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Transcript
BD91361MUV Datasheet 2. Description of Functions (1) Soft-Start Function During start-up, the soft-start circuit gradually establishes the output voltage to limit the input current. This prevents the overshoot in the output voltage and inrush current. (2) Shutdown Function When EN terminal is set to âLowâ, the device operates in Standby Mode, and all the functional blocks such as reference voltage circuit, internal oscillator and drivers are turned to OFF. Circuit current during standby is 0µA (Typ). (3) UVLO Function This circuit detects whether the supplied input voltage is sufficient to provide the output voltage of this IC. A hysteresis width of 50mV (Typ) is provided to prevent the output from chattering. Hysteresis 50mV VCC EN VOUT tSS tSS tSS Soft start Standby Mode Operating Mode Standby Mode Operating Mode UVLO UVLO Standby Mode Operating Mode EN Standby Mode UVLO Figure 24. Soft-Start, Shutdown, UVLO Timing Chart (4) Short-Circuit Protection with Time Delay Function To protect the IC from breakdown, the short-circuit turns the output OFF when the internal current limiter is activated continuously for a fixed time (tLATCH) or more. The output that is kept OFF may be turned ON again by restarting EN or by resetting UVLO. EN 1msec VOUT Output Current in non-control 1/2VOUT Until output voltage goes up the half of VO or over, timer latch is not operated. (No timer latch, only limit to the output current) Limit Output voltage OFF Latch IL Output Current in control by limit value (With fall of the output voltage, limit value goes down) Standby Mode Operated Mode Operated Mode Standby Mode EN Timer Latch EN Figure 25. Short-Circuit Protection with Time Delay Diagram www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111ï½¥15ï½¥001 10/23 TSZ02201-0J3J0AJ00200-1-2 06.Oct.2014 Rev.002
