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PDF NCP1581 Data sheet ( Hoja de datos )
| Número de pieza | NCP1581 | |
| Descripción | High Frequency Synchronous Step Down PWM Controller | |
| Fabricantes | ON Semiconductor | |
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NCP1581
www.DataSheet4U.com
High Frequency Synchronous
Step Down PWM Controller
for Tracking Applications
The NCP1581 controller IC is designed to provide a simple
synchronous buck regulator for on−board DC to DC applications in a
14−pin SOIC. The NCP1581 is designed specifically for tracking
applications by providing the track input.
The NCP1581 operates at a fixed internal 400 kHz switching
frequency allowing the use of small external components. The device
features a programmable soft start set by an external capacitor,
under−voltage lockout and output under−voltage detection that latches
off the device when an output short is detected.
Features
• Power up Sequencing / Tracking
• Enable Input
• Internal 400 kHz Oscillator
• Programmable Soft−Start
• Fixed Frequency Voltage Mode
• Voltage Mode Adaptive Deadtime
• This is a Pb−Free Device
Applications
• Tracking Applications
• Game Consoles
• Computing Peripheral Voltage Regulators
• Graphics Cards
• General DC to DC Converters
http://onsemi.com
MARKING
SOIC−14
DIAGRAM
14 D SUFFIX
1 CASE 751A
NCP1581G
A = Assembly Location
AWLYWW
WL = Wafer Lot
Y = Year
1
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
1
FB
NC
VP SS
NC COMP
VCC
NC
NC VC
LDRV
HDRV
GND
PGND
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
NCP1581
Figure 1. Typical Application Circuit
© Semiconductor Components Industries, LLC, 2010
January, 2010 − Rev. 0
1
Publication Order Number:
NCP1581/D
1 page  
NCP1581
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Table 5. ELECTRICAL SPECIFICATIONS Unless otherwise specified, VCC = VC = 12 V, 0°C < TJ < 125°C
Parameter
Symbol
Test Condition
Min Typ Max Units
SOFT START
Soft Start Current
Soft Start Turn On
ISS
SS (on)
VSS = 0 V
12 22 32
1.8 2 2.2
mA
V
OUTPUT DRIVERS
LO Drive Rise Time
HI Drive Rise Time
LO Drive Fall Time
HI Drive Fall Time
Dead Band Time
Adaptive DBT Level
tr(Lo)
tr(Hi)
tf(Lo)
tf(Hi)
tDEAD
VADT
CL = 1.5 nF (See Figure 3)
CL = 1.5 nF (See Figure 3)
CL = 1.5 nF (See Figure 3)
CL = 1.5 nF (See Figure 3)
(See Figure 3)
20 50
30 60
20 50
30 60
35 45 90
2.0
ns
ns
ns
ns
ns
V
tr(Hi)
9V
tf(Hi)
High Side Driver
(HDRV)
2V
tDEAD
tDEAD
tr(Lo)
tf(Lo)
9V
Low Side Driver
(LDRV)
2V
Figure 3. Definition of Rise/Fall Time and Deadband Time
7.00
6.90
6.80
6.70
6.60
6.50
6.40
6.30
6.20
6.10
6.00
0
TYPICAL CHARACTERISTICS
Rising
Falling
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 4. VCC UVLO
http://onsemi.com
5
5 Page 
Vout
VSS
VLDRV
VHDRV
NCP1581
2V
1V
3V
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Figure 13. Start-up to Pre-biased Output
Short Circuit Protection
The output of convertor with NCP1581 is protected
against short circuit conditions. This protection is sensing
output voltage through feedback divider on FB pin. On this
pin is comparator that compares FB voltage to 0.4 V. If FB
voltage is below 0.4 V then IC goes to latch state and switch
output drivers to off state. Latch state can be released by
decrease VCC or VP/EN voltage below threshold.
VCC or
VP/EN
Threshold
Vout
Output
shorted
VSS
VLDRV
VHDRV
Figure 14. Short Circuit Protection (Start Up,
Short, Latch, Latch Release and New Start-up)
http://onsemi.com
11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NCP1581.PDF ] | |
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