NCP1294
Flyback, Boost, Forward
PWM Controller
The NCP1294 fixed frequency feed forward voltage mode PWM
controller contains all of the features necessary to be configured in a
Flyback, Boost or Forward topology. This PWM controller has been
optimized for high frequency primary side control operation. In
addition, this device includes such features as: Soft−Start, accurate
duty cycle limit control, less than 50mA startup current, over and
undervoltage protection, and bidirectional synchronization. The
NCP1294 is available in a 16 lead SOIC narrow surface mount
package.
Features
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SOIC−16
D SUFFIX
CASE 751B
TSSOP−16
DB SUFFIX
CASE 948F
1
16
1
16
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1.0 MHz Frequency Capability
Fixed Frequency Voltage Mode Operation, with Feed Forward
Thermal Shutdown
Undervoltage Lock−Out
Accurate Programmable Max Duty Cycle Limit
1.0 A Sink/Source Gate Drive
Programmable Pulse−By−Pulse Overcurrent Protection
Leading Edge Current Sense Blanking
75 ns Shutdown Propagation Delay
Programmable Soft−Start
Undervoltage Protection
Overvoltage Protection with Programmable Hysteresis
Bidirectional Synchronization
25 ns GATE Rise and Fall Time (1.0 nF Load)
3.3 V 3% Reference Voltage Output
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
PIN CONNECTIONS AND
MARKING DIAGRAM
GATE
I
SENSE
SYNC
FF
UV
OV
R
T
C
T
I
SET
1
NCP1294EG
AWLYWW
NCP
1294
ALYW
G
16
V
C
PGND
V
CC
V
REF
LGND
SS
COMP
V
FB
16
1
NCP1294= Specific Device Code
A
= Assembly Location
WL, L = Wafer Lot
YY, Y
= Year
WW, W = Work Week
G or
G
= Pb−Free Package
ORDERING INFORMATION
Device
NCP1294EDR2G
Package
SOIC−16
(Pb−Free)
Shipping
†
2500 Tape & Reel
NCP1294EDBR2G TSSOP−16
(Pb−Free)
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
2500 Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Publication Order Number:
NCP1294/D
©
Semiconductor Components Industries, LLC, 2009
July, 2009
−
Rev. 0
1
NCP1294
MAXIMUM RATINGS
Rating
Operating Junction Temperature, T
J
Lead Temperature Soldering:
Storage Temperature Range, T
S
ESD (Human Body Model)
Reflow: (SMD styles only) (Note 1)
Value
Internally
Limited
230 peak
−65
to +150
2.0
Unit
−
°C
°C
kV
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.
1. 60 second maximum above 183°C.
MAXIMUM RATINGS
Pin Name
Gate Drive Output
Current Sense Input
Timing Resistor/Capacitor
Feed Forward
Error Amp Output
Feedback Voltage
Sync Input
Undervoltage
Overvoltage
Current Set
Soft−Start
Logic Section Supply
Power Section Supply
Reference Voltage
Power Ground
Logic Ground
Pin Symbol
GATE
I
SENSE
R
T
C
T
FF
COMP
V
FB
SYNC
UV
OV
I
SET
SS
V
CC
V
C
V
REF
PGND
LGND
V
MAX
15 V
6.0 V
6.0 V
6.0 V
6.0 V
6.0 V
6.0 V
6.0 V
6.0 V
6.0 V
6.0 V
15 V
15 V
6.0 V
N/A
N/A
V
MIN
−0.3
V
−0.3
V
−0.3
V
−0.3
V
−0.3
V
−0.3
V
−0.3
V
−0.3
V
−0.3
V
−0.3
V
−0.3
V
−0.3
V
−0.3
V
−0.3
V
N/A
N/A
I
SOURCE
1.0 A Peak, 200 mA DC
1.0 mA
1.0 mA
1.0 mA
10 mA
1.0 mA
10 mA
1.0 mA
1.0 mA
1.0 mA
1.0 mA
10 mA
10 mA
lnternally Limited
1.0 A Peak, 200 mA DC
N/A
I
SINK
1.0 A Peak, 200 mA DC
1.0 mA
10 mA
25 mA
20 mA
1.0 mA
10 mA
1.0 mA
1.0 mA
1.0 mA
10 mA
50 mA
1.0 A Peak, 200 mA DC
10 mA
N/A
N/A
ELECTRICAL CHARACTERISTICS
(−40°C < T
A
< 85°C;
−40°C
< T
J
< 125°C; 3.0 V < V
C
< 15 V; 4.7 V < V
CC
< 15 V;
R
T
= 12 k; C
T
= 390 pF; unless otherwise specified.)
