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LM5575QMHX/NOPB bảng dữ liệu(PDF) 11 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM5575-Q1 Simple Switcher짰 75-V, 1.5-A Step-Down Switching Regulator
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RT =
- 580 x 10
-9
135 x 10
-12
F
1
VIN
VCC
Internal Enable Signal
9V
7V
5.25V
LM5575-Q1
www.ti.com
SNOSB23C – OCTOBER 2008 – REVISED DECEMBER 2014
Device Functional Modes (continued)
An auxiliary supply voltage can be applied to the VCC pin to reduce the IC power dissipation. If the auxiliary
voltage is greater than 7.3 V, the internal regulator will essentially shut off, reducing the IC power dissipation.
The VCC regulator series pass transistor includes a diode between VCC and VIN that should not be forward
biased in normal operation. Therefore the auxiliary VCC voltage should never exceed the VIN voltage.
In high-voltage applications, take care to ensure the VIN pin does not exceed the absolute maximum voltage
rating of 76 V. During line or load transients, voltage ringing on the VIN line that exceeds the Absolute Maximum
Ratings can damage the IC. Both careful PC board layout and the use of quality bypass capacitors located close
to the VIN and GND pins are essential.
Figure 9. VIN and VCC Sequencing
8.4.2 Oscillator and Sync Capability
The LM5575-Q1 oscillator frequency is set by a single external resistor connected between the RT pin and the
AGND pin. The RT resistor should be located very close to the device and connected directly to the pins of the IC
(RT and AGND).To set a desired oscillator frequency (F), the necessary value for the RT resistor can be
calculated from the following equation:
(1)
The SYNC pin can be used to synchronize the internal oscillator to an external clock. The external clock must be
of higher frequency than the free-running frequency set by the RT resistor. A clock circuit with an open-drain
output is the recommended interface from the external clock to the SYNC pin. The clock pulse duration should
be greater than 15 ns.
Copyright © 2008–2014, Texas Instruments Incorporated
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