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BM2P121XH-Z データシート(PDF) 8 Page - Rohm

部品番号 BM2P121XH-Z
部品情報  Non-isolated Type PWM DC/DC Converter IC Built-in Switching MOSFET
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メーカー  ROHM [Rohm]
ホームページ  http://www.rohm.com
Logo ROHM - Rohm

BM2P121XH-Z データシート(HTML) 8 Page - Rohm

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BM2P121XH-Z
TSZ02201-0F1F0A200560-1-2
17.Jan.2019 Rev.001
© 2018 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111
• 15 • 001
Description of Blocks
– continued
5
The VCC Pin Protection Function
This IC has the internal protection function at the VCC pin as shown below.
5.1
VCC UVLO/VCC OVP
VCC UVLO and VCC OVP are auto recovery type comparators that have voltage hysteresis. VCC OVP has an
internal mask time and its detection is performed if the condition that the VCC pin voltage is VOVP1 or more lasts for
tCOMP. The recovery requirement is the VCC pin voltage becomes less than VOVP2.
5.2
VCC Recharge Function
If the VCC pin voltage drops to less than VCHG1 after once the VCC pin becomes more than VUVLO1 and the IC
starts to operate, the VCC recharge function operates. At this time, the VCC pin is recharged from the DRAIN pin
through the startup circuit. When the VCC pin voltage becomes more than VCHG2, this recharge is stopped.
Figure 7. VCC UVLO/VCC OVP/VCC Recharge Function Timing Chart
A:
The input voltage is applied to the DRAIN pin and the VCC pin voltage rises.
B:
When the VCC pin voltage becomes higher than VUVLO1, the IC starts operating. And if the IC judges the other
protection functions as normal condition, it starts switching operation. The soft start function limits the over
current detection current value to prevent any excessive voltage or current rising. When the switching
operation starts, the output voltage rises.
C:
When the VCC pin voltage becomes more than VOVP1, VCC OVP timer operates.
D:
When the condition that the VCC pin voltage is more than VOVP1 lasts for tCOMP, the IC detects VCC OVP
function and stops switching operation.
E:
When the VCC pin voltage becomes less than VOVP2, VCC OVP is released and the switching operation
restarts.
F:
When the input power supply is turned OFF, the DRAIN pin voltage drops.
G: When the VCC pin voltage becomes less than VCHG1, the VCC recharge function is started.
H:
When the VCC pin voltage becomes more than VCHG2, the VCC recharge function is stopped.
I:
When the VCC pin voltage becomes less than VCHG1, the VCC recharge function is started. However, the
supply to the VCC pin decreases and the VCC pin voltage continues to drop because of the low DRAIN pin
voltage.
J:
When the VCC pin voltage becomes less than VUVLO2, VCC UVLO starts operating.
A
VCC UVLO
ON
VCC OVP
ON
ON
ON
VCC recharge
function
Voltage between
DRAIN pin and GND
VCHG2
VCHG1
VUVLO2
VUVLO1
Voltage between
VCC pin and GND_IC pin
VCNT
Voltage between
VOUT and GND
Switching
VOVP2
VOVP1
ON
ON
B
C D E
F
G H
I J
tCOMP
(Note 1)
(Note 1)
This GND dose n ot mean th e G ND_IC pin of the IC.
(Note 1)


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