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PDF NCP1379 Data sheet ( Hoja de datos )

Número de pieza NCP1379
Descripción Quasi-Resonant Current-Mode Controller
Fabricantes ON Semiconductor 
Logotipo ON Semiconductor Logotipo



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NCP1379
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Quasi-Resonant
Current-Mode Controller for
High-Power Universal
Off-line Supplies
The NCP1379 hosts a highperformance circuitry aimed to
powering quasiresonant converters. Capitalizing on a proprietary
valleylockout system, the controller shifts gears and reduces the
switching frequency as the power loading becomes lighter. This
results in a stable operation despite switching events always occurring
in the drainsource valley. This system works down to the 4th valley
and toggles to a variable frequency mode beyond, ensuring an
excellent standby power performance.
The controller includes an Over Power Protection circuit which
clamps the delivered power at highline. Safetywise, a fixed internal
timer relies on the feedback voltage to detect a fault. Once the timer
elapses, the controller stops and enters autorecovery mode, ensuring
a low dutycycle burst operation. To further improve the safety of the
power supply, the NCP1379 features a pin to implement a combined
brownout/overvoltage protection.
Particularly well suited for TVs power supply applications, the
controller features a low startup voltage allowing the use of an
auxiliary power supply to power the device.
Features
QuasiResonant Peak CurrentMode Control Operation
Valley Switching Operation with ValleyLockout for NoiseImmune
Operation
Frequency Foldback at Light Load to Improve the Light Load
Efficiency
Adjustable Over Power Protection
AutoRecovery Output ShortCircuit Protection
Fixed Internal 80 ms Timer for ShortCircuit Protection
Combined Overvoltage Protection and Brownout
+500 mA / 800 mA Peak Current Source/Sink Capability
Internal Temperature Shutdown
Direct Optocoupler Connection
Low VCC(on) Allowing to Use a Standby Power Supply to Power the
Device
Extremely Low NoLoad Standby Power
SO8 Package
These Devices are PbFree and are RoHS Compliant
Typical Applications
High Power acdc Converters for TVs, SetTop Boxes etc.
Offline Adapters for Notebooks
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
http://onsemi.com
QUASIRESONANT PWM
CONTROLLER FOR HIGH
POWER ACDC WALL
ADAPTERS
8
1
SOIC8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
1379
ALYW
G
1
1379
A
L
Y
W
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= PbFree Package
PIN CONNECTIONS
ZCD 1
FB 2
CS 3
GND 4
8 CT
7 FAULT
6 VCC
5 DRV
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 21 of this data sheet.
© Semiconductor Components Industries, LLC, 2009
December, 2009 Rev. P0
1
Publication Order Number:
NCP1379/D

