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EA4527YH Datasheet(PDF) 6 Page - Active-Semi, Inc |
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EA4527YH Datasheet(HTML) 6 Page - Active-Semi, Inc |
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6 / 14 page  ACT4527 Rev 2, 06-Jan-2017 Innovative Power TM - 6 - www.active-semi.com Copyright © 2 0 1 5 -2017 Active-Semi, Inc. FUNCTIONAL BLOCK DIAGRAM PWM Controller Driver Current Sense and Control 70m Ω 4.7 Ω OVP CSP CSN GND SW HSB UVLO VIN PDC 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. Cord Compensation In some applications, the output voltage is increased with output current to compensate the potential voltage drop across output cable. The compensation is based on the high side feedback resistance. The compensation voltage is derived as: Ä Vout = (VCSP-VCSN)*K Where K=3.03 This voltage difference could be added on the reference or turning the (VCSP-VCSN) voltage into a sink current at FB pin to pull Vout higher than programmed voltage. The cord compensation loop should be very slow to avoid potential disturbance to the voltage loop. The voltage loop should be sufficiently stable on various cord compensation setting. Thermal Shutdown If the TJ increases beyond 160 ° C , A C T 4 5 2 7 g o e s into HZ mode and the timer is preserved until TJ drops by 30 ° C . |
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