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PDF NCP1201 Data sheet ( Hoja de datos )
| Número de pieza | NCP1201 | |
| Descripción | PWM Current-Mode Controller | |
| Fabricantes | ON Semiconductor | |
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NCP1201
PWM Current−Mode
Controller for Universal
Off−Line Supplies Featuring
Low Standby Power with
Fault Protection Modes
Housed in SOIC−8 or PDIP−8 package, the NCP1201 enhances the
previous NCP1200 series by offering a reduced optocoupler current with
additional Brownout Detection Protection (BOK). Similarly, the circuit
allows the implementation of complete off−line AC−DC adapters, battery
chargers or Switchmode Power Supplies (SMPS) where standby power is
a key parameter.
The NCP1201 features efficient protection circuitry. When in the
presence of a fault (e.g. failed optocoupler, overcurrent condition, etc.)
the control permanently disables the output pulses to avoid subsequent
damage to the system. The IC only restarts when the user cycles the
mains power supply.
With the low power internal structure, operating at a fixed
60 or 100 kHz, the controller supplies itself from the high−voltage rail,
avoiding the need of an auxiliary winding. This feature naturally eases
the designer’s task in battery charger applications. Finally, current−mode
control provides an excellent audio−susceptibility and inherent
pulse−by−pulse control.
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When the load current falls down to a pre−defined setpoint (VSKIP)
value, e.g. the output power demand diminishes, the IC automatically
enters the skip cycle mode and can provide excellent efficiency under
light load conditions. The skip mode is designed to operate at relatively
lower peak current so that acoustic noise that commonly takes place will
not happen with NCP1201.
Features
• AC Line Brownout Detect Protection, BOK Function
• Latchoff Mode Fault Protection
• No Auxiliary Winding Operation
• Internal Output Short−Circuit Protection
• Extremely Low No−Load Standby Power
• Current−Mode with Skip−Cycle Capability
• Internal Overtemperature Shutdown
• Internal Leading Edge Blanking
• 250 mA Gate Peak Current Driving Capability
• Internally Fixed Switching Frequency at 60 or 100 kHz
• Built−in Frequency Jittering for EMI Reduction
• Direct Optocoupler Connection
• Pb−Free Packages are Available
Typical Applications
• AC−DC Adapters
• Offline Battery Chargers
• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
© Semiconductor Components Industries, LLC, 2006
February, 2006 − Rev. 4
1
http://onsemi.com
MARKING
DIAGRAMS
8
1
SOIC−8
D SUFFIX
CASE 751
8
201Dx
ALYW
G
1
8
1
8
PDIP−8
P SUFFIX
CASE 626
1201Py0
AWL
YYWWG
1
x = Device Code: 6 for 60 kHz
y 1 for 100 kHz
y = Device Code: 6 for 60 kHz
xx 10 for 100 kHz
A = Assembly Location
L = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = Pb−Free Package
PIN CONNECTIONS
BOK 1
FB 2
CS 3
GND 4
8 HV
7 NC
6 VCC
5 DRV
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 17 of this data sheet.
Publication Order Number:
NCP1201/D
1 page  
NCP1201
ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values TJ = −25°C to +125°C,
VCC = 11 V unless otherwise noted)
Characteristic
Symbol
Min Typ
DYNAMIC SELF−SUPPLY
VCC Increasing Level at which the Current Source Turns−Off
VCC Decreasing Level at which the Current Source Turns−On
Internal IC Current Consumption, No Output Load on Pin 5
Internal IC Current Consumption, 1.0 nF Output Load on Pin 5
NCP1201P60, NCP1201D60
NCP1201P100, NCP1201D100
VCCOFF
VCCON
ICC1
ICC2
11.5 12.5
9.6 10.5
440 905
0.75 1.6
1.6 2.1
Internal IC Current Consumption, Latchoff Phase
INTERNAL STARTUP CURRENT SOURCE
ICC3
405 575
High−Voltage Current Source at VCCON – 0.2 V
High−Voltage Current Source at VCC = 0 V
HV Pin Leakage Current @ 450 V, VCC Pin Connected to Ground
OUTPUT SECTION
IC1
IC2
ILEAK
3.6 5.3
7.5 11.1
− 30
Output Voltage Rise−Time (CL = 1.0 nF, 10 V Output)
Tr − 116
Output Voltage Fall−Time (CL = 1.0 nF, 10 V Output)
Tf − 41
Source Resistance (VDRV = )
Sink Resistance (VDRV = )
CURRENT SENSE SECTION (Pin 5 Unloaded)
ROH
ROL
26 38
4.0 10
