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PDF NCP1239 Data sheet ( Hoja de datos )
| Número de pieza | NCP1239 | |
| Descripción | Fixed Frequency Current | |
| Fabricantes | ON Semiconductor | |
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NCP1239
Fixed Frequency
Current‐Mode Controller for
Flyback Converter
The NCP1239 is a fixed-frequency current-mode controller
featuring a high-voltage start-up current source to provide a quick and
lossless power-on sequence. This function greatly simplifies the
design of the auxiliary supply and the VCC capacitor by activating the
internal start-up current source to supply the controller during start-up,
transients, latch, stand-by etc.
With a supply range up to 35 V, the controller hosts a jittered 65 or
100-kHz switching circuitry operated in peak current mode control.
When the power on the secondary side starts to decrease, the controller
automatically folds back its switching frequency down to minimum
level of 26 kHz. As the power further goes down, the part enters skip
cycle while limiting the peak current that insures excellent efficiency
in light load condition.
NCP1239 features a timer-based fault detection circuitry that
ensures a quasi-flat overload detection, independent of the input
voltage.
Features
• Fixed-Frequency 65-kHz or 100-kHz Current-Mode Control
Operation
• Frequency Foldback Down to 26 kHz and Skip Mode to
Maximize Performance in Light Load Conditions
• Adjustable Over Power Protection (OPP) Circuit
• High-Voltage Current Source with Brown-Out (BO) Detection
• Internal Slope Compensation
• Internal Fixed 8-ms Soft-Start
• Frequency Jittering in Normal and Frequency Foldback Modes
• 64-ms Timer-Based Short-Circuit Protection with Auto-Recovery
or Latched Operation
• Pre-Short Ready for Latched OCP Versions
• Latched OVP on VCC (NCP1239 A, B, D or E Versions)
• Latched OVP/OTP Input for Improved Robustness
• 35-V VCC Operation
• ±500 mA Peak Source/Sink Drive Capability
• Internal Thermal Shutdown
• Extremely Low No-Load Standby Power
• Pin-to-Pin Compatible with the Existing NCP1236/1247 Series
• These Devices are Pb-Free and are RoHS Compliant
Typical Applications
• AC-DC Converters for TVs, Set-Top Boxes and Printers
• Offline Adapters for Notebooks and Netbooks
www.onsemi.com
SOIC−7
CASE 751U
PIN CONNECTIONS
Fault 1
FB 2
CS 3
GND 4
8 HV
6 VCC
5 DRV
MARKING DIAGRAM
8
1239xfff
ALYWX
G
1
1239xfff
A
L
Y
W
G
= Specific Device Code
x = A, B, C, D or E
fff = 065 or 100
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information on page 24 of
this data sheet.
© Semiconductor Components Industries, LLC, 2015
November, 2015 − Rev. 9
1
Publication Order Number
NCP1239/D
1 page  
NCP1239
Table 4. ELECTRICAL CHARACTERISTICS (continued)
(For typical values TJ = 25°C, for min/max Values TJ = −40°C to +125°C, VHV = 125 V, VCC = 11 V unless otherwise noted)
Parameter
Test Conditions
Symbol
Min Typ Max
Unit
SUPPLY SECTION
Internal IC Consumption
Internal IC Consumption in Skip Cycle
VFB = 3.2 V, FSW = 100 kHz
and CL = 1 nF
VCC = 12 V, VFB = 0.775 V
Driving 8 A/650 V MOSFET
ICC2
ICC(stb)
− 3.1 4.0 mA
− 500 −
mA
Internal IC Consumption in Fault Mode
Fault or Latch
ICC3
− 400 −
mA
Internal IC Consumption before Start-Up
Internal IC Consumption before Start-Up
DRIVE OUTPUT
VCC(min) < VCC < VCC(on)
VCC < VCC(min)
ICC4
ICC5
− 310 −
− 20 −
mA
mA
Rise Time (10−90%)
Fall Time (90−10%)
Source Resistance
Sink Resistance
Peak Source Current
Peak Sink Current
High State Voltage
(Low VCC Level)
High State Voltage
(High VCC Level)
CURRENT COMPARATOR
VDRV from 10 to 90%
VCC = VCC(off) + 0.2 V,
CL = 1 nF
VDRV from 90 to 10%
VCC = VCC(off) + 0.2 V,
CL = 1 nF
DRV High State,
VDRV = 0 V (Note 1)
VCC = VCC(off) + 0.2 V,
CL = 1 nF
DRV Low State,
VDRV = VCC (Note 1)
VCC = VCC(off) + 0.2 V,
CL = 1 nF
VCC = 9 V, RDRV = 33 kW
DRV High State
VCC = VCC(OVP) – 0.2 V,
DRV High State and Unloaded
tR
tF
ROH
ROL
ISOURCE
ISINK
VDRV(low)
VDRV(clamp)
−
−
−
−
−
−
8.8
11.0
40 −
30 −
6−
6−
500 −
500 −
−−
13.5 16.0
ns
ns
W
W
mA
mA
V
V
Input Pull-Up Current
Maximum Internal Current Setpoint
VCS = 0.7 V
TJ from −40°C to +125°C
(No OPP)
IBIAS
VLIMIT1
−
0.752
1
0.800
−
0.848
mA
V
Abnormal Over-Current Fault Threshold
Default Internal Voltage Set Point for
Frequency Foldback Trip Point
TJ = +25 °C (No OPP)
~59% of VLIMIT
VLIMIT2
VFOLD(CS)
1.10 1.20 1.30
− 475 −
V
mV
Internal Peak Current Setpoint Freeze
Propagation Delay from VLIMIT Detection to
Gate Off-State
~31% of VLIMIT
DRV Output Unloaded
VFREEZE(CS)
tDEL
−
−
250 − mV
50 100 ns
Leading Edge Blanking Duration
Abnormal Over-Current Fault Blanking
Duration for VLIMIT3
Number of Clock Cycles before Fault
Confirmation
tLEB1
tLEB2
tCOUNT
− 300 −
− 120 −
−4−
ns
ns
Internal Soft-Start Duration
Activated upon Start-Up or
Auto-Recovery
tSS − 8 − ms
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
1. Guaranteed by design
2. CS pin source current is a sum of IBIAS and IOPP, thus at VHV = 125 V is observed the IBIAS only, because IOPC is switched off.
www.onsemi.com
5
5 Page 
NCP1239
TYPICAL PERFORMANCE CHARACTERISTICS
26 150
25
140
24
130
23
120
22
21
−40 −20
0
20 40 60 80 100 120
Temperature (5C)
Figure 21. REQ vs. Junction Temperature
110
−40 −20
0
20 40 60 80 100 120
Temperature (5C)
Figure 22. IOOP3 vs. Junction Temperature
120
116
112
108
104
100
−40 −20
0
20 40 60 80 100 120
Temperature (5C)
Figure 23. VBO(on) vs. Junction Temperature
109
105
101
97
93
−40 −20
0
20 40 60 80 100 120
Temperature (5C)
Figure 24. VBO(off) vs. Junction Temperature
82
78
74
70
66
62
58
54
−40 −20
0
20 40 60 80 100 120
Temperature (5C)
Figure 25. tBO vs. Junction Temperature
3.2
3.1
3.0
2.9
2.8
−40 −20
0
20 40 60 80 100 120
Temperature (5C)
Figure 26. VFAULT(OVP) vs. Junction Temperature
www.onsemi.com
11
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| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet NCP1239.PDF ] | |
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