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PDF NCP1580 Data sheet ( Hoja de datos )
| Número de pieza | NCP1580 | |
| Descripción | Low Voltage Synchronous Buck Controller | |
| Fabricantes | ON Semiconductor | |
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NCP1580
Low Voltage Synchronous
Buck Controller
The NCP1580 is a voltage mode PWM controller designed to
operate from a 5.0 V or 12 V supply and produce an output voltage as
low as 0.8 V. This 8−pin device provides an optimal level of
integration to reduce size and cost of the power supply. The NCP1580
has a fixed 350 kHz oscillator and soft−start function. The NCP1580
provides a 1.5 A floating gate driver design to drive N−Channel
MOSFETs in a synchronous configuration. Adaptive non−overlap
circuitry reduces switching losses by preventing simultaneous
conduction of both outputs. Protection features include thermal
shutdown and undervoltage lockout (UVLO). The NCP1580 is
available in an 8−pin SOIC package.
Features
• Input Voltage Range from 4.5 V to 13.2 V
• 350 kHz Internal Oscillator
• Boost Pin Operates to 26.5 V
• Voltage Mode PWM Control
• 0.8 V $1.5% Internal Reference Voltage
• Adjustable Output Voltage
• Internal Soft−Start
• Internal 1.5 A Gate Drivers
• Adaptive Non−Overlap Circuit
• 90% Max Duty Cycle
• Input UVLO
• Overtemperature Protection
• Fully Specified over −40°C to 85°C
• Pb−Free Package is Available
Applications
• Graphics Cards
• Desktop Computers
• Servers/Networking
• DSP and FPGA Power Supply
• DC−DC Regulator Modules
VIN
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8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAM
8
1580
ALYW
1
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
PIN CONNECTIONS
BST 1
TG 2
GND 3
BG 4
8 PHASE
7 COMP
6 FB
5 VCC
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NCP1580DR2
SOIC−8 2500/Tape & Reel
NCP1580DR2G SOIC−8 2500/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.
VOUT
VCC
BST
TG FB
SWN
COMP
BG GND
Figure 1. Typical Application Diagram
© Semiconductor Components Industries, LLC, 2005
January, 2005 − Rev. 4
1
Publication Order Number:
NCP1580/D
1 page  
NCP1580
TYPICAL CHARACTERISTIC CURVES
816
812
808
804
800
796
792
788
784
−50
−25 0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
150
Figure 4. Reference Voltage (VREF) vs.
Temperature
2.20
2.15
2.10
2.05
2.00
VCC = 5.0 V
1.95
1.90
VCC = 12 V
1.85
1.80
−50
−25 0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
150
Figure 6. Soft−Start Time (tSS) vs. Temperature
410
400
390
380
370
360
350
340
330
320
310
300
290
−50
VCC = 5.0 V
VCC = 12 V
−25 0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 5. Oscillator Frequency (fSW) vs.
Temperature
150
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
−50
VCC = 12 V
VCC = 5.0 V
−25 0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
150
Figure 7. Quiescent Current (ICC) vs. Temperature
(No Switching)
6.0
5.5 VCC = 12 V
5.0
4.5 VCC = 8.0 V
4.0
3.5
3.0 VCC = 5.0 V
2.5
−50
−25 0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
150
Figure 8. Quiescent Current (ICC) vs. Temperature
(Switching)
100
80
60
40
20
0
−20
−40
−60
1.E+02
1.E+03
1.E+04 1.E+05
FREQUENCY (Hz)
1.E+06 1.E+07
Figure 9. Error Amplifier
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5
5 Page 
NCP1580
Layout Considerations
As in any high frequency switching converter, layout is
very important. Switching current from one power device to
another can generate voltage transients across the
impedances of the interconnecting bond wires and circuit
traces. These interconnecting impedances should be
minimized by using wide, short printed circuit traces. The
critical components should be located as close together as
possible using ground plane construction or single point
grounding. Figure 17 shows the critical power components
of the converter. To minimize the voltage overshoot the
interconnecting wires indicated by heavy lines should be
part of ground or power plane in a printed circuit board. The
components shown in Figure 17 should be located as close
together as possible. Please note that the capacitors CIN and
COUT each represent numerous physical capacitors. It is
desirable to locate the NCP1580 within 1 inch of the
MOSFETs, Q1 and Q2. The circuit traces for the MOSFETs’
gate and source connections from the NCP1580 must be
sized to handle up to 2.0 A peak current.
TG
PHASE
NCP1580
BG
GND
VIN
Q1
LOUT
VOUT
Q2
CIN
D2
COUT
RETURN
Figure 17.
R1
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11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet NCP1580.PDF ] | |
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