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BD9P105MUF-CE2 Folha de dados(PDF) 25 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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© 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
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 BD9P105MUF-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 BD9P135MUF-C and BD9P155MUF-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 (BD9P105MUF-C)


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