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LM5574Q bảng dữ liệu(PDF) 10 Page - Texas Instruments |
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LM5574Q bảng dữ liệu(HTML) 10 Page - Texas Instruments |
10 / 28 page 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 Submit Documentation Feedback Copyright © 2007–2009, Texas Instruments Incorporated Product Folder Links: LM5574 |
Số phần tương tự - LM5574Q |
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Mô tả tương tự - LM5574Q |
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