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PDF NCP1593A Data sheet ( Hoja de datos )
| Número de pieza | NCP1593A | |
| Descripción | Synchronous Buck Regulator | |
| Fabricantes | ON Semiconductor | |
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NCP1593A, NCP1593B
1 MHz, 3 A Synchronous
Buck Regulator
The NCP1593 is a fixed 1 MHz, high−output−current, synchronous
PWM converter that integrates a low−resistance, high−side P−channel
MOSFET and a low−side N−channel MOSFET. The NCP1593 utilizes
internally compensated current mode control to provide good transient
response, ease of implementation and excellent loop stability. It
regulates input voltages from 4.0 V to 5.5 V down to an output voltage
as low as 0.6 V and is able to supply up to 3 A of load current.
The NCP1593 includes an internally fixed switching frequency
(FSW), and an internal soft−start to limit inrush current. Other features
include cycle−by−cycle current limiting, 100% duty cycle operation,
short− circuit protection, power saving mode and thermal shutdown.
Features
• Wide Input Voltage Range: from 4.0 V to 5.5 V
• Internal 90 mW High−Side P−Channel MOSFET and 60 mW
Low−Side N−Channel MOSFET
• Fixed 1 MHz Switching Frequency
• Cycle−by−Cycle Current Limiting
• Hiccup Mode Short−Circuit Protection
• Overtemperature Protection
• Internal Soft−Start
• Start−up with Pre−Biased Output Load
• Adjustable Output Voltage Down to 0.6 V
• Diode Emulation During Light Load
• 100% Duty Cycle Operation to Extend the Battery Life
• These are Pb−Free Devices
Applications
• Set−Top Boxes
• DVD Drives and HDD
• LCD Monitors and TVs
• Cable Modems
• USB Modems
• Telecom/Networking/Datacom Equipment
http://onsemi.com
DFN10
CASE 485C
MARKING
DIAGRAMS
1593A
ALYWG
G
1593B
ALYWG
G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
NC 1
LX 2
LX 3
PG 4
EN 5
GND
10 VCCP
9 VCCP
8 VCCA
7 SS
6 FB
NCP1593A
(Top View)
LX 1
LX 2
LX 3
PG 4
EN 5
GND
10 VCCP
9 VCCP
8 VCCA
7 NC
6 FB
NCP1593B
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NCP1593AMNTWG DFN10 3000 / Tape &
(Pb−Free)
Reel
NCP1593BMNTWG DFN10
3000 / Tape &
(Pb−Free)
Reel
†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, 2012
July, 2012 − Rev. 2
1
Publication Order Number:
NCP1593/D
Free Datasheet http://www.datasheet4u.com/
1 page  
NCP1593A, NCP1593B
TYPICAL CHARACTERISTICS
100 100
95
VIN = 4.5 V
90
85 VIN = 5.0 V
95
VIN = 4.0 V
90
85 VIN = 5.0 V
80 80
75
70
0.01 0.1 1 10
IOUT, OUTPUT CURRENT (A)
Figure 3. Efficiency vs. Output Current (3.3 V)
75
70
0.01 0.1 1 10
IOUT, OUTPUT CURRENT (A)
Figure 4. Efficiency vs. Output Current (1.8 V)
100
95
90
VIN = 4.0 V
85
80 VIN = 5.0 V
75
70
65
0.01 0.1 1 10
IOUT, OUTPUT CURRENT (A)
Figure 5. Efficiency vs. Output Current (1.05 V)
3.40
3.38
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
0
VIN = 5.0 V
VIN = 4.5 V
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
IOUT, OUTPUT CURRENT (A)
Figure 6. Load Regulation (3.3 V)
1.90
1.88
1.86
1.84
1.82
1.80
1.78
1.76
1.74
1.72
1.70
0
VIN = 5.0 V
VIN = 4.5 V
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
IOUT, OUTPUT CURRENT (A)
Figure 7. Load Regulation (1.8 V)
1.15
1.13
1.11
1.09
1.07
1.05
1.03
1.01
0.99
0.97
0.95
0
VIN = 5.0 V
VIN = 4.5 V
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
IOUT, OUTPUT CURRENT (A)
Figure 8. Load Regulation (1.05 V)
http://onsemi.com
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
NCP1593A, NCP1593B
APPLICATION INFORMATION
Programming the Output Voltage
The output voltage is set using a resistive voltage divider
from the output voltage to FB pin (see Figure 27). So the
output voltage is calculated according to Eq.1.