Input Bias Current @ 1.0 V Input Level on Pin 3
Maximum Current Sense Input Threshold
Default Current Sense Threshold for Skip Cycle Operation
Propagation Delay from Current Detection to Gate OFF State
Leading Edge Blanking Duration
OSCILLATOR SECTION (VCC = 11 V, Pin 5 Loaded by 1.0 KW)
Oscillation Frequency
NCP1201P60, NCP1201D60
NCP1201P100, NCP1201D100
IIB−CS
VILIMIT
VILSKIP
TDEL
TLEB
FOSC
− 10
0.8 0.9
250 325
35 65
150 260
52 60
92 100
Built−in Frequency Jittering (as a function of Vcc voltage)
NCP1201P60, NCP1201D60
NCP1201P100, NCP1201D100
Fjitter
− 493
− 822
Maximum Duty Cycle
FEEDBACK SECTION (VCC = 11 V, Pin 5 Unloaded)
Internal Pullup Resistor
Feedback Pin to Pin 3 Current Setpoint Division Ratio
BROWNOUT DETECT SECTION
Dmax
RUP
Iratio
74 83
10 17
2.9 3.3
BOK Input Threshold Voltage
BOK Input Bias Current (VBOK < Vth)
Source Bias Current (Turn on After VBOK > Vth)
FREQUENCY SKIP CYCLE SECTION
Vth
IIB−BOK
ISC
1.75 1.92
− 11
40 50
Built−in Frequency Skip Cycle Comparator Voltage Threshold
THERMAL SHUTDOWN
VSKIP
0.96 1.07
Thermal Shutdown Trip Point, Temperature Rising (Note 3)
Thermal Shutdown Hysteresis
3. Verified by design.
TSD
THYST
− 145
− 25
Max
13.5
11.3
1300
2.2
2.8
772
7.1
15
70
−
−
60
22
100
1.0
390
160
400
72
117
−
−
87
24
4.0
2.05
100
58
1.18
−
−
Unit
V
V
mA
mA
mA
mA
mA
mA
ns
ns
W
W
nA
V
mV
ns
ns
kHz
Hz/V
%
kW
−
V
nA
mA
V
°C
°C
http://onsemi.com
5
5 Page 
NCP1201
Our power contribution example drops to 223 V x 2.1 m
= 468.3 mW. If a resistor is installed between the mains and
the diode, you further force the dissipation to migrate from
the package to the resistor. The resistor value should be
carefully selected to account for low−line startup.
HV
Mains
Cbulk
1
2
3
4
8
7
6
5
Figure 28. A Simple Diode Naturally Reduces the
Average Voltage on Pin 8
3. Permanently force the VCC level above VCCOFF
with an auxiliary winding. It will automatically
disconnect the internal startup source and the IC
will be fully self−supplied from this winding.
Again, the total power drawn from the mains will
significantly decrease. By using this approach,
user need to make sure the auxiliary voltage never
exceeds the 16 V limit for all line conditions.
Skipping Cycle Mode
The NCP1201 automatically skips switching cycles when
the output power demand drops below a preset level. This is
accomplished by monitoring the FB pin. In normal
operation, FB pin imposes a peak current according to the
load value. If the load demand decreases, the internal loop
asks for less peak current. When this set−point reaches the
skip mode threshold level, 1.07 V, the IC prevents the
current from decreasing further down and starts to blank the
output pulses, i.e. the controller enters the so−called Skip
Cycle Mode, also named Controlled Burst Operation. The
power transfer now depends upon the width of the pulse
bunches, Figure 29.
Suppose we have the following component values:
Lp, primary inductance = 1.0 mH
Fsw, switching frequency = 60 kHz
Ip (skip) = 200 mA (or 333 mV/Rsense)
The theoretical power transfer is therefore:
1
2
Lp
Ip2
Fsw + 1.2 W
(eq. 4)
If the controller enters Skip Cycle Mode with a pulse packet
length of 20 ms over a recurrent period of 100 ms, then the
total power transfer reduced to 1.2 W x 0.2 = 240 mW.
To better understand how this Skip Cycle Mode takes
place, a look at the operation mode versus the FB pin voltage
level shown below, immediately gives the necessary insight.
FB
Normal Current Mode Operation
4.2 V, FB Pin Open
2.97 V, Upper Dynamic Range
Skip Cycle Operation
Ip(min) = 333 mV / Rsense
1.07 V
Figure 29. Feedback Pin Voltage and Modes of Operation
When FB pin voltage level is above the skip cycle threshold
(1.07 V by default), the peak current cannot exceed
0.9 V/Rsense. When the IC enters the skip cycle mode, the
peak current cannot go below VSKIP/3.3. By using the peak
current limit reduction scheme, the skip cycle takes place at
a lower peak current, which guarantees noise free operation.
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| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet NCP1201.PDF ] | |
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