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ACT4529M Scheda tecnica(PDF) 6 Page - Active-Semi, Inc |
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ACT4529M Scheda tecnica(HTML) 6 Page - Active-Semi, Inc |
6 / 15 page ACT4529M Rev 1, 23-Feb-17 Innovative PowerTM - 6 - www.active-semi.com Copyright © 2016-2017 Active-Semi, Inc. FUNCTIONAL BLOCK DIAGRAM FUNCTIONAL DESCRIPTION Output Current Sensing and Regulation Sense resistor is connected to CSP and CSN. The sensed differential voltage is compared with interval reference to regulate current. CC loop and CV loop are in parallel. The current loop response is allowed to have slower response compared to voltage loop. However, during current transient response, the inductor current overshoot/undershoot should be controlled within +/-25% to avoid inductor saturation. Cycle-by-Cycle Current Control The conventional cycle-by-cycle peak current mode is implemented with high-side FET current sense. Input Over Voltage Protection The converter is disabled if the input voltage is above 42V (+/-2V). Device resumes operation automatically 40ms after OVP is cleared. Output Over Voltage Protection Device stops switching when output over-voltage is sensed, and resumes operation automatically when output voltage drops to OVP- hysteresis. Output Over Voltage Discharge Discharge circuit starts to discharge output through CSP pins when output over voltage is detected. Discharge circuit brings 12V down to 5V in less than 100ms. Output Under-Voltage Protection / Hiccup Mode There is a under voltage protection (UVP) threshold. If the UVP threshold is hit for 10us, an over current or short circuit is assumed, and the converter goes into hiccup mode by disabling the converter and restarts after hiccup waiting period. Input Brownout Protection (ACT4529MYH-T1011 only) If the input voltage drops below 8V but higher than UVLO for 450ms while in QC or PDC mode, the output voltage turns off and QC or PDC mode is disabled. If the output voltage drops below 3.7V, the timer restarts and waits for 450ms before attempting to restart the output voltage. When output voltage rises above 3.9V and detects the input voltage below 8V, timer restarts. If the input voltage is below 8V after 450ms, the output turns off. The cycle continues until the input voltage increases above 8.2V,for longer than 450ms, then output turns on, the IC renegotiates the PD and QC protocols, and normal operation restarts. Thermal Shutdown If the TJ increases beyond 160°C, ACT4529 goes into HZ mode and the timer is preserved until TJ drops by 30°C. |
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