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NCP1216, NCP1216A
PWM Current−Mode
Controller for High−Power
Universal Off−Line Supplies
Housed in a SOIC−8 or PDIP−7 package, the NCP1216 represents
an enhanced version of NCP1200 based controllers. Due to its high
drive capability, NCP1216 drives large gate−charge MOSFETs, which
together with internal ramp compensation and built−in frequency
jittering, ease the design of modern AC−DC adapters.
With an internal structure operating at different fixed frequencies,
the controller supplies itself from the high−voltage rail, avoiding the
need of an auxiliary winding. This feature naturally eases the designer
task in some particular applications, e.g. battery chargers or TV sets.
Current−mode control also provides an excellent input audio
susceptibility and inherent pulse−by−pulse control. Internal ramp
compensation easily prevents sub−harmonic oscillations from taking
place in continuous conduction mode designs.
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 NCP1216 features an efficient protective circuitry, which in
presence of an over current 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
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MARKING
DIAGRAMS
8
8
1
SOIC−8
D SUFFIX
CASE 751
1
16XXX
ALYW
G
PDIP−7
P SUFFIX
CASE 626B
1
P1216XXXX
AWL
YYWWG
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
No Auxiliary Winding Operation
Current−Mode Control with Adjustable Skip−Cycle Capability
Internal Ramp Compensation
Limited Duty Cycle to 50% (NCP1216A Only)
Internal 1.0 ms Soft−Start (NCP1216A Only)
Built−In Frequency Jittering for Better EMI Signature
Auto−Recovery Internal Output Short−Circuit Protection
Extremely Low No−Load Standby Power
500 mA Peak Current Capability
Fixed Frequency Versions at 65 kHz, 100 kHz, 133 kHz
Internal Temperature Shutdown
Direct Optocoupler Connection
SPICE Models Available for TRANsient and AC Analysis
Pin−to−Pin Compatible with NCP1200 Series
Pb−Free Packages are Available
XXXX
A
WL, L
YY, Y
WW, W
G or
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
DEVICE MARKING INFORMATION
See detailed device marking information in the ordering
information section on page 16 of this data sheet.
PIN CONNECTIONS
Adj 1
FB 2
CS 3
Gnd 4
8 HV
7 NC
6 V
CC
5 Drv
Typical Applications
High Power AC−DC Converters for TVs, Set−Top Boxes, etc.
Offline Adapters for Notebooks
Telecom DC−DC Converters
All Power Supplies
1
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering
information section on page 16 of this data sheet.
©
Semiconductor Components Industries, LLC, 2007
April, 2007 − Rev. 11
Publication Order Number:
NCP1216/D
NCP1216, NCP1216A
+
*See Application Section
NCP1216
+
EMI
Filter
1
Fosc = 35kHz
HV 8
Adj
2 FB
7
3
4
CS Vcc 6
GNDDrv 5
R
comp
Universal Input
+
R
sense
Figure 1. Typical Application Example
Á
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ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
PIN FUNCTION DESCRIPTION
Pin No.
1
Pin Name
Adj
Function
Pin Description
Adjust the Skipping Peak Current
This pin lets you adjust the level at which the cycle skipping process
takes place. Shorting this pin to ground, permanently disables the skip
cycle feature.
By connecting an Optocoupler to this pin, the peak current setpoint is
adjusted accordingly to the output power demand.
This pin senses the primary current and routes it to the internal
comparator via an L.E.B. By inserting a resistor in series with the pin,
you control the amount of ramp compensation you need.
−
The driver’s output to an external MOSFET.
This pin is connected to an external bulk capacitor of typically 22
mF.
This un−connected pin ensures adequate creepage distance.
Connected to the high−voltage rail, this pin injects a constant current
into the V
CC
bulk capacitor.
2
3
FB
CS
Sets the Peak Current Setpoint
Current Sense Input
4
5
6
7
8
GND
Drv
V
CC
NC
HV
IC Ground
Driving Pulses
Supplies the IC
−
Generates the V
CC
from the Line
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2
NCP1216, NCP1216A
Adj
1
HV Current Source
96 k
1.1 V
Skip Cycle Comparator
Internal V
CC
+
−
Clock Jittering
8
HV
FB
2
UVLO High and Low
Internal Regulator
7
NC
25 k
Current
3
Sense
220 ns
L.E.B
19 k
20 k
Ramp
Compensation
65 kHz
100 kHz
133kHz
+
−
1V
Set Q Flip−Flop Q
D
Cmax
= 75%
Reset
$500
mA
1 ms SS*
6
V
CC
GND
4
5
Drv
+
−
Pull−up Resistor 57 k
V
ref
25 k
5V
Overload?
