SN6507-Q1
SN6507-Q1 has an internal oscillator to set the switching frequency of the power stage. As the two power switches are out of phase, the oscillator frequency is twice of the actual switching frequency of each power switch. The duty cycle is fixed with 70 ns deadtime to avoid shoot-through. The duty cycle is changeable if duty cycle feature is enabled. Please refer to Section 8.3.3.
SN6507-Q1 has a wide switching frequency range from 100 kHz up to 2 MHz, which is pin-programmable through a resistor (RCLK) to GND. Below table lists the value of RCLK to achieve certain operating frequencies (fSW). The choice of switching frequency is a trade-off between power efficiency and size of capacitive and inductive components. For example, when operating at higher switching frequency, the size of the transformer and inductor is reduced, resulting in a smaller design footprint and lower cost. However, higher frequency increases switching losses and consequently degrades the overall power supply efficiency.
Figure 8-6 can also be used to estimate the programmable switching frequency, fSW, using an external resistor value, RCLK, where RCLK is in kΩ and fSW is in kHz:
If CLK pin is shorted to GND, the part switches at its default frequency, FSW. CLK pin floating is not a valid state of operation and will cause the part to stop switching until an external clock signal is present.
The SN6507 -Q1 is a high voltage, high frequency push-pull transformer driver providing isolated power in a small solution size. The device comes with the push-pull topology’s benefits of simplicity, low EMI, and flux cancellation to prevent transformer saturation. Further space savings are achieved through duty-cycle control, which reduces component count for wide-input ranges, and by selecting a high switching frequency, reducing the size of the transformer.
The device integrates a controller and two 0.5-A NMOS power switches that switch out of phase. Its input operating range is programmed with precision undervoltage lockouts. The device is protected from fault conditions by over-current protection (OCP), adjustable under-voltage lockout (UVLO), over voltage lockout (OVLO), thermal shutdown (TSD), and break-before-make circuitry.
The programmable Soft Start (SS) minimizes inrush currents and provides power supply sequencing for critical power up requirements. Spread Spectrum Clocking (SSC) and pin-configurable Slew Rate Control (SRC) further reduces radiated and conducted emissions for ultra-low EMI requirements.
The SN6507 -Q1 is available in a 10-pin HVSSOP DGQ package. The device operation is characterized for a temperature range from –55°C to 125°C.
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技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | SN6507-Q1 Low-Emissions, 36-V Push-Pull Transformer Driver with Duty Cyle Control for Isolated Power Supplies datasheet | PDF | HTML | 2021年 2月 15日 |
| Functional safety information | SN6507-Q1 Functional Safety FIT Rate, FMD and Pin FMA | PDF | HTML | 2022年 5月 16日 | |
| Application note | How to Reduce Emissions in Push-Pull Isolated Power Supplies (Rev. A) | PDF | HTML | 2021年 10月 5日 |
設計與開發
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SN6507DGQEVM — 適用於低放射、500-mA 推挽式隔離電源供應器的 SN6507 評估模組
SN6507DGQEVM 允許使用者在隔離電源供應器應用中評估 SN6507 推挽式隔離變壓器驅動器的性能和功能。
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
TINA-TI — 基於 SPICE 的類比模擬程式
| 封裝 | 引腳 | 下載 |
|---|---|---|
| HVSSOP (DGQ) | 10 | 檢視選項 |
訂購與品質
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