NCP1294EDR2G Datasheet, PDF (1/13 Pages) ON Semiconductor – Flyback, Boost, Forward PWM Controller

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
http://onsemi.com
16
1
SOIC−16
D SUFFIX
CASE 751B
16
1
TSSOP−16
DB SUFFIX
CASE 948F
PIN CONNECTIONS AND
MARKING DIAGRAM
1
GATE
I_SENSE
SYNC
FF
UV
OV
R_TC_T
I_SET
16
V_C
PGND
V_CC
V_REF
LGND
SS
COMP
V_FB
16
NCP
1294
ALYW
1
G
NCP1294= Specific Device Code
A
= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
G or G = Pb−Free Package
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2009
1
July, 2009 − Rev. 0
ORDERING INFORMATION
Device
Package
Shipping^†
NCP1294EDR2G SOIC−16 2500 Tape & Reel
(Pb−Free)
NCP1294EDBR2G TSSOP−16 2500 Tape & Reel
(Pb−Free)
†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