Fault Duration
* Available for ”A” version only.
Figure 2. Internal Circuit Architecture
MAXIMUM RATINGS
Rating
Power Supply Voltage, V
CC
Pin
Maximum Voltage on Low Power Pins (except Pin 8 and Pin 6)
Maximum Voltage on Pin 8 (HV), Pin 6 (V
CC
) Decoupled to Ground with 10
mF
Maximum Voltage on Pin 8 (HV), Pin 6 (V
CC
) Grounded
Minimum Operating Voltage on Pin 8 (HV)
Maximum Current into all Pins except V
CC
(Pin 6) and HV (Pin 8) when 10 V ESD
Diodes are Activated
Thermal Resistance Junction−to−Air, PDIP−7 Version
Thermal Resistance Junction−to−Air, SOIC−8 Version
Maximum Junction Temperature
Temperature Shutdown
Hysteresis in Shutdown
Storage Temperature Range
ESD Capability, HBM Model (All Pins except V
CC
and HV)
ESD Capability, Machine Model
R
qJ−A
R
qJ−A
T
JMAX
TSD
Symbol
V
CC
Value
16
−0.3 to 10
500
450
28
5.0
100
178
150
155
30
−60 to +150
2.0
200
Unit
V
V
V
V
V
mA
°C/W
°C
°C
°C
°C
kV
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
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3
NCP1216, NCP1216A
ELECTRICAL CHARACTERISTICS
(For typical values T
J
= 25°C, for min/max values T
J
= 0°C to +125°C, Maximum T
J
= 150°C,
V
CC
= 11 V unless otherwise noted.)
Characteristic
DYNAMIC SELF−SUPPLY
V
CC
Increasing Level at which the Current Source Turns Off
V
CC
Decreasing Level at which the Current Source Turns On
V
CC
Decreasing Level at which the Latchoff Phase Ends
Internal IC Consumption, No Output Load on Pin 5, F
SW
= 65 kHz
Internal IC Consumption, No Output Load on Pin 5, F
SW
= 100 kHz
Internal IC Consumption, No Output Load on Pin 5, F
SW
= 133 kHz
Internal IC Consumption, 1.0 nF Output Load on Pin 5, F
SW
= 65 kHz
Internal IC Consumption, 1.0 nF Output Load on Pin 5, F
SW
= 100 kHz
Internal IC Consumption, 1.0 nF Output Load on Pin 5, F
SW
= 133 kHz
Internal IC Consumption, Latchoff Phase, V
CC
= 6.0 V
INTERNAL STARTUP CURRENT SOURCE
(T
J
> 0°C)
High−voltage Current Source, V
CC
= 10 V
High−voltage Current Source, V
CC
= 0 V
DRIVE OUTPUT
Output Voltage Rise−time @ C
L
= 1.0 nF, 10−90% of a 12 V Output Signal
Output Voltage Fall−time @ C
L
= 1.0 nF, 10−90% of a 12 V Output Signal
Source Resistance
Sink Resistance
CURRENT COMPARATOR
(Pin 5 Unloaded)
Input Bias Current @ 1.0 V Input Level on Pin 3
Maximum Internal Current Setpoint
Default Internal Current Setpoint for Skip Cycle Operation
Propagation Delay from Current Detection to Gate OFF State
Leading Edge Blanking Duration
1.
V
CC
OFF
and
V
CC
ON
min−max always ensure an hysteresis of 2.0 V.
2. Maximum value at T
J
= 0°C.
3. Minimum value for T
J
= 125°C.
3
3
3
3
3
I
IB
I
Limit
I
Lskip
T
DEL
T
LEB
0.93
0.02
1.08
330
80
220
130
1.14
mA
V
mV
ns
ns
5
5
5
5
T
r
T
f
R
OH
R
OL
15
5.0
60
20
20
10
35
18
ns
ns
W
W
8
8
IC1
IC2
4.9
(Note 3)
8.0
9.0
11
mA
mA
NCP1216
NCP1216A
6
6
6
6
6
6
6
6
6
6
VCC
OFF
VCC
ON
VCC
latch
I
CC1
I
CC1
I
CC1
I
CC2
I
CC2
I
CC2
I
CC3
11.2
9.2
12.2
10.0
5.6
990
1025
1060
1.7
2.1
2.4
250
320
1110
(Note 2)
1180
(Note 2)
1200
(Note 2)
2.0
(Note 2)
2.4
(Note 2)
2.9
(Note 2)
13.4
(Note 1)
11.0
(Note 1)
V
V
V
mA
mA
mA
mA
mA
mA
mA
Pin
Symbol
Min
Typ
Max
Unit
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4
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