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LM25575 bảng dữ liệu(PDF) 11 Page - Texas Instruments

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tên linh kiện LM25575
Giải thích chi tiết về linh kiện  LM25575/LM25575-Q1 SIMPLE SWITCHER짰 42V, 1.5A Step-Down Switching Regulator
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SYNC
10k
S
R
Q
Q
DEADTIME
ONE-SHOT
5V
2.5V
I = f(RT)
SYNC
LM25575
UP TO 5 TOTAL
DEVICES
LM25575
SYNC
SYNC
AGND
LM25575
SW
CLK
SYNC
SW
500 ns
LM25575, LM25575-Q1
www.ti.com
SNVS479G – JANUARY 2007 – REVISED APRIL 2013
Figure 3. Sync from External Clock
Figure 4. Sync from Multiple Devices
Multiple LM25575 devices can be synchronized together simply by connecting the SYNC pins together. In this
configuration all of the devices will be synchronized to the highest frequency device. The diagram in Figure 5
illustrates the SYNC input/output features of the LM25575. The internal oscillator circuit drives the SYNC pin with
a strong pull-down / weak pull-up inverter. When the SYNC pin is pulled low either by the internal oscillator or an
external clock, the ramp cycle of the oscillator is terminated and a new oscillator cycle begins. Thus, if the SYNC
pins of several LM25575 IC’s are connected together, the IC with the highest internal clock frequency will pull the
connected SYNC pins low first and terminate the oscillator ramp cycles of the other IC’s. The LM25575 with the
highest programmed clock frequency will serve as the master and control the switching frequency of the all the
devices with lower oscillator frequency.
Figure 5. Simplified Oscillator Block Diagram and SYNC I/O Circuit
Copyright © 2007–2013, Texas Instruments Incorporated
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