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LM22670QMRX-5.0 데이터시트(PDF) 7 Page - Texas Instruments |
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LM22670QMRX-5.0 데이터시트(HTML) 7 Page - Texas Instruments |
7 / 29 page LOGIC OSC + - TYPE III COMP + - 1.285V & Soft-Start INT REG, EN,UVLO GND RT/SYNC SW BOOT VIN EN FB VIN VOUT Error Amp. PWM Cmp. Vcc ILimit LM22670 www.ti.com SNVS584O – SEPTEMBER 2008 – REVISED MARCH 2013 Simplified Block Diagram Figure 13. Simplified Block Diagram Detailed Operating Description The LM22670 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 5V and below. If an output voltage of 5V 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; 1.285V (typ.). The functional block diagram of the LM22670 is shown in Figure 13 . Copyright © 2008–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM22670 |
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