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LM10692BRMYT Datasheet(PDF) 25 Page - Texas Instruments |
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LM10692BRMYT Datasheet(HTML) 25 Page - Texas Instruments |
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25 / 48 page  125 µs VOUT Set VOUT Soft-Start begins IL Full Current Limit Soft-Start over 125 µs 125 µs LM10692 www.ti.com SNVSA53 – JULY 2014 8.3.5 Low Power Operation When the output current is low, each converter operates in PFM with a hysteretic pattern to limit the amount of switching event to a minimum and keep the current consumption lower. Buck1 and Buck6 are programmed to operate in PWM mode all the time. This mode can be overridden by the user with specific I2C commands (Specification ensured by design. Not tested during production). However, the default programmed mode will be reloaded upon reset. 8.4 Device Functional Modes 8.4.1 Soft Start 8.4.1.1 Buck Mode During power-up or when EN_AON or EN_CPE is toggled high, the bucks will turn on following a three steps soft-start pattern. Each step lasts 125us and consist of a constant average inductor current. The output voltage rise in a set of ramps as the output capacitor is being charged. If the set output voltage is reached prior to all the steps being completed, the soft-start period will be over. After the 375us soft-start period has elapsed, the full current (limited by the OCP setting for that buck converter) is allowed into the inductor regardless of the state of the output voltage. Figure 29. Typical Soft-Start Pattern It is preferable to ensure that the output voltage will be reached before the Soft-Start period is over. If not, in-rush current spike might be observed on the input. That spike depends on input capacitor, output capacitor and output voltage but is typically 1A to 2A in magnitude. For higher output capacitances, the output voltage will rise more slowly. Also, for higher output voltage settings, the desired output voltage will be reached less quickly. Hence depending on the output voltage, the output capacitance might have to be limited if in-rush current is a concern. 8.4.1.2 Bypass Mode If Buck1 is programmed as a bypass mode, the gate of the internal High Side switch will be gradually increased to ensure a soft-start pattern. After the HS switch has fully turned ON, the internal PG signal will come up and the additional bypass switch between the input and the FB1 pin will turn-ON to help reduce the resistance and voltage drop across the switch. Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 25 Product Folder Links: LM10692 |
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