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PDF NCP1583 Data sheet ( Hoja de datos )
| Número de pieza | NCP1583 | |
| Descripción | (NCP1582 / NCP1583) Low Voltage Synchronous Buck Controller | |
| Fabricantes | ON Semiconductor | |
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NCP1582, NCP1582A,
NCP1583
Low Voltage Synchronous
Buck Controllers
The NCP158x is a low cost PWM controller designed to operate from
a 5 V or 12 V supply. This device is capable of producing 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. Features include a
0.7 A gate driver and an internally set 350 kHz (NCP1582, NCP1582A)
and a 300 kHz (NCP1583) oscillator. The NCP158x also incorporates an
externally compensated transconductance error amplifier and a
programmable soft−start function. Protection features include short
circuit protection (SCP) and under voltage lockout (UVLO). The
NCP158x comes in an 8−pin SOIC package.
Features
• Input Voltage Range from 4.5 V to 13.2 V
• 350 kHz (NCP1582, NCP1582A), 300 kHz (NCP1583) Internal
Oscillator
• Boost Pin Operates to 30 V
• Voltage Mode PWM Control
• 0.8 V $1.5% Internal Reference Voltage
• Adjustable Output Voltage
• Programmable Soft−Start
• Internal 0.7 A Gate Drivers
• 80% Max Duty Cycle
• Input UVLO
• RDS(on) Current Sensing for Short Circuit Protection
• These are Pb−Free Devices
Applications
• Graphics Cards
• Desktop Computers
• Servers/Networking
• DSP and FPGA Power Supply
• DC−DC Regulator Modules
VCC
BST
FB
VIN
COMP/DIS
TG
PHASE
VOUT
GND
BG
8
1
http://onsemi.com
MARKING DIAGRAM
8
SOIC−8
D SUFFIX
CASE 751
158x
ALYW
G
1
x = 2, 2A or 3
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Device
PIN CONNECTIONS
BST 1
8 PHASE
TG 2
GND 3
BG 4
7 COMP/DIS
6 FB
5 VCC
(Top View)
NCP158x
Series
NCP1582
NCP1582A
NCP1583
Oscillator
Frequency
350 kHz
350 kHz
300 kHz
SCP Trip Voltage
−350 mV
−450 mV
−350 mV
ORDERING INFORMATION
Device
Package
Shipping†
NCP1582DR2G SOIC−8 2500/Tape & Reel
(Pb−Free)
NCP1582ADR2G SOIC−8 2500/Tape & Reel
(Pb−Free)
NCP1583DR2G 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.
Figure 1. Typical Application Diagram
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 2
1
Publication Order Number:
NCP1582/D
1 page  
NCP1582, NCP1582A, NCP1583
TYPICAL OPERATING CHARACTERISTICS
380
370
VCC = 5.0 V
360
350
VCC = 12 V
340
330
320
310
−50
−25 0 25 50 75 100
TJ, JUNCTION TEMPERATURE (°C)
Figure 4. Oscillator Frequency (FSW) vs.
Temperature
125
812
808
804
800
796
792
788
784
−50
−25 0
25 50 75 100
TJ, JUNCTION TEMPERATURE (°C)
125
Figure 6. Reference Voltage (Vref) vs. Temperature
4.3
4.2
4.1
4.0
3.9
3.8
3.7
−50
−25 0 25 50 75 100
TJ, JUNCTION TEMPERATURE (°C)
Figure 5. ICC vs. Temperature
125
4.4
4.3
RISING
4.2
4.1
4.0
3.9
3.8
3.7
3.6
−50
FALLING
−25 0 25 50 75 100
TJ, JUNCTION TEMPERATURE (°C)
125
Figure 7. UVLO vs. Temperature
12 500
450
11
400
10
350
9.0
−50
−25 0 25 50 75 100
TJ, JUNCTION TEMPERATURE (°C)
125
Figure 8. Soft Start Sourcing Current vs.
Temperature
300
−50
−25 0 25 50 75 100
TJ, JUNCTION TEMPERATURE (°C)
125
Figure 9. I−Limit vs. Temperature
http://onsemi.com
5
5 Page 
NCP1582, NCP1582A, NCP1583
Design Example
Switching Frequency FSW = 350 KHZ
Output Capacitance CESR = 45 mW/Each
Output Capacitance Cout = 6630 mF
Output Inductance Lout = 0.75 mH
Input Voltage Vin = 12 V
Output Voltage Vout = 3.3 V
Choose the loop gain crossover frequency;
FCO
+
1
10
*
FSW
+
35
kHz
The corner frequency of the output filter is calculated
below;
FLC
+
2
*
p
*
1
Ǹ0.75 mH
*
6630
mF
+
2.3
kHz
Let RC = 1500
Check that the ESR zero frequency is not too high;
FESR
+
2
*
p
@
1
CESR
@
CO
t
FSW
5
This condition is mandatory for loop stability.
Zero of the compensation network is calculated as
follows;
FZ + FLC
CC
+
2
*
p
*
1
FZ
*
RC
+
2
*
p
*
2.3
1
kHz
*
1500
+
46
nF
The compensation capacitor also acts as the soft start
capacitor. By adjusting the value of this compensation
capacitor, the soft start time can be adjusted.
Pole of the compensation network is calculated as
follows;
FP + 5 * FCO + 175 kHz
CP
+
2
*
p
*
1
FP
*
RC
+
2
*
p
*
1
175 kHz
*
1500
+
700
pF
The recommended compensation values are;
RC = 1500, CC = 46 nF, CP = 700 pF
The NCP158x bode plot as measured from the network
analyzer is shown below.
Top plot: Phase−Frequency (Phase Margin = 62.519°)
Bottom plot: Gain−Frequency (UGBW= 5 MHz)
Figure 15. Typical Bode plot of the Open−loop
Frequency Response of the NCP158x
http://onsemi.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet NCP1583.PDF ] | |
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