25 to 100W Planar Transformers
Description
Payton SIZE 25 provides a planar solution for low power applications (such as telecommunication) providing high efficiency, low EMI, excellent repeatability, low profile and weight with an operating temperature range of -40°C to +130°C.
Transformer Application
| POWER CAPACITY | DIMENSIONS (mm) | TYPICAL WEIGHT | DIELECTRIC ISOLATION | OPERATING VOLTAGE | OPERATING CURRENT (RMS) |
|---|---|---|---|---|---|
| 25W, flyback at 200 kHz 100W, full bridge at 800 kHz | L=20-23 W=19 H=4-10 | 7-10 gr. | Up to 1000 Vrms | 150 Vpeak max. | 25 A max. |
- Typical efficiency: 97-99%
- Recommended frequency range: 100 kHz - 2.5 MHz.
- Topologies (in order of preference): Full bridge; Half bridge; Push-Pull; Forward; Flyback; Boost; Buck; Resonant topologies.
- Mounting Options: a. Horizontal, b. Vertical
Inductor Application
| STANDARD AL(nH/t2) | 1000 | 630 | 400 | 315 | 160 | 100 |
|---|---|---|---|---|---|---|
| TYPICAL VALUE OF MAX. Amper Turns | 4 | 12 | 23 | 29 | 60 | 97 |
AL values not listed are available upon request.
Typical Thermal Impedance For Different Cooling Conditions
| NATURAL COOLING (Hot Spot - Air) | BLOWING AIR 3m/sec (Hot Spot-Air) | ONE SIDE HEATSINK (Hot Spot - Heatsink) | TWO SIDES HEATSINK (Hot Spot-Heatsink) |
|---|---|---|---|
| 40 °C/W | 25 °C/W | 15 °C/W | 8 °C/W |
EXAMPLE: Transformer Type T25 DC P.N. 17536
This T25-9-14C-6C, miniature planar transformer, natural cooled is developed for a low power DC-DC converter and may be used in telecommunication equipment, providing the following specifications:
| Transformer Specifications | Value |
|---|---|
| Total output power | 60 W (±12 [email protected] Adc; 5 Vdc@9 Adc; -5 [email protected] Adc) |
| Operating frequency | 320 kHz |
| Input voltage range | 36-72 Vdc |
| Topology | Forward |
| Max. Volt-Sec. product | 49 V- µSec |
| Duty cycle | 0.45 max. |
| Primary current | 2.85 Arms max. 4.2 Arms max. |
| Primary to half Sec. 1 ratio | 9:7 |
| Primary to half Sec. 1 ratio / Primary to half Sec. 1 ratio | 9:3 / 9:3 |
| Dielectric strength pri. to sec.+core | 1000 Vdc |
| sec. to core | 500 Vdc |
| sec. to sec. | 500 Vdc |
| Ambient temperature | -40 °C to +85 °C |
| Total losses (natural cooling) | 1.2W |
| Hot spot temperature (natural cooling) | 125 °C max. |
| Weight | 8 gr. |
