The NCP1338 combines a true current mode modulator and a demagnetization detector which ensures full Borderline/Critical Conduction Mode in any load/line conditions together with minimum drain voltage switching (Quasi−Resonant operation). The transformer core reset detection is done internally, without using any external signal, due to the Soxyless concept. The frequency is internally limited to 130 kHz, preventing the controller from operating above the 150 kHz CISPR−22 EMI starting limit.

Features• Free−Running Borderline/Critical Mode Quasi−Resonant Operation
• Current−Mode
• Soft−Skip Mode with Minimum Switching Frequency for Standby
• Auto−Recovery Short−Circuit Protection Independent of Auxiliary Voltage
• Overvoltage Protection
• Brown−Out Protection
• Two Externally Triggerable Fault Comparators (one for a disable function, and the other for a permanent latch)
• Internal 4.0 ms Soft−Start
• 500 mA Peak Current Drive Sink Capability
• 130 kHz Max Frequency
• Internal Leading Edge Blanking
• Internal Temperature Shutdown
• Direct Optocoupler Connection
• Dynamic Self−Supply with Levels of 12 V (On) and 10 V (Off)
• SPICE Models Available for TRANsient and AC Analysis
• These are Pb−Free Devices

Typical Applications• AC−DC Adapters for Notebooks, etc.
• Offline Battery Chargers
• Consumer Electronics (DVD Players, Set−Top Boxes, TVs, etc.)
• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)

Manufacturer	onsemi
Product Category	AC DC Converters, Offline Switchers
Series	-
Product	Off-Line Controllers
Packaging	Alternate Packaging
Mounting-Style	SMD/SMT
Package-Case	14-SOIC (0.154", 3.90mm Width) 13 Leads
Operating-Temperature	-40°C ~ 125°C (TJ)
Mounting-Type	Surface Mount
Supplier-Device-Package	14-SOIC
Watt	-
Number-of-Outputs	1 Output
Output-Isolation	Isolated
Internal-Switch-s	No
Voltage-Breakdown	-
Topology	Flyback
Voltage-Start-Up	15V
Voltage-Supply-Vcc-Vdd	10 V ~ 28 V
Duty-Cycle	-
Frequency-Switching	-
Fault-Protection	Current Limiting, Over Load, Over Temperature, Over Voltage
Control-Features	-
Shutdown	Yes
Isolation	Non-Isolated
Maximum Operating Temperature	+ 125 C
Operating temperature range	- 40 C
Operating-Supply-Voltage	10 V to 28 V
Output-Voltage	12 V
Operating-Supply-Current	1.6 mA
Input-Voltage	10 V to 28 V
Output-Current	800 mA
Switching-Frequency	25 kHz
Fall-Time	20 ns
Rise-Time	40 ns
Package-Case	SOIC-14
Duty-Cycle-Max	10 %