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PDF NCP1251 Data sheet ( Hoja de datos )
| Número de pieza | NCP1251 | |
| Descripción | Current-Mode PWM Controller | |
| Fabricantes | ON Semiconductor | |
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NCP1251
Current-Mode PWM
Controller for Off-line
Power Supplies
The NCP1251 is a highly integrated PWM controller capable of
delivering a rugged and high performance offline power supply in a
tiny TSOP−6 package. With a supply range up to 28 V, the controller
hosts a jittered 65 kHz 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 a minimum level of 26 kHz. As the power further
goes down, the part enters skip cycle while limiting the peak current.
Over Power Protection (OPP) is a difficult exercise especially when
no−load standby requirements drive the converter specifications. The
ON proprietary integrated OPP lets you harness the maximum
delivered power without affecting your standby performance simply
via two external resistors. A latched Over Voltage Protection (OVP) is
combined on the same pin. For ease of implementation, a latched OVP
also monitors the VCC line. They offer an efficient protection in case
of optocoupler destruction or adverse open loop operation.
Finally, a timer−based short−circuit protection offers the best
protection scheme, letting you precisely select the protection trip point
irrespective of a loose coupling between the auxiliary and the power
windings.
Features
• Fixed−Frequency 65 or 100 kHz Current−Mode Control Operation
• Internal and Adjustable Over Power Protection (OPP) Circuit
• Frequency Foldback Down to 26 kHz and Skip−Cycle in Light Load
Conditions
• Internal Ramp Compensation
• Internal Fixed 4 ms Soft−Start
• 100 ms Timer−Based Auto−Recovery Short−Circuit Protection
• Frequency Jittering in Normal and Frequency Foldback Modes
• Option for Auto−Recovery or Latched Short−Circuit Protection
• OVP Input for Improved Robustness
• Up to 28 V VCC Operation
• Latched OVP Protection on VCC
• +300 mA / −500 mA Source/Sink Drive Capability
• Less than 100 mW Standby Power at High Line
• EPS 2.0 Compliant
• These are Pb−Free Devices
Typical Applications
• ac−dc Converters for TVs, Set−top Boxes and Printers
• Offline Adapters for Notebooks and Netbooks
http://onsemi.com
MARKING
DIAGRAM
TSOP−6
(SOT23−6)
5xyAYWG
SN SUFFIX
G
1
CASE 318G
1
STYLE 13
5xy = Specific Device Code
x = A or U
y = A, 2, C, or D
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
GND 1
6 DRV
FB 2
OPP/Latch 3
5 VCC
4 CS
(Top View)
ORDERING INFORMATION
See detailed ordering, marking and shipping information in the
package dimensions section on page 2 of this data sheet.
© Semiconductor Components Industries, LLC, 2014
December, 2014 − Rev. 11
1
Publication Order Number:
NCP1251/D
1 page  
NCP1251
ELECTRICAL CHARACTERISTICS
(For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, Max TJ = 150°C, VCC = 12 V unless otherwise noted)
Symbol
Rating
Pin Min Typ Max
SUPPLY SECTION
VCCON
VCC(min)
VCCHYST
VZENER
ICC1
VCC increasing level at which driving pulses are authorized
VCC decreasing level at which driving pulses are stopped
Hysteresis VCCON − VCC(min)
Clamped VCC when latched off / burst mode activation @ ICC = 500 mA
Start−up current
5 16 18 20
5 8.2 8.8 9.4
5 6.0
5 7.0
5 15
ICC2
ICC3
ICC2
ICC3
ICCstby
Internal IC consumption with IFB = 50 mA, FSW = 65 kHz and CL = 0 nF
Internal IC consumption with IFB = 50 mA, FSW = 65 kHz and CL = 1 nF
Internal IC consumption with IFB = 50 mA, FSW = 100 kHz and CL = 0 nF
Internal IC consumption with IFB = 50 mA, FSW = 100 kHz and CL = 1 nF
Internal IC consumption while in skip cycle (VCC = 12 V, driving a typical 6 A/600 V
MOSFET)
5
5
5
5
5
1.4 2.2
2.1 3.0
1.7 2.5
3.1 4.0
550
ICCLATCH
Current flowing into VCC pin that keeps the controller latched (Note 4)
TJ = −40°C to +125°C
TJ = 0°C to +125°C
Rlim Current−limit resistor in series with the latch SCR
DRIVE OUTPUT
5
5
40
32
4.0
Tr Output voltage rise−time @ CL = 1 nF, 10−90% of output signal
Tf Output voltage fall−time @ CL = 1 nF, 10−90% of output signal
ROH
Source resistance
ROL Sink resistance
Isource Peak source current, VGS = 0 V – (Note 5)
Isink Peak sink current, VGS = 12 V – (Note 5)
VDRVlow DRV pin level at VCC close to VCC(min) with a 33 kW resistor to GND
VDRVhigh DRV pin level at VCC = 28 V – DRV unloaded
CURRENT COMPARATOR
6 40
6 30
6 13
6 6.0
6 300
6 500
6 8.0
6 10 12 14
IIB
VLimit1
VLimit2
Vfold
Vfreeze
TDEL
TLEB
TSS
Input Bias Current @ 0.8 V input level on pin 4
Maximum internal current setpoint – TJ = 25°C – pin 3 grounded
Maximum internal current setpoint – TJ = −40°C to 125°C – pin 3 grounded
Default internal voltage set point for frequency foldback trip point – 45% of Vlimit
Internal peak current setpoint freeze ([31% of Vlimit)
Propagation delay from current detection to gate off−state
Leading Edge Blanking Duration
Internal soft−start duration activated upon startup, auto−recovery
4 0.02
4 0.744 0.8 0.856
4 0.72 0.8 0.88
3 357
3 250
4 100 150
4 300
−4
IOPPo Setpoint decrease for pin 3 biased to –250 mV – (Note 6)
3 31.3
IOOPv
IOOPv
IOPPs
Voltage setpoint for pin 3 biased to −250 mV – (Note 6), TJ = 25°C
Voltage setpoint for pin 3 biased to −250 mV – (Note 6), TJ = −40°C to 125°C
Setpoint decrease for pin 3 grounded
3 0.51 0.55 0.60
3 0.50 0.55 0.62
30
4. For design robustness, we recommend to inject 60 mA as a minimum at the lowest input line voltage.
5. Guaranteed by design
6. See characterization table for linearity over negative bias voltage
7. A 1 MW resistor is connected from pin 3 to the ground for the measurement.
Unit
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
kW
ns
ns
W
W
mA
mA
V
V
mA
V
V
mV
mV
ns
ns
ms
%
V
V
%
http://onsemi.com
5
5 Page 
NCP1251
TYPICAL CHARACTERISTICS
100
80
60
40
20
0
−50 −25
0 25 50 75
TEMPERATURE (°C)
Figure 27.
100 125
14
13
12
11
10
9
8
7
−50 −25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 28.
12.9
12.4
11.9
11.4
10.9
10.4
9.9
9.4
8.9
−50 −25
0 25 50 75
TEMPERATURE (°C)
Figure 29.
100 125
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
−50 −25
0 25 50 75
TEMPERATURE (°C)
Figure 31.
100 125
4.9
4.4
3.9
3.4
2.9
−50 −25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 30.
360
358
356
354
352
350
−50 −25
0 25 50 75 100 125
TEMPERATURE (°C)
Figure 32.
http://onsemi.com
11
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| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet NCP1251.PDF ] | |
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