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BD9409F Datasheet(PDF) 25 Page - Rohm |
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BD9409F Datasheet(HTML) 25 Page - Rohm |
25 / 37 page 25/33 © 2016 ROHM Co., Ltd. All rights reserved. 01.Nov.2016 Rev.001 www.rohm.com TSZ22111・15・001 BD9409F TSZ02201-0T2T0C100230-1-2 3.5.5 OVP Detection MS PWM 3.0V 2.8V 3.0V 2.8V 3.0V 2.8V Abnormal COUNTER OVP SS GATE DIMOUT Less than Gate 4count Gate 4count Less than Gate 4count NORMAL OVP NORMAL abnormal NORMAL OVP NORMAL STATE OVP abnormal abnormal 0.4V FAIL REG90 AUTO COUNTER 131072 count Latch off and AUTO COUNTER (*1) (*2) (*3) (*4) (*5) (*6) (*7) STB Figure 34. OVP Detection (*1)…As OVP is detected, the output GATE=L, DIMOUT=L, and the abnormal counter starts. (*2)…If OVP is released within 4 clocks of abnormal counter of the GATE pin frequency, the boost operation restarts. (*3)…As the OVP is detected again, the boost operation is stopped. (*4)…As the OVP detection continues up to 4 count by the abnormal counter, IC will be latched off. After latched off, auto counter starts counting. (*5)… Once IC is latched off, the boost operation doesn't restart even if OVP is released. (*6)…When auto counter reaches 131072clk (217clk), IC will be auto-restarted. The auto restart interval can be calculated by the external resistor of RT pin. (Please refer to the section 3.2.7.) (*7)…The operation of the OVP detection is not related to the logic of PWM. |
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