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BD9P1X5EFV-C 데이터시트(PDF) 28 Page - Rohm |
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BD9P1X5EFV-C 데이터시트(HTML) 28 Page - Rohm |
28 / 60 page 28/57 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 5. Over Voltage Protection (OVP) This IC has Over Voltage Protection (OVP) monitoring FB to prevent the increase of output voltage in case of external injected current to VOUT. When FB voltage exceeds VOVPH (107.3 % of its setting voltage VFB1), the switching regulator sinks current from VOUT by changing state to PWM. The sink current during OVP is restricted to INCP (0.625 A, Typ) (OCP_SEL = L). In addition, the RESET pin is pulled down to GND during OVP detection. To prevent the malfunction by noise, the internal delay tRSTNFILT of 5 µs (Typ) is implemented after OVP detection. When FB voltage falls below VOVPL (104.7 % of its setting voltage VFB1), OVP function is released. The RESET pin is kept low and PWM switching is also kept during tRSTNACT (3.6 ms, Typ) after OVP function is released. When OCP_SEL is set high level, then INCP value is changed to INCP (1.250 A, Typ). If the FB pin is open, this IC cannot regulate VOUT correctly. In this case, if VOUT voltage exceeds VSNSOVPH or VCC_EX voltage exceed VEXOVPH, the VOUT is pulled down by PWM switching to protect internal devices same as the situation that the FB pin over voltage is detected. VOUT VOVPH VOVPL INCP tRSTNFILT tRSTNACT VFB VSW VRESET IL Figure 44. FB OVP Timing Chart VOUT VEXOVPH/VSNSOVPH VEXOVPL/VSNSOVPL tRSTNFILT INCP IOCP VFB VSW VRESET < tRSTNACT IL Figure 45. VCC_EX/VOUT_SNS OVP Timing Chart |
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