1.8 V, 2.5 V Fixed Output Versions.
Other Fixed Voltages Available on Request
• Current Limit Protection
• Thermal Shutdown Protection
• These are Pb−Free Devices
Typical Applications
• Servers
• ASIC Power Supplies
• Post Regulation for Power Supplies
• Constant Current Source
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MARKING
DIAGRAMS
SOT−223
CASE 318E
AYM
566xx G
G
1
xx =
A=
Y=
M=
G=
Voltage Rating
12 = 1.2 V
18 = 1.8 V
25 = 2.5 V
Assembly Location
Year
Date Code
Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
Vin 1
GND 2
Vout 3
GND
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
© Semiconductor Components Industries, LLC, 2007
March, 2007 − Rev. 0
1
Publication Order Number:
NCP566/D
NCP566
TYPICAL CHARACTERISTICS
2.53
2.52
2.51
2.50
2.49
2.48
2.47
−50 −25
0
Vout = 2.5 V
Iout = 10 mA
25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 2. Output Voltage vs. Temperature
1.820
1.815
1.810
1.805
1.800
1.795
1.790
1.785
1.780
−50
−25
0
Vout = 1.8 V
Iout = 10 mA
25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 3. Output Voltage vs. Temperature
1.220
1.215
1.210
1.205
1.200
1.195
1.190
1.185
1.180
−50 −25
0
Vout = 1.2 V
Iout = 10 mA
25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 4. Output Voltage vs. Temperature
1.2
3.80
3.75
3.70
3.65
3.60
3.55
3.50
−50 −25 0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 5. Short Circuit Current Limit
vs. Temperature
150
1.0
Iout = 1.5 A
0.8
0.6 Iout = 50 mA
0.4
0.2
0
−50 −25
0
25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 6. Dropout Voltage vs. Temperature
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APPLICATION INFORMATION
The NCP566 low dropout linear regulator provides fixed
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
An input bypass capacitor is recommended to improve
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.
The output capacitor is required for stability. The NCP566
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
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
Large load current changes are always presented in
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.
GEN
Vout
Pulse
−VCC
Vin
+
NCP566
Evaluation Board
V
GND
RL
+
GND
Scope Voltage Probe
Figure 17. Schematic for Transient Response Measurement
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