3D Model Datasheet

RA7040-AL Forward Mode

Planar Transformer for TI UCC2897 (PMP9720)

Developed for TI UCC2897 Current Mode Active Clamp PWM Controller (PMP9720 reference design)
Designed for forward topology operating at 200 kHz with an input range of 48 – 60 V.

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Typical Application

Works with Texas Instruments UCC2897

Input Voltage	Output 1		Power
Input Voltage	Sec	Aux	Power
48 V — 60 V	12 V , 13 A	12 V	150 W

Specifications

Electrical specifications at 25°C.

Part number (Hover for schematics)	Inductance at 0A (µH) 2 (Tolerance: ±20%)	DCR max (mΩ) 3			Leakage Inductance max (µH) 4	Turns Ratio	Volt-time product (V-µs) 5	Isolation Voltage (Vrms) 6
Part number (Hover for schematics)	Inductance at 0A (µH) 2 (Tolerance: ±20%)	Pri	Sec	Aux	Leakage Inductance max (µH) 4	Pri : Sec : Aux	Volt-time product (V-µs) 5	Isolation Voltage (Vrms) 6
RA7040-AL	50	10.75	4.25	61.10	0.55	1 : 0.5 : 0.5	100	1500

Notes

Output is of the secondary winding frmo pins 11 – 8. Output of the aux winding is 12 V.
Inductance is for the primary, measured on Agilent/HP 4284A at 200 kHz, 0.5 Vrms, 0 Adc with primary windings connected in parallel.
DCR for the primary is measured with the windings connected in parallel. DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
Leakage Inductance is for the primary, measured at 200 kHz, 0.5 Vrms, 0 Adc with primary windings connected in parallel and all secondary pins shorted.
Volt-time product is based on primary windings connected in parallel.
1500 Vrms, one minute isolation hipot) from primary to secondary.

Termination:

RoHS-compliant 260°C compatible. Matte tin over nickel over brass.

Environmental

Environmental:

RoHS compliant

Ambient temperature range:

–40°C to +125°C

Storage temperature range:

Component: –40°C to +125°C
Tray packaging: –40°C to +80°C

Maximum part temperature:

+165°C (ambient + temp rise)

Failures in Time (FIT) / Mean Time Between Failures (MTBF):

See FIT/MTBF Calculations

Schematics

Primary windings to be connected in parallel on the PC board.

Physical characteristics

General specification

Core Material:

Ferrite

Weight:

12.7 g

Packaging:

36 per tray

Soldering/Washing

Moisture Sensitivity Level (MSL):

1 (unlimited floor life at <30°C / 85% relative humidity)

Resistance to soldering heat:

Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles

Refer to Soldering Coilcraft Components before soldering.

PCB Washing:

Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info

RA7040-AL Forward Mode

Planar Transformer for TI UCC2897 (PMP9720)

Typical Application

Specifications

Termination:

Schematics

Physical characteristics

General specification

Soldering/Washing

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RA7040-AL Forward Mode

Planar Transformer for TI UCC2897 (PMP9720)

Selected configuration not available

Typical Application

Specifications

Termination:

Schematics

Physical characteristics

General specification

Soldering/Washing

Related product series

Magnetics

B0860-CL Planar Transformer

C1539-AL Planar Transformer

DA2025-AL Planar Transformer

HA3648-BL Planar Transformer

HA4000-AL Planar Transformer

JA4309 Planar Transformer

Magnetics for

B0853-AL SMT Planar Transformer

A9786-AL Planar Magnetics

MA5519-AL Planar Transformer

NA5738-DL SMT Planar Transformer

NA5871-AL 800 W Planar Transformer

PA6605-AL Planar Transformer

PL140 Series

PL160 Series

PL300 Series

RA6992-BL SMT Planar Transformer

RA6998 Forward Mode Planar Transformer

RA6999-AL Forward Mode Transformer

YA9215-AL 50 W Resonant Transformer

Warning