R41 PSFB — Data Sheet | Champs Technologies

Key features & specifications

TopologyPSFB — FWCT / Current Doubler

Power560–880 W (catalog groups)

Input20–35 · 43–53 · 350–410 V

Outputs7–16 V / up to 80 A

Freq.125–200 kHz

Package40.6 × 49.3 × 15.2 mm (R41)

Output inductorsPQI26 series matched

TurnsInteger 1T–40T

R41 planar transformers paired with PQI26 output inductors for phase-shift full-bridge current-doubler and FWCT converters — each group below lists transformer and output-inductor recommendations together.

Part number & parameter tables

All values at T_amb = 25 °C unless noted. TP = thermal pad, TH = thru-hole option.

Vin 20–35 V · 12 V / 60 A · 720 W · 200 kHz

Champs PN	Vin min	Vin max	Vout	Iout (A)	Pout (W)	Freq (kHz)	Ton (µs)	Half duty	Full duty
R41R6-0304-LF-TP-TH	20	35	12	60	720	200	2.32	46.4%	92.7%
R41R6-0203-LF-TP-TH	20	35	12	60	720	200	2.06	41.2%	84.2%

Vin 20–35 V · 12 V / 60 A · 720 W · 200 kHz — output inductor

Inductor PN	L (µH)	Toff max (µs)	Vpk sec (V)	Isec pk (A)	Ipri pk (A)	Isec rms (A)	Ripple (% Io)	Core loss (W)	Cu loss (W)
PQI26-3R-40-HX-TH	3.0	3.68	46.7	37.4	53	34.8	24.5	<1.0	5.0

Vin 43–53 V · 7 V / 80 A · 560 W · 125 kHz

Champs PN	Vin min	Vin max	Vout	Iout (A)	Pout (W)	Freq (kHz)	Ton (µs)	Half duty	Full duty
R41-0502-LF-TP-TH	43	53	7.0	80	560	125	3.35	41.9%	83.8%

Vin 43–53 V · 7 V / 80 A · 560 W · 125 kHz — output inductor

Inductor PN	L (µH)	Toff max (µs)	Vpk sec (V)	Isec pk (A)	Ipri pk (A)	Isec rms (A)	Ripple (% Io)	Core loss (W)	Cu loss (W)
PQI26-1R4-HX-TH	1.4	5.28	21.2	53.8	23.8	50	33	<1.0	2.8

Vin 350–410 V · 16 V / 55 A · 880 W · 125 kHz

Champs PN	Vin min	Vin max	Vout	Iout (A)	Pout (W)	Freq (kHz)	Ton (µs)	Half duty	Full duty
R41-180101-TP-TH	350	410	16.0	55	880	125	3.39	42.4%	84.8%

Vin 350–410 V · 16 V / 55 A · 880 W · 125 kHz — output inductor

Inductor PN	L (µH)	Toff max (µs)	Vpk sec (V)	Isec pk (A)	Ipri pk (A)	Isec rms (A)	Ripple (% Io)	Core loss (W)	Cu loss (W)
PQI26-4R7-36-HX-TH	4.7	5.10	45.6	36.4	5.7	32	30.9	3.0	2.0

Download Data Sheet (PDF)

Champs-Tech R41 PSFB — FWCT / Current Doubler · series datasheetCustom variants —

Mechanical outline & options

R41-180101 mechanical drawing & thru-hole layout

PQI26 output inductor mechanical drawing

General notes

Proven in actual PSFB to current-doubler and FWCT configured DC-DC converter applications.
In other applications the R41 PSFB series can operate over a wider input range or be configured for different input/output voltages and rated power. Increased height allows increased output power through higher current capability.
Adding effective thermal conduction with thermal pads, in combination with heat sinks and clamps, allows higher power throughput at rated ambient and hot-spot temperatures.
Package: 40.6 mm wide × 49.3 mm long × 15.2 mm high.
Multilayer PCB winding optimization for lowest AC resistance and proximity-loss effect.
Integer turns from 1T to 40T 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.
A wide variety of part numbers, designs and turns ratios is kept in stock — if not listed, contact us.
Options: surface mount, thru-hole, pad-to-pad, thermal pad and embedded planar windings.