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BD95242MUV Datasheet(PDF) 10 Page - Rohm |
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BD95242MUV Datasheet(HTML) 10 Page - Rohm |
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10 / 21 page  Technical Note 10/20 www.rohm.com 2009.04 - Rev.B © 2009 ROHM Co., Ltd. All rights reserved. ● Timing Chart • Soft Start Function ・ Timer Latch Type Short Circuit Protection ・ Over Voltage Protection ・ Over current protection circuit EN SS VOUT IIN TSS Soft start time Tss= REF×Css 2.5μA(typ) [sec] Incoming current IIN= Co×VOUT Tss [A] Soft start is exercised with the EN pin set high. Current control takes effect at startup, enabling a moderate output voltage “ramping start.” Soft start timing and incoming current are calculated with formulas (2) and (3) below. Short protection kicks in when output falls to or below REF × 1.4 (setting voltage ×0.7). When the programmed time period (typ.=1ms) elapses, output is latched OFF to prevent destruction of the IC. Output voltage can be restored either by reconnecting the EN pin or disabling UVLO. (Css: Soft start capacitor; Co: Output capacitor) ・・・ (2) ・・・ (3) VOUT SCP EN / UVLO REF×1.4 150μs(typ) or more 150μs(typ) or less 150μs(typ) Latch VOUT REF×2.35 OVP EN / UVLO When output rise to or above REF×2.35(output setting voltage ×1.175), output over voltage protection is exercised, and low side FET goes up maximum for reducing output.(LG=High, HG=Low). When output falls within the programmed time (typ=150μs), it returns to the standard mode. When the programmed time period elapses, output is latched OFF to prevent destruction of the IC. Output voltage can be restored either by reconnecting the EN pin or disabling UVLO. During the normal operation, when VOUT becomes less than reference voltage, HG becomes High during the time tON . However, when inductor current exceeds ILIMIT threshold, HG becomes OFF. After 2.5μsec(typ), HG becomes ON again if the output voltage is lower than the specific voltage level and IL is lower than ILIMIT level. 2.5μsec tON tON HG LG IL ILIMIT tON 2×REF increase Io Vo |
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