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BM2P121XH-Z ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 24 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) 24 Page - Rohm

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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
Operational Notes
? continued
10.
Regarding the Input Pin of the IC
This IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated. P-N
junctions are formed at the intersection of the P layers with the N layers of other elements, creating a parasitic diode or
transistor. For example (refer to figure below):
When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode.
When GND > Pin B, the P-N junction operates as a parasitic transistor.
Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual
interference among circuits, operational faults, or physical damage. Therefore, conditions that cause these diodes to
operate, such as applying a voltage less than the GND voltage to an input pin (and thus to the P substrate) should be
avoided.
Figure 30. Example of IC Structure
11.
Ceramic Capacitor
When using a ceramic capacitor, determine a capacitance value considering the change of capacitance with
temperature and the decrease in nominal capacitance due to DC bias and others.
12.
Thermal Shutdown Circuit (TSD)
This IC has a built-in thermal shutdown circuit that prevents heat damage to the IC. Normal operation should always
be within the IC?s maximum junction temperature rating. If however the rating is exceeded for a continued period, the
junction temperature (Tj) will rise which will activate the TSD circuit that will turn OFF power output pins. When the Tj
falls below the TSD threshold, the circuits are automatically restored to normal operation.
Note that the TSD circuit operates in a situation that exceeds the absolute maximum ratings and therefore, under no
circumstances, should the TSD circuit be used in a set design or for any purpose other than protecting the IC from
heat damage.
13.
Over Current Protection Circuit (OCP)
This IC incorporates an integrated overcurrent protection circuit that is activated when the load is shorted. This
protection circuit is effective in preventing damage due to sudden and unexpected incidents. However, the IC should
not be used in applications characterized by continuous operation or transitioning of the protection circuit.
N
N
P
+
P
N
N
P
+
P Substrate
GND
N
P
+
N
N
P
+
N P
P Substrate
GND
GND
Parasitic
Elements
Pin A
Pin A
Pin B
Pin B
B
C
E
Parasitic
Elements
GND
Parasitic
Elements
C
B
E
Transistor (NPN)
Resistor
N Region
close-by
Parasitic
Elements


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