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LM3224 Datasheet(PDF) 3 Page - Texas Instruments |
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LM3224 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 26 page PWM COMP OVP COMP ERROR AMP UVP COMP LOGIC Drive UVP Reset OVP Set Reset Thermal SD Oscillator Duty Cycle Limit Load Current Measurement Driver Shutdown Comparator Thermal Shutdown Bandgap Voltage Reference + - - + BG - + BG + BG - SHDN VIN GND VC FSLCT ¦ SW FB SS LM3224 www.ti.com SNVS277B – DECEMBER 2004 – REVISED SEPTEMBER 2005 Block Diagram General Description The LM3224 utilizes a PWM control scheme to regulate the output voltage over all load conditions. The operation can best be understood referring to the block diagram and Figure 2 of the Operation section. At the start of each cycle, the oscillator sets the driver logic and turns on the NMOS power device conducting current through the inductor, cycle 1 of Figure 2 (a). During this cycle, the voltage at the VC pin controls the peak inductor current. The VC voltage will increase with larger loads and decrease with smaller. This voltage is compared with the summation of the SW voltage and the ramp compensation. The ramp compensation is used in PWM architectures to eliminate the sub-harmonic oscillations that occur during duty cycles greater than 50%. Once the summation of the ramp compensation and switch voltage equals the VC voltage, the PWM comparator resets the driver logic turning off the NMOS power device. The inductor current then flows through the schottky diode to the load and output capacitor, cycle 2 of Figure 2 (b). The NMOS power device is then set by the oscillator at the end of the period and current flows through the NMOS power device once again. The LM3224 has dedicated protection circuitry running during normal operation to protect the IC. The Thermal Shutdown circuitry turns off the NMOS power device when the die temperature reaches excessive levels. The UVP comparator protects the NMOS power device during supply power startup and shutdown to prevent operation at voltages less than the minimum input voltage. The OVP comparator is used to prevent the output voltage from rising at no loads allowing full PWM operation over all load conditions. The LM3224 also features a shutdown mode decreasing the supply current to 0.1µA (typ.). These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Copyright © 2004–2005, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM3224 |
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