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BD9P105MUF-CE2 Folha de dados(PDF) 28 Page - Rohm

Nome de Peças BD9P105MUF-CE2
Descrição Electrónicos  3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive
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Fabricante Electrônico  ROHM [Rohm]
Página de início  http://www.rohm.com
Logo ROHM - Rohm

BD9P105MUF-CE2 Folha de dados(HTML) 28 Page - Rohm

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© 2019 ROHM Co., Ltd. All rights reserved.
28.Apr.2020 Rev.001
www.rohm.com
TSZ22111 • 15 • 001
BD9P1x5MUF-C Series
TSZ02201-0J1J0AL01500-1-2
Protect Function – continued
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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