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PDF NCP1231 Data sheet ( Hoja de datos )
| Número de pieza | NCP1231 | |
| Descripción | Low Standby Power High Performance PWM Controller | |
| Fabricantes | ON Semiconductor | |
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NCP1231
Low−Standby Power High
Performance PWM
Controller
The NCP1231 represents a major leap towards achieving low
standby power in medium−to−high power Switched−Mode Power
Supplies such as notebook adapters, off−line battery chargers and
consumer electronics equipment. Housed in SOIC−8 or PDIP−8, the
NCP1231 contains all needed control functionality to build a rugged
and efficient power supply. Among the unique features offered by the
NCP1231 is an event management scheme that can disable the
front−end PFC circuit during standby, thus reducing the no load power
consumption. The NCP1231 itself goes into cycle skipping at light
loads while limiting peak current (to 25% of nominal peak) so that no
acoustic noise is generated and while in the skip cycle mode.
The NCP1231 also features an internal latching function that can be
used for Overvoltage Protection (OVP). The latch is triggered when
the voltage on Pin 8 rises above 4.0 V. During an OVP condition, the
output drive pulses are immediately stopped and the NCP1231 stays in
the latched off condition until VCC drops below 4.0 V (VCCreset). In
addition, Pin 8 also serves as a Brown−Out input which provides the
necessary safety feature when the SMPS faces low mains situations.
Features
• Current−Mode Operation with Internal Ramp Compensation
• Extremely Low Startup Current of 30 mA Typical
• Skip−Cycle Capability at Low Peak Currents
• Adjustable Soft−Start
• Overvoltage and Brown−Out Protection
• Short−Circuit Protection Independent of Auxiliary Level
• Internal Frequency Dithering for Improved EMI Signature
• Go−To−Standby Signal for PFC Front Stage
• Extremely Low No−Load, Noiseless, Standby Power
• Internal Leading Edge Blanking
• +500 mA/−800 mA Peak Current Drive Capability
• Available in Three Frequency Options: 65 kHz, 100 kHz, and 133 kHz
• Direct Optocoupler Connection
• SPICE Models Available for TRANsient and AC Analysis
• Pb−Free Packages are Available
http://onsemi.com
MARKING
DIAGRAMS
8
SOIC−8
D SUFFIX
1 CASE 751
231Dx
y
ALYW
G
1
PDIP−8
P SUFFIX
CASE 626
8
1231Pzz
AWL
YYWWG
11
231Dxy
1231Pzz
A
L, WL
Y, YY
W, WW
G or G
= Device Code
x = 1 or 6
y = 0 or 3
= Device Code
zz = 65, 100 or 133
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
1
PFC_VCC
FB
CS
GND
8
BO/OVP
SS
VCC
DRV
Typical Applications
• High Power AC−DC Adapters for Notebooks, etc.
• Offline Battery Chargers
• Set−Top Boxes Power Supplies, TV, Monitors, etc.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 19 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 4
1
Publication Order Number:
NCP1231/D
1 page  
NCP1231
ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, Max TJ = 150°C,
VCC = 13 V, unless otherwise noted.)
Rating
Symbol Pin Min Typ Max Unit
Supply Section (All frequency versions, otherwise noted)
Turn−On Threshold Level, VCC going up (Vfb = 2.0 V)
Minimum Operating Voltage after Turn−On
VCC Level at which the Internal Logic gets Reset (Note 4)
Startup Current (VCCON −0.2 V)
Internal IC Consumption, No Output Load on Pin 6 (Vfb = 2.5 V)
Internal IC Consumption, 1.0 nF Output Load on Pin 5, FSW = 65 kHz
Internal IC Consumption, 1.0 nF Output Load on Pin 5, FSW = 100 kHz
Internal IC Consumption, 1.0 nF Output Load on Pin 5, FSW = 133 kHz
Internal IC Consumption, Latch−Off Phase
Drive Output
VCCON
VCC(min)
VCCreset
Istartup
ICC1
ICC2
ICC2
ICC2
ICC3
6 11.3 12.6 13.8 V
6 7.0 7.7 8.4 V
6 − 4.0 − V
6−
30 50 mA
6 0.75 1.3
2.0 mA
6 1.4 2.0 2.6 mA
6 1.4 2.4 3.1 mA
6 1.4 2.9 3.7 mA
6 300 500 800 mA
Output Voltage Rise−Time @ CL = 1.0 nF, 10−90% of Output Signal (Note 4)
Output Voltage Fall−Time @ CL = 1.0 nF, 10−90% of Output Signal (Note 4)
Source Resistance (RLoad = 300 W, Vfb = 2.5 V)
Sink Resistance, at 1.0 V on Pin 5 (Vfb = 3.5 V)
Pin1 Output Impedance (or Rdson between Pin 1 and Pin 6 when SW1 is closed)
Rload on Pin 1= 680 W
Tr
Tf
ROH
ROL
RPFC
5 − 40 − ns
5 − 15 − ns
5 6.0 12.3 25
W
5 3.0 7.5 18 W
1 6.0 11.7 23
W
Current Comparator (Pin 5 unloaded)
Input Bias Current @ 1.0 V Input Level on Pin 3
Maximum Internal Current Set Point
TJ = +25°C
TJ = −40°C to +125°C
IIB
ILimit
3 − 0.02 − mA
3 0.95 1.00 1.05
0.93 − 1.07
V
Default Internal Set Point for Skip Cycle Operation and Standby Detection
Default Internal Set Point to Leave Standby
Propagation Delay from CS Detected to Gate Turned Off (Pin 5 Loaded by 1.0 nF)
Leading Edge Blanking Duration
Internal Oscillator
Vskip
3 600 750 900 mV
Vstby−out − 1.0 1.25 1.5
V
TDEL CS
3
−
90 200 ns
TLEB
3 100 250 350 ns
Oscillation Frequency, 65 kHz version (Vfb = 2.5 V)
Oscillation Frequency, 100 kHz version (Vfb = 2.5 V)
Oscillation Frequency, 133 kHz version (Vfb = 2.5 V)
Internal Modulation Swing, in Percentage of Fsw) (Typical) (Note 4)
fOSC
fOSC
fOSC
−
− 56 65 69 kHz
− 88 100 108 kHz
− 118 133 140 kHz
− − ±4.0 − %
Internal Swing Period with a 82 nF Capacitor to Pin 7) (Typical) (Note 4)
− − − 5.0 − ms
Maximum Duty−Cycle
Typical Soft−Start Period with a 82 nF to Pin 7 (Note 4)
Dmax
SS
− 75 80 85 %
7 − 5.0 − ms
SS Charging/Discharging Current
− 7 35 60 75 mA
Timer Charging Current (Typical) (Note 4)
− 7 − 1.36 − mA
Timer Peak Voltage
− 7 3.5 4.0 4.5 V
Timer Valley Voltage
− 7 1.9 2.2 2.6 V
Feedback Section (VCC = 13 V)
Opto Current Source (Vfb = 0.75 V)
Pin 3 to Current Setpoint Division Ratio (Note 3)
− 2 190 235 270 mA
Iratio
− − 3.0 − −
http://onsemi.com
5
5 Page 
NCP1231
TYPICAL PERFORMANCE CHARACTERISTICS
4.30 550
4.25 525
4.20 500
4.15 475
4.10
−50 −25 0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
150
Figure 27. Vlatchoff Threshold vs. Temperature
450
−50
−25 0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
150
Figure 28. VBOhigh vs. Temperature
260
250
240
230
220
210
−50
−25 0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
150
Figure 29. VBOlow vs. Temperature
http://onsemi.com
11
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet NCP1231.PDF ] | |
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