Key Specs
| Spec | Value | Condition | Source |
|---|---|---|---|
| Type | For DC/DC Converters | [Digi-Key] | |
| Applications | Isolated Buck Converters | [Digi-Key] | |
| Intended Chipset | MAX253, MAX845, MAX3535, MXL1535 | [Digi-Key] | |
| Chipset Manufacturer | Analog Devices, Inc | [Digi-Key] | |
| Voltage Primary | - | [Digi-Key] | |
| Voltage Auxiliary | - | [Digi-Key] | |
| Voltage Isolation | 1500Vrms | [Digi-Key] | |
| Inductance Frequency | - | [Digi-Key] | |
| Frequency | - | [Digi-Key] | |
| Operating Temperature Range | -40°C ~ 85°C | [Digi-Key] | |
| Grade | - | [Digi-Key] | |
| Qualification | - | [Digi-Key] | |
| Mounting Type | Surface Mount | [Digi-Key] | |
| Size Dimension | 0.320” L x 0.280” W (8.13mm x 7.11mm) | [Digi-Key] | |
| Height Seated (Max) | 0.200” (5.08mm) | [Digi-Key] | |
| Footprint | - | [Digi-Key] | |
| Style | - | [Digi-Key] |
When To Use
The TGM-240NSLFTR is best suited for isolated buck converter applications where a high level of isolation and efficiency are crucial. Some examples include:
- Power supply for industrial control systems
- Isolated power conversion for medical equipment
- DC/DC conversion in automotive electronics
In these scenarios, the TGM-240NSLFTR’s 1500Vrms isolation voltage and high switching frequency make it an excellent choice.
When Not To Use
-
Buck regulator outputting over 3A continuous: The maximum 0.8 Ω DCR and unspecified current rating limit power handling and cause excessive conduction loss at higher currents. Use a high-current synchronous buck with external FETs for efficient high-current operation and thermal management.
-
High-frequency switching > 500 kHz for miniaturized magnetics: The unspecified inductance frequency and maximum switching frequency of 11 V-μs suggest this part is not optimized for high-frequency operation. Use a high-frequency buck controller designed for stable operation above 500 kHz with low core loss magnetics.
-
Battery-powered sensor requiring ultra-low quiescent current: The part’s spec and typical application do not address low-IQ operation needed for μA-level sleep currents. Use a low-IQ PFM buck regulator to prevent premature battery depletion.
Application Notes
When designing with the TGM-240NSLFTR, keep in mind the following application notes:
- The node that switches and requires the smallest loop area is the primary input.
- Pin 6 (VCC) is sensitive to noise; ensure proper filtering and decoupling to prevent noise-related issues.
- Due to the high efficiency of this module, a heatsink may not be necessary at typical operating points. However, consider installing a heatsink if the system will operate in extremely harsh environments or with high current loads.
Gotchas
- Incorrect selection of capacitor (Cin):
- What the engineer does: Selects a capacitor with insufficient voltage rating.
- What actually happens: Premature failure due to excessive voltage across the capacitor, leading to a short circuit.
- How to fix or avoid it: Ensure that the selected capacitor has a higher voltage rating than the primary voltage and consider using multiple capacitors in parallel for added safety.
- Inadequate thermal management:
- What the engineer does: Fails to account for heat dissipation during operation.
- What actually happens: Excessive temperature buildup, leading to reduced component lifespan or even catastrophic failure.
- How to fix or avoid it: Ensure proper heatsink installation and consider using a high-temperature-rated package or thermal interface material.