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LM5574Q bảng dữ liệu(PDF) 10 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  SIMPLE SWITCHER짰 75V, 0.5A Step-Down Switching Regulator
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SYNC
LM5574
UP TO 5 TOTAL
DEVICES
LM5574
SYNC
SYNC
AGND
LM5574
SW
CLK
SYNC
SW
500 ns
RT =
- 580 x 10
-9
135 x 10
-12
F
1
LM5574
SNVS478E – JANUARY 2007 – REVISED MARCH 2009
www.ti.com
An external set-point voltage divider from VIN to GND can be used to set the operational input range of the
regulator. The divider must be designed such that the voltage at the SD pin will be greater than 1.225V when Vin
is in the desired operating range. The internal 5µA pull-up current source must be included in calculations of the
external set-point divider. Hysteresis of 0.1V is included for both the shutdown and standby thresholds. The SD
pin is internally clamped with a 1k
Ω resistor and an 8V zener clamp. The voltage at the SD pin should never
exceed 14V. If the voltage at the SD pin exceeds 8V, the bias current will increase at a rate of 1 mA/V.
The SD pin can also be used to implement various remote enable / disable functions. Pulling the SD pin below
the 0.7V threshold totally disables the controller. If the SD pin voltage is above 1.225V the regulator will be
operational.
Oscillator and Sync Capability
The LM5574 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 15ns.
Figure 4. Sync from External Clock
Figure 5. Sync from Multiple Devices
10
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Copyright © 2007–2009, Texas Instruments Incorporated
Product Folder Links: LM5574


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