TPS40090-Q1
- Qualified for Automotive Applications
- Two-, Three-, or Four-Phase Operation
- 5-V to 15-V Operating Range
- Programmable Switching Frequency Up to 1-MHz/Phase
- Current Mode Control With Forced Current Sharing(1)
- 1% Internal 0.7-V Reference
- Resistive Divider Set Output Voltage
- True Remote Sensing Differential Amplifier
- Resistive or DCR Current Sensing
- Current Sense Fault Protection
- Programmable Load Line
- Compatible with UCC37222 Predictive Gate Drive™ Technology Drivers
- 24-Pin Space-Saving TSSOP Package
- Binary Outputs
- APPLICATIONS
- Internet Servers
- Network Equipment
- Telecommunications Equipment
- DC Power Distributed Systems
(1) Patent pending
Predictive Gate Drive is a trademark of Texas Instruments.
The TPS40090 is a two-, three-, or four-phase programmable synchronous buck controller that is optimized for low-voltage, high-current applications powered by a 5-V to 15-V distributed supply. A multi-phase converter offers several advantages over a single power stage including lower current ripple on the input and output capacitors, faster transient response to load steps, improved power handling capabilities, and higher system efficiency.
Each phase can be operated at a switching frequency up to 1-MHz, resulting in an effective ripple frequency of up to 4-MHz at the input and the output in a four-phase application. A two-phase design operates 180° out of phase, a three-phase design operates 120° out of phase, and a four-phase design operates 90° out of phase, as shown in Figure 1.
The number of phases is programmed by connecting the deactivated phase PWM output to the output of the internal 5-V LDO. In two-phase operation the even phase outputs should be deactivated.
The TPS40090 uses fixed frequency, peak current mode control with forced phase current balancing. When compared to voltage mode control, current mode results in a simplified feedback network and reduced input line sensitivity. Phase current is sensed by using either current sense resistors installed in series with output inductors or, for improved efficiency, by using the DCR (direct current resistance) of the filter inductors. The latter method involves generation of a current proportional signal with an R-C circuit (shown in Figure 11).
The R-C values are selected by matching the time constants of the R-C circuit and the inductor; R-C = L/DCR. With either current sense method, the current signal is amplified and superimposed on the amplified voltage error signal to provide current mode PWM control.
An output voltage droop can be programmed to improve the transient window and reduce size of the output filter. Other features include a single voltage operation, a true differential sense amplifier, a programmable current limit, soft-start, and a power good indicator.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | High-Frequency Multiphase Controller. datasheet (Rev. C) | 2011年 5月 17日 | |
| White paper | Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) | PDF | HTML | 2024年 4月 30日 |
設計與開發
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TPS40090EVM-001 — TPS40090EVM-001 評估模組
The TPS40090EVM−001 multi-phase dc-to-dc converter utilizes the TPS40090 multi-phase controller and UCC27222 predictive gate driver to step down a 12-V input to 1.5-V at 420 kHz. The output current is 100 A. The TPS40090 provides fixed-frequency, peak current-mode control with forced-phase current (...)
| 封裝 | 引腳 | 下載 |
|---|---|---|
| TSSOP (PW) | 24 | 檢視選項 |
訂購與品質
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- MTBF/FIT 估算值
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- 進行中可靠性監測
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