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TPS54328 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS54328 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 29 page 10 TPS54328 SLVSAN2D – NOVEMBER 2010 – REVISED AUGUST 2016 www.ti.com Product Folder Links: TPS54328 Submit Documentation Feedback Copyright © 2010–2016, Texas Instruments Incorporated Feature Description (continued) cycle begins. In subsequent switching cycles, the on-time is set to a fixed value and the current is monitored in the same manner. If the over current condition exists for 7 consecutive switching cycles, the internal OCL threshold is set to a lower level, reducing the available output current. When a switching cycle occurs where the switch current is not above the lower OCL threshold, the counter is reset and the OCL limit is returned to the higher value. There are some important considerations for this type of over-current protection. The load current one half of the peak-to-peak inductor current higher than the over-current threshold. Also when the current is being limited, the output voltage tends to fall as the demanded load current may be higher than the current available from the converter. This may cause the output voltage to fall. When the over current condition is removed, the output voltage returns to the regulated value. This protection is non-latching. 7.3.6 UVLO Protection Undervoltage lock out protection (UVLO) monitors the voltage of the VREG5 pin. When the VREG5 voltage is lower than UVLO threshold voltage, the TPS54328 is shut off. This protection is non-latching. 7.3.7 Thermal Shutdown TPS54328 monitors the temperature of itself. If the temperature exceeds the threshold value (typically 165°C), the device is shut off. This is non-latch protection. 7.4 Device Functional Modes 7.4.1 Normal Operation When the input voltage is above the UVLO threshold and the EN voltage is above the enable threshold, the TPS54328 can operate in the normal switching modes. Normal continuous conduction mode (CCM) occurs when the minimum switch current is above 0 A. In CCM, the TPS54328 operates at a quasi-fixed frequency of 700 kHz. 7.4.2 Standby Operation When the device is operating in either normal CCM or forced CCM, it may be placed in standby operation mode by asserting the EN pin low. |
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