Datasheet 3D Model

HA3994-AL Flyback Transformer

for LT3751

Developed for Linear Technology LT3751 Capacitor Charger Controller

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Count	Unit price
1	$4.99
240	$4.29
480	$3.71
1200	$3.24
2400	$2.78
4800	$2.54

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Typical Application

Works with Analog Devices LT3751

Input Voltage	Output			Fsw
Input Voltage	Sec1	Sec2	Sec3	Fsw
5 V — 24 V	5 V , 3.6 A	15 V , 1.2 A	-15 V , 1.2 A	100 kHz

Specifications

Electrical specifications at 25°C.

Part number (Hover for schematics)	Inductance at 0A (µH) 1 (Tolerance: ±10%)	Inductance min at 5 A (µH)	DCR max 2				Leakage Inductance max (µH) 3	Turns Ratio 4	Volt-time product (V-µs)	Isolation Voltage (Vrms) 5
Part number (Hover for schematics)	Inductance at 0A (µH) 1 (Tolerance: ±10%)	Inductance min at 5 A (µH)	Pri (Ω)	Sec1 (mΩ)	Sec2 (mΩ)	Sec3 (mΩ)	Leakage Inductance max (µH) 3	Pri : Sec1 : Sec2 : Sec3	Volt-time product (V-µs)	Isolation Voltage (Vrms) 5
HA3994-AL	7.50	6.75	0.018	20.000	31.000	31.000	0.22	1 : 0.5 : 1.5 : 1.5	37.5	1500

Notes

Inductance is measured at 100 kHz, 0.1 Vrms.
DCR for the primary is with the windings connected in parallel.
Leakage inductance is for both windings of the primary with the secondary windings shorted.
Turns ratios are with the primary windings connected in parallel.
1500 Vrms, one minute isolation from primary to secondary windings.

Termination:

RoHS-compliant. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations. Other terminations available at additional cost.

Environmental

Environmental:

RoHS compliant

Ambient temperature range:

–40°C to +85°C

Storage temperature range:

Component: –40°C to +85°C.
Tray packaging: –40°C to +80°C

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:

25.0 g

Packaging:

24 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 with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf.

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