NCP1294 Datasheet, PDF (1/13 Pages) ON Semiconductor – Enhanced Voltage Mode 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