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LM5575QMHX/NOPB bảng dữ liệu(PDF) 11 Page - Texas Instruments |
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LM5575QMHX/NOPB bảng dữ liệu(HTML) 11 Page - Texas Instruments |
11 / 31 page 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 Submit Documentation Feedback 11 Product Folder Links: LM5575-Q1 |
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