NCP1239 Datasheet, PDF (1/38 Pages) ON Semiconductor – Low−Standby High Performance PWM Controller

NCP1239
Low−Standby High
Performance PWM Controller
Housed in SO−16 the NCP1239 represents a major leap toward
ultra−compact Switch Mode Power Supplies specifically tailored for
medium to high power off−line applications, e.g. notebook adapters.
The NCP1239 offers everything needed to build a rugged and efficient
power supply, including a dedicated event management to drive a
Power Factor Correction (PFC) front−end circuitry. The circuit
disables the front−end PFC stage while still in fault or standby
conditions by interrupting the PFC controller powering for improved
no−load consumption figures. As soon as normal operating mode
recovers, the NCP1239 feeds back the PFC that wakes−up.
When power demand is low, 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.
Features
• Current−Mode Operation with Internal Ramp Compensation
• Internal High−Voltage Current Source for loss−less Startup
• Adjustable Skip−Cycle Capability
• Selectable Soft−Start Period
• Internal Frequency Dithering for Improved EMI Signature
• Go−to−Standby Signal for PFC Front−Stage
• Large V_CC Operation from 12.2 V to 36 V
• 500 mV Overcurrent Limit
• 500 mA/−800 mA Peak Current Capability
• 5 V/10 mA Pinned−out Reference Voltage
• Adjustable Switching Frequency up to 250 kHz.
• Overload Protection Independent of the Auxiliary V_CC
• Adjustable Over Power Compensation (NCP1239F)
• Programmable Maximum Duty Cycle (NCP1239V)
• Pb−Free Packages are Available*
Typical Applications
• High Power AC/DC Adapters for Notebooks etc.
• Offline Battery Chargers
• Telecom and PC Power Supplies
• Flyback Applications (NCP1239F) and Forward Applications
(NCP1239V)
*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, 2005
1
October, 2005 − Rev. 5
http://onsemi.com
16
1
SO−16
FD or VD SUFFIX
CASE 751B
MARKING DIAGRAM
16
NCP1239xDG
AWLYWW
1
NCP1239xD = Device Code
x
= F or V
A
= Assembly Location
WL
= Wafer Lot
Y
= Year
WW
= Work Week
G
= Pb−Free Package
PIN CONNECTIONS
1
GTS
16
HV
REF5V
NC
Fault Detect
NC
Rt
Brown−out
SS/Timer
V_CC
Drv
GND
Skip Adjust
CS
FB
Over Power
NCP1239F ^Limit
1
GTS
16
HV
REF5V
NC
Fault Detect
NC
Rt
V_CC
Brown−out
Drv
SS/Timer
GND
Skip Adjust
CS
FB
Max Duty−
Cycle
NCP1239V
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 5 of this data sheet.
Publication Order Number
NCP1239/D