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15A Low Profile EQ40 High Frequency LLC Planar Transformer For DC-DC Converter
Place of Origin:
China
Brand Name:
Chipsen
Certification:
ISO9001:2015, ISO14001:2015, IATF16949, UL/cUL, ROHS, REACH, CQC
Model Number:
EQ40
Minimum Order Quantity:
100pcs
Price:
US$0.60-1.5
Packaging Details:
Carton 1: 25.5 X 21.5 X 21cm. Carton 2: 43.5 x 24.5 x 21 cm
Delivery Time:
3~4 Weeks
Payment Terms:
T/T
Supply Ability:
10,000,000pcs/month
Inquiry Now
Get A Quote
Specifications
Highlight Features
15A planar transformer
,EQ40 planar transformer
,DC Converter high power planar transformer
Core Material:
MnZn Ferrite — PC40 (PC44 / DMR44 Optional)
Operating Frequency:
20 KHz – 150 KHz (typical)
Output Power Range:
100 W – 300 W (topology Dependent)
Bobbin & Pin Configuration:
Vertical 6+6 Pins; Bobbin 45.4 × 36.8 × 19.8 Mm, Pin Pitch 5.0 Mm, Parallel Distance 39.0 Mm For Reference
Input / Output Voltage:
Input AC 110 V / 220 V; Output 5 V / 12 V / 24 V / 48 V (customizable)
Insulation Class:
Class B (130 °C) / Class F (155 °C)
Withstand Voltage:
Hi-Pot 3000 VAC / 1 Min
Wire Type:
Enameled Copper Wire / TIW (Triple Insulated Wire) / Litz Wire
Certification & Compliance:
RoHS & REACH Compliant; UL / VDE Recognized Materials; ISO 9001 / IATF 16949
Application:
Smart Home Power System, SMPS, LED Driver, DC Fast Charging, AI Rack Power, PV Inverter, OBC, UPS
Product Description
15A Low Profile EQ40 High Frequency LLC Planar Transformer for DC DC Converter
Product Overview
The EQ40 High Frequency LLC Planar Transformer is a low-profile, 15A high-current magnetic component engineered for DC-DC converters and LLC resonant topologies. Built on an EQ40 ferrite core with copper foil windings instead of conventional round magnet wire, this planar transformer delivers a flat, space-saving profile with excellent thermal performance — ideal for power designs where board height is the most constrained dimension.
Manufactured under a UL Recognized file (No. E332338), each unit features a shielded metal housing and epoxy potting at the base for mechanical stability, EMI suppression and vibration resistance.
Key Features
| Feature | Benefit to Your Design |
|---|---|
| Copper Foil Winding | Lower AC resistance, reduced skin and proximity effect at high frequency; higher current density in a smaller footprint |
| Low Profile Planar Structure | Fits 1U power shelves, slim adapters and high-density DC-DC modules where height is limited |
| EQ40 Ferrite Core | Larger effective cross-section than EQ28 / EQ33 — supports higher throughput power with stable inductance |
| Optimized for LLC Topology | Controlled leakage and magnetizing inductance for soft-switching (ZVS) efficiency |
| Shielded Metal Housing | Suppresses EMI radiation and improves thermal dissipation |
| Epoxy Potting Base | Protects terminations against vibration, moisture and mechanical shock |
| UL Recognized (E332338) | Verifiable file number that simplifies your end-product safety approval in North America |
| PCB Through-Hole Flat Pins | Robust mechanical mounting and low contact resistance for high-current paths |
Technical Specifications
| Parameter | Specification |
|---|---|
| Model No. | MTEQ40-450-17235 |
| Core Type | EQ40 |
| Core Material | MnZn Ferrite |
| Winding Type | Copper Foil |
| Rated Current | 15 A |
| Operating Frequency | 100 kHz ~ 500 kHz |
| Output Power | Customised |
| Primary Inductance (Lp) | Customised |
| Leakage Inductance (Lk) | Customised |
| Turns Ratio | Customised |
| DC Resistance (DCR) | Customised |
| Hi-Pot (Withstand Voltage) | Customised |
| Insulation Class | Class B / F / H |
| Operating Temperature | -40 °C ~ +125 °C |
| Dimensions (L * W * H) | Customised |
| Mounting Type | PCB Through Hole |
| Certification | UL Recognized Component, File No. E332338; RoHS Compliant |
| Customization | Turns ratio, inductance, pin configuration and housing available to your drawing |
Applications
- DC-DC converters and isolated power modules
- LLC resonant and phase-shift full-bridge power supplies
- Server power supplies and AI rack power systems
- EV on-board chargers (OBC) and DC fast charging
- Photovoltaic (PV) inverters and energy storage systems
- Telecom rectifiers and industrial SMPS
- LED drivers and high-density adapters
Why Choose Us
- UL Recognized manufacturing (File No. E332338) — a verifiable file number, not a vague claim.
- Full customization — send us your schematic, turns ratio, inductance and pin-out; we build to your drawing.
- 100% electrical testing before shipment: inductance, turns ratio, DCR and Hi-Pot.
- Sample support — small-batch prototyping available before mass production.
- Engineering feedback — our team reviews your LLC parameters and advises on core and winding trade-offs.
FAQ
Q1: Can the turns ratio and inductance be customized?
Yes. Turns ratio, primary and leakage inductance, pin configuration and housing can all be built to your specification. Please provide your drawing or converter parameters.
Q2: What is the advantage of copper foil over conventional magnet wire?
Copper foil reduces AC resistance caused by skin and proximity effects at high frequency, allowing higher current handling in a lower-profile package with better heat spreading.
Q3: Why choose a planar transformer for an LLC converter?
Planar construction gives highly repeatable leakage inductance from unit to unit, which is critical for LLC resonant tanks, while the low profile suits high-density board layouts.
Q4: Is the UL file number verifiable?
Yes. This transformer is produced under UL File No. E332338, which can be checked directly in the UL online certification directory.
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