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LM5576QMHX/NOPB bảng dữ liệu(PDF) 9 Page - Texas Instruments |
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LM5576QMHX/NOPB bảng dữ liệu(HTML) 9 Page - Texas Instruments |
9 / 27 page SYNC LM5576 UP TO 5 TOTAL DEVICES LM5576 SYNC SYNC AGND LM5576 SW CLK SYNC SW 500 ns RT = - 580 x 10 -9 135 x 10 -12 F 1 LM5576Q0 www.ti.com SNOSB24B – OCTOBER 2008 – REVISED APRIL 2013 Shutdown / Standby The LM5576Q0 contains a dual level Shutdown (SD) circuit. When the SD pin voltage is below 0.7V, the regulator is in a low current shutdown mode. When the SD pin voltage is greater than 0.7V but less than 1.225V, the regulator is in standby mode. In standby mode the Vcc regulator is active but the output switch is disabled. When the SD pin voltage exceeds 1.225V, the output switch is enabled and normal operation begins. An internal 5µA pull-up current source configures the regulator to be fully operational if the SD pin is left open. 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 LM5576Q0 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 11. Sync from External Clock Figure 12. Sync from Multiple Devices Copyright © 2008–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM5576Q0 |
Số phần tương tự - LM5576QMHX/NOPB |
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Mô tả tương tự - LM5576QMHX/NOPB |
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