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PDF NCP1200A Data sheet ( Hoja de datos )
| Número de pieza | NCP1200A | |
| Descripción | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power | |
| Fabricantes | ON | |
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NCP1200A
PWM Current-Mode
Controller for Universal
Off-Line Supplies Featuring
Low Standby Power
Housed in SOIC−8 or PDIP−8 package, the NCP1200A enhances
the previous NCP1200 series by offering a reduced optocoupler
current together with an increased drive capability. Due to its novel
concept, the circuit allows the implementation of complete off−line
AC−DC adapters, battery charger or a SMPS where standby power is
a key parameter.
With an internal structure operating at a fixed 40 kHz, 60 kHz 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 task in battery charger applications. Finally,
current−mode control provides an excellent audio−susceptibility and
inherent pulse−by−pulse control.
When the current setpoint falls below a given value, e.g. the output
power demand diminishes, the IC automatically enters the so−called
skip cycle mode and provides excellent efficiency at light loads.
Because this occurs at a user adjustable low peak current, no acoustic
noise takes place.
The NCP1200A features an efficient protective circuitry which, in
presence of an overcurrent condition, disables the output pulses while
the device enters a safe burst mode, trying to restart. Once the default
has gone, the device auto−recovers.
Features
• No Auxiliary Winding Operation
• Auto−Recovery Internal Output Short−Circuit Protection
• Extremely Low No−Load Standby Power
• Current−Mode Control with Skip−Cycle Capability
• Internal Temperature Shutdown
• Internal Leading Edge Blanking
• 250 mA Peak Current Capability
• Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
• Direct Optocoupler Connection
• SPICE Models Available for TRANsient and AC Analysis
• Pin to Pin Compatible with NCP1200
• Pb−Free Packages are Available
Typical Applications
• AC−DC Adapters for Portable Devices
• Offline Battery Chargers
• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
http://onsemi.com
MINIATURE PWM
CONTROLLER FOR HIGH
POWER AC−DC WALL
ADAPTERS AND OFFLINE
BATTERY CHARGERS
8
1
8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
200Ax
ALYW
G
1
PDIP−8
P SUFFIX
CASE 626
8
1200APyy
AWL
YYWWG
1
x = 1, 4, or 6
yy = 40, 60, or 100
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = Pb−Free Package
PIN CONNECTIONS
Adj 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 14 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
January, 2011 − Rev. 9
1
Publication Order Number:
NCP1200A/D
1 page  
NCP1200A
TYPICAL CHARACTERISTICS
70 12.5
60 12.3
50 12.1
40 11.9
30 11.7
20 11.5
10 11.3
0
−25
0
25 50 75 100 125
TEMPERATURE (°C)
Figure 3. HV Pin Leakage Current vs. Temperature
11.1
−25
0 25 50 75 100
TEMPERATURE (°C)
Figure 4. VCC(off) vs. Temperature
10.2 900
10.1 850
10.0 800 100 kHz
9.9 750
60 kHz
9.8 700
40 kHz
9.7 650
9.6
−25
0 25 50 75 100
TEMPERATURE (°C)
Figure 5. VCC(on) vs. Temperature
125
600
−25
0 25 50 75 100
TEMPERATURE (°C)
Figure 6. ICC1 vs. Temperature
125
125
2.10
1.90
1.70
1.50
1.30
1.10
0.90
−25
100 kHz
110
104
100 kHz
98
92
86
80
60 kHz
40 kHz
74
68
62 60 kHz
56
50
44
40 kHz
0
25
50
75 100 125
38
−25
0
25 50 75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 7. ICC2 vs. Temperature
Figure 8. Switching Frequency vs. Temperature
http://onsemi.com
5
5 Page 
VCC
12 V
10 V
5.4 V
NCP1200A
REGULATION
OCCURS
HERE
LATCHOFF
PHASE
TIM
Drv E
INTERNAL
FAULT FLAG
DRIVER
PULSES
DRIVER
PULSES
TIM
E
STARTUP PHASE
FAULT IS
RELAXED
FAULT OCCURS HERE
TIM
E
Figure 21. If the fault is relaxed during the VCC natural fall down sequence, the IC automatically resumes.
If the fault still persists when VCC reached UVLOL, then the controller cuts everything off until recovery.
When this level crosses 5.4 V typical, the controller enters
a new startup phase by turning the current source on: VCC
rises toward 12 V and again delivers output pulses at the
UVLOH crossing point. If the fault condition has been
removed before UVLOL approaches, then the IC continues
its normal operation. Otherwise, a new fault cycle takes
place. Figure 21 shows the evolution of the signals in
presence of a fault.
Calculating the VCC Capacitor
As the above section describes, the fall down sequence
depends upon the VCC level: how long does it take for the
VCC line to go from 12 V to 10 V? The required time
depends on the startup sequence of your system, i.e. when
you first apply the power to the IC. The corresponding
transient fault duration due to the output capacitor charging
must be less than the time needed to discharge from 12 V to
10 V, otherwise the supply will not properly start. The test
consists in either simulating or measuring in the lab how
much time the system takes to reach the regulation at full
load. Let’s suppose that this time corresponds to 6 ms.
Therefore a VCC fall time of 10 ms could be well
appropriated in order to not trigger the overload detection
circuitry. If the corresponding IC consumption, including
the MOSFET drive, establishes at 1.8 mA for instance, we
can calculate the required capacitor using the following
formula:
Dt
+
DV @
i
C
, with DV = 2 V. Then for a wanted
Dt of 10 ms, C equals 9 mF or 22 mF for a standard value.
When an overload condition occurs, the IC blocks its
internal circuitry and its consumption drops to 350 mA
typical. This happens at VCC = 10 V and it remains stuck
until VCC reaches 5.4 V: we are in latchoff phase. Again,
using the calculated 22 mF and 350 mA current
consumption, this latchoff phase lasts: 296 ms.
http://onsemi.com
11
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