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參數資料
| 型號： | TPS62677YFDT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, PBGA6 |
| 封裝： | 0.40 MM HEIGHT, DSBGA-6 |
| 文件頁數： | 10/28頁 |
| 文件大小： | 750K |
| 代理商： | TPS62677YFDT |
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PFMModeatLightLoad
PFMRipple
PWMModeatHeavyLoad
NominalDCOutputVoltage
SLVS952 – APRIL 2010
www.ti.com
Figure 39. Operation in PFM Mode and Transfer to PWM Mode
MODE SELECTION
The MODE pin allows to select the operating mode of the device. Connecting this pin to GND enables the
automatic PWM and power-save mode operation. The converter operates in regulated frequency PWM mode at
moderate to heavy loads and in the PFM mode during light loads, which maintains high efficiency over a wide
load current range.
Pulling the MODE pin high forces the converter to operate in the PWM mode even at light load currents. The
advantage is that the converter modulates its switching frequency according to a spread spectrum PWM
modulation technique allowing simple filtering of the switching harmonics in noise-sensitive applications. In this
mode, the efficiency is lower compared to the power-save mode during light loads. Notice that the TPS62674
device only permits PWM operation and required the MODE input to be tied high.
For additional flexibility, it is possible to switch from power-save mode to PWM mode during operation. This
allows efficient power management by adjusting the operation of the converter to the specific system
requirements.
SPREAD SPECTRUM, PWM FREQUENCY DITHERING
The goal is to spread out the emitted RF energy over a larger frequency range so that the resulting EMI is similar
to white noise. The end result is a spectrum that is continuous and lower in peak amplitude, making it easier to
comply with electromagnetic interference (EMI) standards and with the power supply ripple requirements in
cellular and non-cellular wireless applications. Radio receivers are typically susceptible to narrowband noise that
is focused on specific frequencies.
Switching regulators can be particularly troublesome in applications where electromagnetic interference (EMI) is
a concern. Switching regulators operate on a cycle-by-cycle basis to transfer power to an output. In most cases,
the frequency of operation is either fixed or regulated, based on the output load. This method of conversion
creates large components of noise at the frequency of operation (fundamental) and multiples of the operating
frequency (harmonics).
The spread spectrum architecture varies the switching frequency by ca. ±10% of the nominal switching frequency
thereby significantly reducing the peak radiated and conducting noise on both the input and output supplies. The
frequency dithering scheme is modulated with a triangle profile and a modulation frequency fm.
18
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS6267x
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