1 page




NCP1379 pdf
NCP1379
ELECTRICAL CHARACTERISTICS (Unless otherwise noted: For typical values TJ = 25°C, VCC = 12 V, VZCwDw=w0.DVa, VtaFSBh=e3etV4,U.com
VCS = 0 V, Vfault = 1.5 V, CT = 680 pF) For min/max values TJ = 40°C to +125°C, Max TJ = 150°C, VCC = 12 V)
Symbol
Parameter
Conditions
Min Typ Max Unit
CURRENT COMPARATOR CURRENT SENSE
VOPP(MAX) Setpoint decrease for VZCD = 300 mV (Note 5)
VCS(stop)
Threshold for immediate fault protection activation
tBCS
Leading Edge Blanking Duration for VCS(stop)
DRIVE OUTPUT GATE DRIVE
VZCD = 300 mV, VFB =
4 V, VCS increasing
35.0 37.5 40.0
1.125
1.200
120
1.275
%
V
ns
RSNK
RSRC
ISNK
ISRC
tr
Drive Resistance
DRV Sink
DRV Source
Drive current capability
DRV Sink
DRV Source
Rise Time (10 % to 90 %)
VDRV = 10 V
VDRV = 2 V
12.5
20
W
VDRV = 10 V
VDRV = 2 V
mA
800
500
CDRV = 1 nF, VDRV from 0
to 12 V
40 75 ns
tf Fall Time (90 % to 10 %)
CDRV = 1 nF, VDRV from 0
to 12 V
25 60 ns
VDRV(low)
DRV Low Voltage
VCC = VCC(off) + 0.2 V
CDRV = 1 nF, RDRV=33 kW
VDRV(high)
DRV High Voltage (Note 6)
VCCCDR=VV=CC1(MnFAX)
DEMAGNETIZATION INPUT ZERO VOLTAGE DETECTION CIRCUIT
8.4
10.5
9.1
13.0
15.5
V
V
VZCD(TH)
VZCD(HYS)
VCH
VCL
tDEM
ZCD threshold voltage
ZCD hysteresis
Input clamp voltage
High state
Low state
Propagation Delay
VZCD decreasing
VZCD increasing
Ipin1 = 3.0 mA
Ipin1 = 2.0 mA
VZCD
decreasing from
to 0.3 V
4
V
35
15
8
0.9
55
35
10
0.7
150
90
55
12
0.3
250
mV
mV
V
ns
CPAR
Internal input capacitance
tBLANK
Blanking delay after ontime
toutSS
tout
Timeout after last demag transition
RZCD(pdown) Pulldown resistor (Note 3)
TIMING CAPACITOR TIMING CAPACITOR
10 pF
2.30 3.15 4.00 ms
During softstart
28 41 54 ms
After the end of softstart
5.0
5.9
6.7
140 320 500 kW
VCT(MAX)
ICT
VCT(MIN)
Maximum voltage on CT pin
Source current
Minimum voltage on CT pin, discharge switch
activated
VFB < VFB(TH)
VCT = 0 V
5.15 5.40 5.65
V
18 20 22 mA
− − 90 mV
CT Recommended timing capacitor value
FEEDBACK SECTION FEEDBACK
220 pF
RFB(pullup)
Internal pullup resistor
15 18 22 kW
Iratio Pin FB to current setpoint division ratio
3.8 4.0 4.2
VFB(TH)
FB pin threshold under which CT is clamped to
VCT(MAX)
0.26 0.30 0.34
V
3. Guaranteed by design
4. The peak current setpoint goes down as the load decreases. It is frozen below Ipeak(VCO) (Ipeak = cst)
5. If negative voltage in excess to 300 mV is applied to ZCD pin, the current setpoint decrease is no longer guaranteed to be linear
6. Minimum value for TJ = 125°C
http://onsemi.com
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NCP1379 arduino
NCP1379
NCP1379 OPERATING MODES
www.DataSheet4U.com
NCP1379 has two operating mode: quasiresonant
operation and VCO operation for the frequency foldback.
The operating mode is fixed by the FB voltage as
portrayed by Figure 22:
Quasiresonant operation occurs for FB voltage higher
than 0.8 V (FB decreasing) or higher than 1.4 V (FB
increasing) which correspond to high output power and
medium output power. The peak current is variable and
is set by the FB voltage divided by 4.
Frequency foldback or VCO mode occurs for FB
voltage lower than 0.8 V (FB decreasing) or lower than
1.4 V (FB increasing). This corresponds to low output
power.
During VCO mode, the peak current decreases down to
17.5% of its maximum value and is then frozen. The
switching frequency is variable and decreases as the
output load decreases.
The switching frequency is set by the end of charge of
the capacitor connected to the CT pin. This capacitor is
charged with a constant current source and the
capacitor voltage is compared to an internal threshold
fixed by FB voltage. When this capacitor voltage
reaches the threshold the capacitor is rapidly discharged
down to 0 V and a new period start.
Figure 22. Operating Valley According to FB Voltage
VALLEY DETECTION AND SELECTION
The valley detection is done by monitoring the voltage of
the auxiliary winding of the transformer. A valley is detected
when the voltage on pin 1 crosses down the 55 mV internal
threshold. When a valley is detected, an internal counter is
incremented. The operating valley (1st, 2nd, 3rd or 4th) is
determined by the FB voltage as shown by Figure 22.
http://onsemi.com
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