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BM2P121XH-Z データシート(PDF) 8 Page - Rohm |
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BM2P121XH-Z データシート(HTML) 8 Page - Rohm |
8 / 30 page 8/27 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) |
同様の部品番号 - BM2P121XH-Z |
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同様の説明 - BM2P121XH-Z |
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