Planar switch-mode transformers
- Technology
- Switch-mode transformers
- Partner
- Champs Technologies
Planar transformers are suitable in applications where designers need compactness and very low height over printed circuit boards (PCB), typically DC/DC converter in brick size.
Windings are designed on multi-layer PCB which are arranged in panels and manufactured in the highest volume practicable allowing exact repeatability of leakage inductance and capacitance.
Core flat shape offers a wide surface to dissipate heat generated internally to the component. It is also possible to optimise core cross-section to reduce power losses.
Planar components are easily embedded into the PCB of the entire application, reducing manufacturing time and improving automation.
Range features
A high level overview of what this range offers
- Height: low profile
- Low leakage inductance
- Repeatable leakage inductance, capacitance
- Volumetric efficiency (small size)
- Low turns count improves Cu loss
- Optimised core cross-section lowers core loss
- Large core surface promotes heat transfer
- PCB construction yields the lowest Cu loss
- AC resistance and proximity Cu loss minimised
- Opportunity to embed planar into PCB module
- A wide base of standard products, reducing tooling needed
What’s in this range?
All the variants in the range and a comparison of what they offer
| Series | Vin range | Ref. ICs | Topology | Application |
|---|---|---|---|---|
168F1 | 9 – 36 | LT8302 | LT8304 | BCM flyback | POE | Bias |
20F1 | 9 – 72 | LT3748 | LT8302 | LT8304 | BCM flyback | POE | DC/DC |
20N1 | 9 – 72 | LT8304 | LT3753 | Active clamp forward | synchronous rectifier | DC/DC |
40R2 | 9 – 72 | LT1952 | – | DC/DC |
G45R2 | 9 – 72 | LT1952 | LT3765/66 | Forward active clamp | Telecom DC/DC |
G45AH2 | 18 – 72 | LT1952 | LT3753 | Forward active clamp | DC/DC |
P20F2 | 9 – 72 | LT3748 | LT8309 | No-Opto isolated BCM flyback | PoE | DC/DC |
P26R6 | 38 – 430 | LT3752 | LT8311 | Active clamp forward and wide input range | AC offline |
80R2 | 150 – 420 | DC1929A | Dual output active clamp forward | Offline |
P26F6 | 85 – 375 | LT3798 | BCM flyback | PFC offline |
CH13 | 60 – 400 | LT3752-1 | LT8311 | Flyback | Wide Vin offline |
PL58 | – | – | Forward w/ active or resonant reset | PSFB | LLC | asymmetrical half-bridge | Offline |
55R2 | – | – | Forward | PSFB | – |
