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LM22677 数据表(PDF) 10 Page - Texas Instruments

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部件名 LM22677
功能描述  LM22677/-Q1 42-V, 5-A SIMPLE SWITCHER짰, Step-Down Voltage Regulator With Features
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM22677 数据表(HTML) 10 Page - Texas Instruments

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LM22677, LM22677-Q1
SNVS582O – SEPTEMBER 2008 – REVISED AUGUST 2015
www.ti.com
Feature Description (continued)
threshold of about 0.8 V. With the RT/SYNC pin open, the voltage floats above this threshold, and the mode is
set to run with the internal clock. With a frequency set resistor present, an internal reference holds the pin
voltage at 0.8 V; the resulting current sets the mode to allow the resistor to control the clock frequency. If the
external circuit forces the RT/SYNC pin to a voltage much greater or less than 0.8 V, the mode is set to allow
external synchronization. The mode is latched until either the EN or the input supply is cycled.
The choice of switching frequency is governed by several considerations. As an example, lower frequencies may
be desirable to reduce switching losses or improve duty cycle limits. Higher frequencies, or a specific frequency,
may be desirable to avoid problems with EMI or reduce the physical size of external components. The flexibility
of increasing the switching frequency above 500 kHz can also be used to operate outside a critical signal
frequency band for a given application. Keep in mind that the values of inductor and output capacitor cannot be
reduced dramatically, by operating above 500 kHz. This is true because the design of the internal loop
compensation restricts the range of these components.
Frequency synchronization requires some care. First the external clock frequency must be greater than the
internal clock frequency, and less than 1 MHz. The maximum internal switching frequency is specified in the
Electrical Characteristics table.
NOTE
The frequency adjust feature and the synchronization feature can not be used
simultaneously.
The synchronizing frequency must always be greater than the internal clock frequency. Secondly, the RT/SYNC
pin must see a valid high or low voltage, during start-up, in order for the regulator to go into the synchronizing
mode (see above). Also, the amplitude of the synchronizing pulses must comport with VSYNC levels found in the
Electrical Characteristics table. The regulator will synchronize on the rising edge of the external clock. If the
external clock is lost during normal operation, the regulator will revert to the 500 kHz (typical) internal clock.
If the frequency synchronization feature is used, current limit foldback is not operational (see the Current Limit
section for details).
Figure 12. Switching Frequency vs RT/SYNC Resistor
10
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Product Folder Links: LM22677 LM22677-Q1


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