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參數資料
| 型號： | TPS62677YFDT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PBGA6 |
| 封裝： | 0.40 MM HEIGHT, DSBGA-6 |
| 文件頁數： | 11/28頁 |
| 文件大?。?/td> | 750K |
| 代理商： | TPS62677YFDT |
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www.ti.com
SLVS952 – APRIL 2010
Figure 40. Spectrum of a Frequency Modulated
Figure 41. Spread Bands of Harmonics in
Sin. Wave with Sinusoidal Variation in Time
Modulated Square Signals
The above figures show that after modulation the sideband harmonic is attenuated compared to the
non-modulated harmonic, and the harmonic energy is spread into a certain frequency band. The higher the
modulation index (mf) the larger the attenuation.
(1)
With:
fc is the carrier frequency
fm is the modulating frequency (approx. 0.008*fc)
d is the modulation ratio (approx 0.1)
(2)
The maximum switching frequency fc is limited by the process and finally the parameter modulation ratio (d),
together with fm , which is the side-band harmonics bandwidth around the carrier frequency fc . The bandwidth of
a frequency modulated waveform is approximately given by the Carson’s rule and can be summarized as:
(3)
fm < RBW: The receiver is not able to distinguish individual side-band harmonics, so, several harmonics are
added in the input filter and the measured value is higher than expected in theoretical calculations.
fm > RBW: The receiver is able to properly measure each individual side-band harmonic separately, so the
measurements match with the theoretical calculations.
ENABLE
The TPS6267x device starts operation when EN is set high and starts up with the soft start as previously
described. For proper operation, the EN pin must be terminated and must not be left floating.
Pulling the EN pin low forces the device into shutdown, with a shutdown quiescent current of typically 0.1mA. In
this mode, the P and N-channel MOSFETs are turned off, the internal resistor feedback divider is disconnected,
and the entire internal-control circuitry is switched off. The TPS6267x device can actively discharge the output
capacitor when it turns off. The integrated discharge resistor has a typical resistance of 100
. The required time
to discharge the output capacitor at the output node depends on load current and the output capacitance value.
When an external clock signal (EXTCLK), 4MHz to 27MHz is applied to the TPS62674, the DC/DC converter
powers-up automatically within approx. 120ms. When the external clock signal is stopped, the DC/DC converter is
powered down and the output capacitor is discharged actively.
Copyright 2010, Texas Instruments Incorporated
19
Product Folder Link(s): TPS6267x
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| TPS62690EVM-076 | 功能描述:電源管理IC開發(fā)工具 TPS62690 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS62690YFFR | 功能描述:直流/直流開關轉換器 500mA,4MHz,2.85Vout Hi-Eff St-Dwn Cnvrtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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