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BM2P121XH-Z ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 11 Page - Rohm

๋ถ€ํ’ˆ๋ช… BM2P121XH-Z
์ƒ์„ธ๋‚ด์šฉ  Non-isolated Type PWM DC/DC Converter IC Built-in Switching MOSFET
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BM2P121XH-Z ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 11 Page - Rohm

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11/27
BM2P121XH-Z
TSZ02201-0F1F0A200560-1-2
17.Jan.2019 Rev.001
ฉ 2018 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111
? 15 ? 001
6
DC/DC Driver
? continued
6.4
Over Current Detection Function
This IC has a built-in over current detection function per switching cycle. This function stops the switching
operation if the coil current IL becomes IPEAK or more. Additionally, an internal current detection resistor contributes
to the reduction of parts and improvement of efficiency. The peak current which the IC switches to the overload
mode is determined by the formula below.
???????????????? ???????????????????????????? = ???????????????????? +
(???????????????????????? ? ????????????????)
????
ื ????????????????????????
Where:
???????????????????? is the over current detection current.
???????????????????????? is the DRAIN pin voltage.
????????????????
is the output voltage.
????
is the coil value.
???????????????????????? is the delay time after a detection of over current.
6.5
Dynamic Over Current Detection Function
This IC has a built-in dynamic over current detection function.
In the case that the coil current IL exceeds IDPEAK two times consecutively, it stops the switching operation for
tDPEAK.
Figure 12. Dynamic Over Current Limiter
IL
IDPEAK
2 counts
tDPEAK
1
2
Switching
ON
OFF
ON
[A]


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