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NCP1294EDBR2G

P1-P3P4-P6P7-P9P10-P12P13-P13
© Semiconductor Components Industries, LLC, 2009
July, 2009 − Rev. 0
1 Publication Order Number:
NCP1294/D
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
• 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
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
V
FB
I
SET
1
NCP1294EG
AWLYWW
16
COMPR
T
C
T
SSOV
LGNDUV
V
REF
FF
V
CC
SYNC
PGNDI
SENSE
V
C
GATE
PIN CONNECTIONS AND
MARKING DIAGRAM
1
16
http://onsemi.com
Device Package Shipping
†
ORDERING INFORMATION
NCP1294EDR2G SOIC−16
(Pb−Free)
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.
NCP1294EDBR2G TSSOP−16
(Pb−Free)
SOIC−16
D SUFFIX
CASE 751B
1
16
TSSOP−16
DB SUFFIX
CASE 948F
NCP1294= Specific Device Code
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
G or G = Pb−Free Package
NCP
1294
ALYW
G
1
16
2500 Tape & Reel
NCP1294
http://onsemi.com
2
Figure 1. Application Diagram, 36 V−72 V to 5.0 V/5.0 A Converter
UV
OV
I
SET
FF
GATE
I
SENSE
PGND
V
C
V
REF
COMP
V
FB
R
T
C
T
SYNC
SS
LGND
NCP1294
V
CC
0.01 mF
330 pF
2200 pF
1.0 mF
10 k 200
0.22 mF
FZT688
51 k
11 V
V
IN
(36 V to 72 V)
22 mF
18 V
160 k
10
0.1 mF
470 pF
24.3 k
20.25 k
510 k
4.3 k
13 k
10
62
5.6 k
150
4700 pF
1.0 k
10 k
IRF634
10
100 pF
10
680 pF
D13
V33MLA1206A23
MBRB2545CT
T3
100:1
T1
4:1
T2
2:5
100
BAS21
1.0 mF
100 mF
V
OUT
(5.0 V/5.0 A)
SGND
180 1.0 k
TL431
0.1 mF
5.1 k
2.0 k
2.0 k
D11
BAS21
MOC81025
NCP1294
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3
MAXIMUM RATINGS
Rating Value Unit
Operating Junction Temperature, T
J
Internally
Limited
−
Lead Temperature Soldering: Reflow: (SMD styles only) (Note 1) 230 peak °C
Storage Temperature Range, T
S
−65 to +150 °C
ESD (Human Body Model) 2.0 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 Pin Symbol V
MAX
V
MIN
I
SOURCE
I
SINK
Gate Drive Output GATE 15 V −0.3 V 1.0 A Peak, 200 mA DC 1.0 A Peak, 200 mA DC
Current Sense Input I
SENSE
6.0 V −0.3 V 1.0 mA 1.0 mA
Timing Resistor/Capacitor R
T
C
T
6.0 V −0.3 V 1.0 mA 10 mA
Feed Forward FF 6.0 V −0.3 V 1.0 mA 25 mA
Error Amp Output COMP 6.0 V −0.3 V 10 mA 20 mA
Feedback Voltage V
FB
6.0 V −0.3 V 1.0 mA 1.0 mA
Sync Input SYNC 6.0 V −0.3 V 10 mA 10 mA
Undervoltage UV 6.0 V −0.3 V 1.0 mA 1.0 mA
Overvoltage OV 6.0 V −0.3 V 1.0 mA 1.0 mA
Current Set I
SET
6.0 V −0.3 V 1.0 mA 1.0 mA
Soft−Start SS 6.0 V −0.3 V 1.0 mA 10 mA
Logic Section Supply V
CC
15 V −0.3 V 10 mA 50 mA
Power Section Supply V
C
15 V −0.3 V 10 mA 1.0 A Peak, 200 mA DC
Reference Voltage V
REF
6.0 V −0.3 V lnternally Limited 10 mA
Power Ground PGND N/A N/A 1.0 A Peak, 200 mA DC N/A
Logic Ground LGND N/A N/A 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
Test Conditions Min Typ Max Unit
Start/Stop Voltages
Start Threshold
− 4.4 4.6 4.7 V
Stop Threshold − 3.2 3.8 4.1 V
Hysteresis Start−Stop 400 850 1400 mV
I
CC
@ Startup V
CC
< UVL Start Threshold − 38 75
mA
Supply Current
I
CC
Operating − − 9.5 14 mA
I
C
Operating 1.0 nF Load on GATE − 12 18 mA
I
C
Operating No Switching − 2.0 4.0 mA
P1-P3P4-P6P7-P9P10-P12P13-P13

NCP1294EDBR2G

Mfr. #:
Buy NCP1294EDBR2G
Manufacturer:
ON Semiconductor
Description:
Switching Controllers ANA PWM VOLT MODE CNTR
Lifecycle:
New from this manufacturer.
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