Current-Mode PWM Controller for Off-line Power Supplies

The NCP1250 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a tiny TSOP−6 package. With a supply range up to 28 V, the controller hosts a jittered 65 kHz or 100 kHz switching circuitry operated in peak current mode control.

Features Fixed−Frequency 65 or 100 kHz Current−Mode Control Operation
Internal and Adjustable Over Power Protection (OPP) Circuit
Frequency Foldback Down to 26 kHz and Skip−Cycle in Light Load Conditions
Internal Ramp Compensation
Internal Fixed 4 ms Soft−Start
100 ms Timer−Based Auto−Recovery Short−Circuit Protection
Frequency Jittering in Normal and Frequency Foldback Modes
Option for Auto−Recovery or Latched Short−Circuit Protection
OVP Input for Improved Robustness
Up to 28 V VCCOperation
+300 mA / −500 mA Source/Sink Drive Capability
Less than 100 mW Standby Power at High Line
EPS 2.0 Compliant
These are Pb−Free Devices

Typical Applications ac−dc Converters for TVs, Set−top Boxes and Printers
Offline Adapters for Notebooks and Netbooks

Manufacturer	onsemi
Product Category	AC DC Converters, Offline Switchers
Series	NCP1250
Packaging	Tape & Reel (TR)
Unit-Weight	0.000705 oz
Mounting-Style	SMD/SMT
Package-Case	SOT-23-6 Thin, TSOT-23-6
Operating-Temperature	-40°C ~ 125°C (TJ)
Mounting-Type	Surface Mount
Supplier-Device-Package	6-TSOP
Watt	-
Number-of-Outputs	1 Output
Output-Isolation	Isolated
Internal-Switch-s	No
Voltage-Breakdown	-
Topology	Flyback
Voltage-Start-Up	18V
Voltage-Supply-Vcc-Vdd	8.8 V ~ 28 V
Duty-Cycle	80%
Frequency-Switching	65kHz
Fault-Protection	Over Power, Over Voltage, Short Circuit
Control-Features	-
Maximum Operating Temperature	+ 125 C
Operating temperature range	- 40 C
Operating-Supply-Voltage	28 V
Operating-Supply-Current	2.1 mA
Output-Current	300 mA
Switching-Frequency	65 kHz
Fall-Time	30 ns
Rise-Time	40 ns
Package-Case	TSOP-6
Duty-Cycle-Max	84 %