Vout
+
VFB
@
R1 ) R2
R2
(eq. 2)
Vout
COUT(min)
+
8
@
Iripple
f @ Vripple
(eq. 4)
Where Vripple is the allowed output voltage ripple.
The required ESR for this amount of ripple can be
calculated by equation 5.
ESR
+
Vripple
Iripple
(eq. 5)
R1
FB
R2
Based on Equation 3 to choose capacitor and check its
ESR according to Equation 4. If ESR exceeds the value from
Eq.4, multiple capacitors should be used in parallel.
Ceramic capacitor can be used in most of the applications.
In addition, both surface mount tantalum and through−hole
aluminum electrolytic capacitors can be used as well.
Input Capacitor Selection
The input capacitor can be calculated by Equation 6.
Figure 27. Output divider
Cin(min)
+
Iout(max)
@
Dmax
@
f
@
1
Vin(ripple)
(eq. 6)
Inductor Selection
The inductor is the key component in the switching
regulator. The selection of inductor involves trade−offs
among size, cost and efficiency. The inductor value is
selected according to the equation 2.
ǒ ǓL
+
f
Vout
@ Iripple
@
1
*
Vout
Vin(max)
(eq. 3)
Where Vout − the output voltage;
f − switching frequency, 1.0 MHz;
Iripple − Ripple current, usually it’s 20% − 30% of output
current;
Vin(max) − maximum input voltage.
Choose a standard value close to the calculated value to
maintain a maximum ripple current within 30% of the
maximum load current. If the ripple current exceeds this
30% limit, the next larger value should be selected.
The inductor’s RMS current rating must be greater than
the maximum load current and its saturation current should
be about 30% higher. For robust operation in fault conditions
(start−up or short circuit), the saturation current should be
high enough. To keep the efficiency high, the series
resistance (DCR) should be less than 0.1 W, and the core
material should be intended for high frequency applications.
Output Capacitor Selection
The output capacitor acts to smooth the dc output voltage
and also provides energy storage. So the major parameter
necessary to define the output capacitor is the maximum
allowed output voltage ripple of the converter. This ripple is
related to capacitance and the ESR. The minimum
capacitance required for a certain output ripple can be
calculated by Equation 4.
Where Vin(ripple) is the required input ripple voltage.
Dmax
+
Vout
Vin(min)
is
the
maximum
duty
cycle.
(eq. 7)
Power Dissipation
The NCP1593 is available in a thermally enhanced
10−pin, DFN package. When the die temperature reaches
+185°C, the NCP1593 shuts down (see the
Thermal−Overload Protection section). The power
dissipated in the device is the sum of the power dissipated
from supply current (PQ), power dissipated due to switching
the internal power MOSFET (PSW), and the power
dissipated due to the RMS current through the internal
power MOSFET (PON). The total power dissipated in the
package must be limited so the junction temperature does
not exceed its absolute maximum rating of +150°C at
maximum ambient temperature. Calculate the power lost in
the NCP1593 using the following equations:
1. High side MOSFET
The conduction loss in the top switch is:
PHSON + I 2 RMS_HSFET RDS(on)HS
(eq. 8)
Where:
Ǹǒ ǓIRMS_FET +
Iout
2
)
DIPP
12
2
D (eq. 9)
DIPP is the peak−to−peak inductor current ripple.
The power lost due to switching the internal power high side
MOSFET is:
http://onsemi.com
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet NCP1593A.PDF ] | |
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