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PDF NCP3163 Data sheet ( Hoja de datos )
| Número de pieza | NCP3163 | |
| Descripción | Step-Up/Down/ Inverting 50-300 kHz Switching Regulator | |
| Fabricantes | On Semiconductor | |
| Logotipo |  |
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NCP3163, NCV3163
3.4 A, Step-Up/Down/
Inverting 50-300 kHz
Switching Regulator
The NCP3163 Series is a performance enhancement to the popular
MC33163 and MC34163 monolithic DC−DC converters. These
devices consist of an internal temperature compensated reference,
comparator, controlled duty cycle oscillator with an active current
limit circuit, driver and high current output switch. This controller was
specifically designed to be incorporated in step−down, step−up, or
voltage−inverting applications with a minimum number of external
components. The NCP3163 comes in an exposed pad package which
can greatly increase the power dissipation of the built in power switch.
Features
• Output Switch Current in Excess of 3.0 A
• 3.4 A Peak Switch Current
• Frequency is Adjustable from 50 kHz to 300 kHz
• Operation from 2.5 V to 40 V Input
• Externally Adjustable Operating Frequency
• Precision 2% Reference for Accurate Output Voltage Control
• Driver with Bootstrap Capability for Increased Efficiency
• Cycle−by−Cycle Current Limiting
• Internal Thermal Shutdown Protection
• Low Voltage Indicator Output for Direct Microprocessor Interface
• Exposed Pad Power Package
• Low Standby Current
• NCV Prefix for Automotive and Other Applications Requiring Site
and Change Control
• These are Pb−Free Devices
8
Vin + 7
Cin
6
Current
- Limit
+
VCC
Oscillator
5
Thermal
4
3
R
Q
S
VCC
9
10
11
12
13
14
2
+
+
-
15
1
+
+
-
LVI
16
VCC
(Bottom View)
Figure 1. Typical Buck Application Circuit
Vout
CO +
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16
1
SOIC−16W
EXPOSED PAD
PW SUFFIX
CASE 751AG
MARKING
DIAGRAMS
16
NCx3163yPW
AWLYYWWG
1
18 1
18
18−LEAD DFN NCx3163y
1 MN SUFFIX AWLYYWW G
CASE 505
G
NCx3163y
A
WL
YY
WW
G or G
= Specific Device Code
x = P or V
y = blank or B
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
*For additional information on our Pb−Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2010
April, 2010 − Rev. 7
1
Publication Order Number:
NCP3163/D
1 page  
NCP3163, NCV3163
300
VCC = 15 V
TA = 25°C
250
200
Rt = 15 kW
150
Rt = open
100
50
0 100 200 300 400 500 600 700
CT, TIMER CAPACITANCE (pF)
Figure 3. Oscillator Frequency vs. Timer
Capacitance (CT)
2.0
VCC = 15 V
CT = 620 pF
0
- 2.0
- 4.0
- 6.0
- 55
- 25 0 25 50 75
TA, AMBIENT TEMPERATURE (°C)
100 125
Figure 4. Oscillator Frequency Change vs.
Temperature when only CT is connected to Pin 6
4.0
VCC = 15 V
2.0 CT = 230 pF
RT = 20 kW
0
- 2.0
- 4.0
- 6.0
- 8.0
- 10
- 50
- 25 0
25 50 75
TEMPERATURE (°C)
100 125
Figure 5. Oscillator Frequency Change vs.
Temperature when CT and RT are connected to Pin 6
140
VCC = 15 V
VFB1 = 5.05 V
120
100
80
60
- 55 - 25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 6. Feedback Comparator 1 Input Bias
Current vs. Temperature
1300
1280 VCC = 15 V
Vth Max = 1275 mV
1260 Vth Typ = 1250 mV
1240
Vth Min = 1225 mV
1220
1200
- 55 - 25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 7. Feedback Comparator 2 Threshold
Voltage vs. Temperature
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5
5 Page 
NCP3163, NCV3163
Calculation
(See Notteosn 1,2,3)
toff
Step−Down
Vout ) VF
Vin * Vsat * Vout
ton
toff
ǒ Ǔton
ƒ
ton
toff
)
1
CT
32.143
·
f
10*6
*
20
@
10*12
IL(avg)
Iout
Ipk (Switch)
RSC
L
Vripple(pp)
Vout
IL(avg)
)
DIL
2
0.25
Ipk (Switch)
ǒ ǓVin * Vsat * Vout
DIL
ton
ǒ ǓDIL
1
8 ƒ CO
2
)
(ESR)2
ǒ ǓVref
R2
R1
)
1
Step−Up
Vout ) VF Vin
Vin Vsat
ton
toff
ǒ Ǔƒ
ton
toff
)
1
32.143
·
f
10*6
*
20
@
10*12
ǒ ǓIout
ton
toff
)
1
IL(avg)
)
DIL
2
0.25
Ipk (Switch)
ǒ ǓVin * Vsat
DIL
ton
[
ton Iout
CO
ǒ ǓVref
R2
R1
)
1
Voltage−Inverting
|Vout| ) VF
Vin * Vsat
ton
toff
ǒ Ǔƒ
ton
toff
)
1
32.143
·
f
10*6
*
20
@
10*12
ǒ ǓIout
ton
toff
)
1
IL(avg)
)
DIL
2
0.25
Ipk (Switch)
ǒ ǓVin * Vsat
DIL
ton
[
ton Iout
CO
ǒ ǓVref
R2
R1
)
1
The following Converter Characteristics must be chosen:
Vin − Nominal operating input voltage.
Vout − Desired output voltage.
Iout − Desired output current.
DIL − Desired peak−to−peak inductor ripple current. For maximum output current it is suggested that DIL be chosen to be less
than 10% of the average inductor current IL(avg). This will help prevent Ipk (Switch) from reaching the current limit
threshold set by RSC. If the design goal is to use a minimum inductance value, let DIL = 2(IL(avg)). This will
proportionally reduce converter output current capability.
p − Maximum output switch frequency.
Vripple(pp) − Desired peak−to−peak output ripple voltage. For best performance the ripple voltage should be kept to a low value
since it will directly affect line and load regulation. Capacitor CO should be a low equivalent series resistance (ESR)
electrolytic designed for switching regulator applications.
NOTES: 1. Vsat − Saturation voltage of the output switch, refer to Figures 10 and 11.
NOTES: 2. VF − Output rectifier forward voltage drop. Typical value for 1N5822 Schottky barrier rectifier is 0.5 V.
NOTES: 3. The calculated ton/toff must not exceed the minimum guaranteed oscillator charge to discharge ratio of 8, at the minimum
NOTES: 3. operating input voltage.
Figure 22. Design Equations
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11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet NCP3163.PDF ] | |
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