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LM22679 Scheda tecnica(PDF) 8 Page - Texas Instruments |
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LM22679 Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 27 page LOGIC OSC + - TYPE III COMP + - 1.285V & Soft-start INT REG, EN, UVLO GND SW BOOT VIN IADJ FB VIN VOUT Error Amp. PWM Cmp. Vcc ILimit SS LM22679, LM22679-Q1 SNVS581L – FEBRUARY 2013 – REVISED NOVEMBER 2014 www.ti.com 7 Detailed Description 7.1 Overview The LM22679 incorporates a voltage mode constant frequency PWM architecture. In addition, input voltage feed- forward is used to stabilize the loop gain against variations in input voltage. This allows the loop compensation to be optimized for transient performance. The power MOSFET, in conjunction with the diode, produce a rectangular waveform at the switch pin, that swings from about zero volts to VIN. The inductor and output capacitor average this waveform to become the regulator output voltage. By adjusting the duty cycle of this waveform, the output voltage can be controlled. The error amplifier compares the output voltage with the internal reference and adjusts the duty cycle to regulate the output at the desired value. The internal loop compensation of the -ADJ option is optimized for outputs of 5 V and below. If an output voltage of 5 V or greater is required, the -5.0 option can be used with an external voltage divider. The minimum output voltage is equal to the reference voltage, that is, 1.285 V (typ). 7.2 Functional Block Diagram 8 Submit Documentation Feedback Copyright © 2013–2014, Texas Instruments Incorporated Product Folder Links: LM22679 LM22679-Q1 |
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