This reference design provides isolated-bias supply and isolated-gate driver for power switches in traction inverters and onboard chargers. Both the bias power and driver provide the high isolation (3-kV RMS for one minute) needed for 800-VDC bus application. The isolated bias provides 24 VDC both the +15-V and -5-V gate-drive biases. The isolated driver provides the high currents (up to 30-A peak) needed to rapidly turn on and off these high-power switches and offers advanced protection features. PMP22817 also provides a tested DC/DC single-ended primary-inductor converter SEPIC off automotive battery voltage (6 V to 42 V including surge/dips) to provide the regulated 24 V.
This reference design was intended to be used with the UCC14240-Q1 device, and can be modified to operate using UCC14141-Q1 or UCC14341-Q1. The pre-regulator is designed to produce 24 V as input to the UCC14240-Q1 device, and would need to be adjusted for UCC14141-Q1 or UCC14341-Q1 target input voltage.
UCC14xxx-Q1 information:
| Output voltage options | PMP22817.1 | PMP22817.2 | PMP22817.3 |
|---|---|---|---|
| Vin (Min) (V) | 6 | 21 | 21 |
| Vin (Max) (V) | 42 | 27 | 27 |
| Vout (Nom) (V) | 24 | 15 | -5 |
| Iout (Max) (A) | .13 | .15 | .15 |
| Output Power (W) | 3.12 | 2.25 | .75 |
| Isolated/Non-Isolated | Non-Isolated | Isolated | Isolated |
| Input Type | DC | DC | DC |
| Topology | Sepic- CCM | Full Bridge- Phase Shifted | Full Bridge- Phase Shifted |
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| Test report | Automotive SPI Prog. Gate Driver & Bias Supply W/ Int. Transformer Ref. Design (Rev. A) | PDF | HTML | Mar. 29, 2022 |
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