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BD9P1X5EFV-C 데이터시트(PDF) 25 Page - Rohm |
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BD9P1X5EFV-C 데이터시트(HTML) 25 Page - Rohm |
25 / 60 page 25/57 TSZ02201-0J1J0AL01480-1-2 © 2019 ROHM Co., Ltd. All rights reserved. 08.Apr.2020 Rev.002 www.rohm.com TSZ22111 • 15 • 001 BD9P1x5EFV-C Series Protect Function 1. Over Current Protection (OCP) The Over Current Protection (OCP) monitors the average inductor current. The OCP detection level can be selected by the OCP_SEL pin. When the OCP_SEL voltage is high, it is IOCP10 (1.250 A, Typ) and when the OCP_SEL voltage is low, it is IOCP05 (0.625 A, Typ). When the average inductor current exceeds to its setting value, the duty cycle of the switching is limited and the output voltage decreases. This protection circuit is effective in preventing damage due to sudden and unexpected incidents. However, the IC should never be used in applications where the protection circuit operates continuously (e.g. when a load that significantly exceeds the output current capability of the chip is connected). IOCP V OUT IOUT IL Figure 40. Over Current Protection 2. Short Circuit Protection (SCP) For BD9P105EFV-C, the Short Circuit Protection (SCP) block compares the FB pin voltage with the internal reference voltage VREF. When the FB pin voltage has decreased to VSCPL (0.64 V, Typ) or less and remained there for 0.9 ms (Typ), SCP stops the operation for 30 ms (Typ) and subsequently initiates a restart. If the FB pin voltage decreases to VSCPL (0.64 V, Typ) or less and increases to VSCPH (0.72 V, Typ) or more within 0.9 ms afterwards, SCP protection is released and output voltage recovers to normal operation. For BD9P135EFV-C and BD9P155EFV-C, the SCP block monitors the VOUT_SNS pin for the protection. SCP detection voltage VSCPL is 80 % (Typ) of normal output voltage. On the other hand, SCP release voltage VSCPH is 90 % (Typ) of normal output voltage. The SCP function is deactivated during 7 ms (Typ) from VOUT starting up. In addition, when VIN decreases and VOUT also decreases, the SCP function is deactivated not to detect short circuit protection. The SCP function is likewise deactivated when VIN voltage is lower than VSCP_DACT (133 %, Typ) of the VOUT_SNS pin voltage, and then is activated after 7 ms (Typ) from VIN voltage exceeds VSCP_DACT (133 %, Typ) of the VOUT_SNS pin voltage. Therefore, in the case of short circuit from VIN close to VOUT condition, SCP stops the switching operation after 7.9 ms (Typ) from short circuit. However, the device should never be used in applications characterized by continuous operation of the protection circuit (e.g. when a load that significantly exceeds the output current capability of the chip is connected). SCP Reset VFB VOUT x 133 % VOUT x 133 % VSCPL:0.64 V (Typ) 7 ms (Typ) 0.9 ms (Typ) 0.9 ms (Typ) 7 ms (Typ) 30 ms (Typ) VIN VOUT (Internal) HICCUP Delay Signal (Internal) SCP Mask Delay Signal OCP Threshold HiZ Inductor Current VSW VSCPH:0.72 V (Typ) SCP Reset 7 ms (Typ) 0.9 ms (Typ) HiZ 30 ms (Typ) Normal Over Load Normal Output Load Condition OCP Threshold 7.9 ms (Typ) 100 % 33 % 100 % 33 % Figure 41. Short Circuit Protection (SCP) Timing Chart (BD9P105EFV-C) |
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