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PDF NCV8141 Data sheet ( Hoja de datos )
| Número de pieza | NCV8141 | |
| Descripción | 500 mA Linear Regulator | |
| Fabricantes | ON Semiconductor | |
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NCV8141
5.0 V, 500 mA Linear
Regulator with ENABLE,
RESET, and Watchdog
The NCV8141 is a linear regulator suited for microprocessor
applications in automotive environments.
This ON Semiconductor part provides the power for the
microprocessors along with many of the control functions needed in
today’s computer based systems. Incorporating all of these features
saves both cost, and board space.
The NCV8141 provides a low sleep mode current as compared to
the CS8141. Consult your local sales representative for a low sleep
mode current version of the CS8140.
Features
• 5.0 V ± 4.0%, 500 mA Output Voltage
• Lower Quiescent Current
• Improved Filtering for /RESET Functionality
• mP Compatible Control Functions
♦ Watchdog
♦ RESET
♦ ENABLE
• Low Dropout Voltage (1.25 V @ 500 mA)
• Low Quiescent Current (7.0 mA @ 500 mA)
• Low Noise, Low Drift
• Low Current SLEEP Mode 50 mA (max)
• Fault Protection
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♦ Thermal Shutdown
♦ Short Circuit
♦ 60 V Peak Transient Voltage
• Pb−Free Package is Available
• NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
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MARKING
DIAGRAM
D2PAK−7
DPS SUFFIX
CASE 936AB
NC
V8141
AWLYWWG
1
1
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
Tab = GND
Pin 1. VIN
2. ENABLE
3. RESET
4. GND
5. Delay
6. WDI
1 7. VOUT
ORDERING INFORMATION
Device
Package
Shipping†
NCV8141D2T
D2PAK
50 Units/Rail
NCV8141D2TG
D2PAK
(Pb−Free)
50 Units/Rail
NCV8141D2TR4
D2PAK 750/Tape & Reel
NCV8141D2TR4G D2PAK 750/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2006
December, 2006 − Rev. 10
1
Publication Order Number:
NCV8141/D
1 page  
NCV8141
TYPICAL PERFORMANCE CHARACTERISTICS
1.4
1.2
1.0 −40°C
0.8
+25°C
0.6
+125°C
0.4
0.2
0
0 50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
Figure 2. Dropout Voltage vs. Output Current over
Temperature
1.2 Iout = 500 mA
1.1
1.0 Iout = 350 mA
0.9
0.8
Iout = 100 mA
0.7
0.6 Iout = 10 mA
0.5
−40 −20
0 20 40 60 80 100 120
TEMPERATURE (°C)
Figure 3. Dropout Voltage vs. Temperature
1000
Unstable Region
100
125°C
25°C
−40°C
1000
Unstable Region
100
10 mF
0.1 mF
10
1
0.1
0.01
0
Stable Region
Cvout = 1 mF to 10 mF
10 20 30 40 50 60 70
OUTPUT CURRENT (mA)
Figure 4. Output Stability
10
Stable Region
1
T = 25°C
0.1
NOTE: At 125°C an additional area of instability occurs
(0.1 mF only) for loads less than 5 mA and low ESR.
0.01
0 10 20 30 40 50 60 70
OUTPUT CURRENT (mA)
Figure 5. Output Stability with Capacitor Change
55
Cdelay = 0.1 mF
54
53
52
51
50
49
48
47
−40 −20 0
20 40 60 80 100 120 140 160
TEMPERATURE (°C)
Figure 6. Delay Time
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5
5 Page 
NCV8141
Battery
Ignition
C1*
0.1 mF
(optional)
0.1 mF
VIN VOUT
NCV8141
ENABLE
RESET
DELAY
GND
WDI
C2*
10 mF*
2.7 kW
R***
VCC
RESET
WATCHDOG
PORT
Microprocessor
*C1 is required if regulator is located far from the power source filter.
**C2 is required for stability.
***R ≤ 80 kW.
Figure 14. Application Diagram
STABILITY CONSIDERATIONS
The output or compensation capacitor C2 in Figure 14
helps determine three main characteristics of a linear
regulator: startup delay, load transient response and loop
stability.
The capacitor value and type should be based on cost,
availability, size and temperature constraints. An aluminum
electrolytic capacitor is the least expensive solution, but, if
the circuit operates at low temperatures (−25°C to −40°C),
both the value and ESR of the capacitor will vary
considerably. The capacitor manufacturers data sheet
usually provides this information.
The value for the output capacitor C2 shown in Figure 14
should work for most applications, however it is not
necessarily the optimized solution.
To determine an acceptable value for C2 for a particular
application, start with a tantalum capacitor of the
recommended value and work towards a less expensive
alternative part.
Step 1: Place the completed circuit with a tantalum
capacitor of the recommended value in an environmental
chamber at the lowest specified operating temperature and
monitor the outputs with an oscilloscope. A decade box
connected in series with the capacitor will simulate the
higher ESR of an aluminum capacitor. Leave the decade box
outside the chamber, the small resistance added by the
longer leads is negligible.
Step 2: With the input voltage at its maximum value,
increase the load current slowly from zero to full load while
observing the output for any oscillations. If no oscillations
are observed, the capacitor is large enough to ensure a stable
design under steady state conditions.
Step 3: Increase the ESR of the capacitor from zero using
the decade box and vary the load current until oscillations
appear. Record the values of load current and ESR that cause
the greatest oscillation. This represents the worst case load
conditions for the regulator at low temperature.
Step 4: Maintain the worst case load conditions set in
Step 3 and vary the input voltage until the oscillations
increase. This point represents the worst case input voltage
conditions.
Step 5: If the capacitor is adequate, repeat Steps 3 and 4
with the next smaller valued capacitor. A smaller capacitor
will usually cost less and occupy less board space. If the
output oscillates within the range of expected operating
conditions, repeat Steps 3 and 4 with the next larger standard
capacitor value.
Step 6: Test the load transient response by switching in
various loads at several frequencies to simulate its real
working environment. Vary the ESR to reduce ringing.
Step 7: Increase the temperature to the highest specified
operating temperature. Vary the load current as instructed in
Step 5 to test for any oscillations.
Once the minimum capacitor value with the maximum
ESR is found, a safety factor should be added to allow for the
tolerance of the capacitor and any variations in regulator
performance. Most good quality aluminum electrolytic
capacitors have a tolerance of ± 20% so the minimum value
found should be increased by at least 50% to allow for this
tolerance plus the variation which will occur at low
temperatures. The ESR of the capacitor should be less than
50% of the maximum allowable ESR found in Step 3 above.
CALCULATING POWER DISSIPATION IN A SINGLE
OUTPUT LINEAR REGULATOR
The maximum power dissipation for a single output
regulator (Figure 15) is:
PD(max) + NJVIN(max) * VOUT(min)NjIOUT(max) ) VIN(max)IQ (1)
where:
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current for the
application, and
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| PDF Descargar | [ Datasheet NCV8141.PDF ] | |
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