Characteristic
Start/Stop Voltages
Start Threshold
Stop Threshold
Hysteresis
I
CC
@ Startup
Supply Current
I
CC
Operating
I
C
Operating
I
C
Operating
1.0 nF Load on GATE
No Switching
−
−
−
−
9.5
12
2.0
14
18
4.0
mA
mA
mA
Start−Stop
V
CC
< UVL Start Threshold
−
−
4.4
3.2
400
−
4.6
3.8
850
38
4.7
4.1
1400
75
V
V
mV
mA
Test Conditions
Min
Typ
Max
Unit
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3
NCP1294
ELECTRICAL CHARACTERISTICS
(−40°C < T
A
< 85°C;
−40°C
< T
J
< 125°C; 3.0 V < V
C
< 15 V; 4.7 V < V
CC
< 15 V;
R
T
= 12 k; C
T
= 390 pF; unless otherwise specified.)
Characteristic
Gate Driver
High Saturation Voltage
Low Saturation Voltage
High Voltage Clamp
Output Current
Output UVL Leakage
Rise Time
Fall Time
Max Gate Voltage During UVL/Sleep
Feed Forward (FF)
Discharge Voltage
Discharge Current
FF to GATE Delay
Overcurrent Protection
Overcurrent Threshold
I
SENSE
to GATE Delay
External Voltage Monitors
Overvoltage Threshold
Overvoltage Hysteresis Current
Undervoltage Threshold
Undervoltage Hysteresis
Soft−Start (SS)
Charge Current
Discharge Current
Charge Voltage
Discharge Voltage
Soft−Start Clamp Offset
Soft−Start Fault Voltage
Blanking
Blanking Time
SS Blanking Disable Threshold
COMP Blanking Disable Threshold
Thermal Shutdown
Thermal Shutdown
Thermal Hysteresis
Note 3
Note 3
125
5.0
150
10
180
15
°C
°C
V
FB
< 1.0
V
FB
< 1.0, SS > 3.0 V
−
50
2.8
2.8
150
3.0
3.0
250
3.3
3.3
ns
V
V
FF = 1.25 V
OV = 2.15 V or LV = 0.85 V
SS = 2.0 V
SS = 2.0 V
−
−
40
4.0
2.8
0.25
1.15
−
50
5.0
3.0
0.3
1.25
0.1
70
7.0
3.4
0.35
1.35
0.2
mA
mA
V
V
V
V
OV Increasing
OV = 2.15 V
UV Increasing
−
1.9
10
0.95
25
2.0
12.5
1.0
75
2.1
15
1.05
125
V
mA
V
mV
I
SET
= 0.5 V, Ramp I
SENSE
−
0.475
50
0.5
90
0.525
125
V
ns
I
FF
= 2.0 mA
FF = 1.0 V
−
−
2.0
50
0.3
16
75
0.7
30
125
V
mA
ns
1.0 nF Load. Note 3
GATE = 0 V
1.0 nF Load, V
C
= 20 V, 1.0 V < GATE < 9.0 V
1.0 nF Load, V
C
= 20 V, 9.0 V < GATE < 1.0 V
I
GATE
= 500
mA
V
C
−
GATE, V
C
= 10 V, I
SOURCE
= 200 mA
GATE
−
PGND, I
SINK
= 200 mA
−
−
−
11
−
−
−
−
0.4
1.5
1.2
13.5
1.0
1.0
60
25
0.7
2.0
1.5
16
1.25
50
100
50
1.0
V
V
V
A
mA
ns
ns
V
Test Conditions
Min
Typ
Max
Unit
3. Guaranteed by design, not 100% tested in production.
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5
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