20N1 Active Clamp Forward Series — Data Sheet

Key features & specifications

TopologyActive Clamp Forward

Freq. Range180–240 kHz typical

Isolation1500–2250 Vdc

Power Range30–80 W

Efficiency94% typical

Core PlatformER20 (custom)

Insulation ClassH

Oper. Temp.−55 to +155 °C

Optimized for opto-isolated Active Clamp Forward & synchronous-rectifier converter designs. Aggressive interleave planar construction achieves the lowest leakage inductance; multilayer PCB optimization minimizes AC resistance & proximity loss. Integer turns 1–16 available (contact us if not shown). Options: surface mount, thru-hole, pad-to-pad, thermal pad, embedded planar windings. Demonstration boards available.

Part number & parameter table

Stresses beyond values listed may cause permanent damage. Functional operation beyond any rating is not implied. All values at T_amb = 25 °C unless noted.

Part Number	Topology	Vin Min (V)	Vin Nom (V)	Vin Max (V)	Vout (V)	Output Power (W)	Frequency (kHz)	Data Sheet	Simulation	LTSpice	Output Inductor
20N1-1202-80R	Active Clamp Forward	36	48	72	3.3	60	240	PDF	—	—	PQL2050-3R3-22
20N1-0802-80R	Active Clamp Forward	36	48	72	5.0	60	240	PDF	—	—	PQL2050-4R9-14
20N1-1005	Active Clamp Forward	36	48	72	12.0	60	240	PDF	—	—	PQi2050-20-HX
20N1-1012	Active Clamp Forward	36	48	72	24.0	60	240	PDF	—	—	PQI2050-100-6-LTC
20N1-0702-40R	Active Clamp Forward	18	28	36	3.3	60	240	PDF	—	—	PQL2050-3R3-22
20N1-0603-40R	Active Clamp Forward	18	28	36	5.0	60	240	PDF	—	—	PQL2050-4R9-14
20N1-0606-40R	Active Clamp Forward	18	28	36	12.0	60	240	PDF	—	—	PQi2050-20-HX
20N1-0612-40R	Active Clamp Forward	18	28	36	24.0	60	240	PDF	—	—	PQi2050-100-6-LTC
20N1-0302	Active Clamp Forward	9	12	32	3.3	60	240	PDF	—	—	PQL2050-3R3-22
20N1-0303	Active Clamp Forward	9	12	32	5.0	60	240	PDF	—	—	PQL2050-4R9-14
20N1-0306	Active Clamp Forward	9	12	32	12.0	60	240	PDF	—	—	PQi2050-20-HX
20N1-0312	Active Clamp Forward	9	12	32	24.0	60	240	PDF	—	—	PQi2050-100-6-LTC

Download Data Sheet (PDF)

Mechanical outline & package dimensions

Length	L	21.0
Width	W	17.8
Height	H	7.0
Weight (approx.)		10 g
Tolerances		±0.78 mm unless noted
Finish		RoHS · Cu leads · Sn/Ag 96/4

Notes

The 20N1 series is designed for opto-isolated Active Clamp Forward circuits as described by the LT3753 controller (Analog Devices).
Secondary-side synchronous-rectifier FETs are typically controlled by the LT8311 secondary-side IC. Direct drive through the secondary winding is ideal for a 2:1 input range.
The 20N1 series can also operate over a wider input range, or be configured for different input/output voltages and rated power. Increased height allows higher output power through higher current capability.
Integer turns from 1T to 16T are available; windings can be used as primary or secondary. The mechanical outline allows a “flex” arrangement. Contact the factory for any power-topology design.
All designs can be supplied with planar windings embedded in the PCB of the converter main module. Heatsink, installed power components, SMT assembly and module integration are also available.
Operating temperature = ambient + temperature rise; must not exceed the insulation-class limit.
Contact applications engineering for custom variants.