Datasheet > BM2P21B

BM2P21B

更新时间： 2022-02-26 13:00:40

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罗姆 - ROHM		/
页数	文件大小	规格书
24页	3098K
描述
PWM Type DC/DC converter IC Integrated Switching MOSFET

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BM2P21B 数据手册

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BM2PX1A/BM2PX1B Series

(2) Start sequences

(Soft start operation, light load operation, and auto recovery operation by overload protection)

Start sequences are shown in Figure 3. See the sections below for detailed descriptions.

Figure 3. Start Sequences Timing Chart

A: The input voltage VH is applied.

B: This IC starts operating when the VCC pin voltage is higher than V_UVLO1(Typ.=15.5V).The Switching operation

starts when the other protection functions are judged as normal. While the secondary output voltage becomes

constant, the VCC pin current causes the VCC voltage to drop. As a result, the IC should be set the VCC voltage

to be higher than V_UVLO2(Typ.=10.2V) until the IC starts to switch.

C: With the soft start function, over current limit value is restricted to prevent any excessive rise in voltage or current.

D: When the switching operation starts, Vout rises. After the output voltage starts, set the rated voltage within the

T_FOLP1(Typ.=64ms) period.

E: In case of a light load, the IC operates burst mode to reduce power consumption if the FB voltage lowers than

V_BST1(Typ.=0.18V). During this time, it operates at low-power consumption mode.

F: When the FB pin Voltage is higher than V_FOLP1A(Typ.=2.8V), it overloads.

G: When the status that the FB voltage is higher than V_FOLP1A(Typ.=2.8V) continues for T _FOLP1(Typ.=64ms)^(NOTE1)

the overload protection function is triggered and the switching stops during T _FOLP2(Typ.=512ms) ^(NOTE2)

H: If the VCC voltage drops to lower than V_UVLO2(Typ.=10.7V), restart is executed.

I: After T _FOLP2(Typ.=512ms), it repeats F,G and H if the condition keeps on overload.

(NOTE 1): IC internal timer is reset if the overload is released within 64ms.

(NOTE 2): IC internal timer is reset if the overload is released within 512ms.

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TSZ22111・15・001

TSZ02201-0F1F0A200100-1-2

22. Mar.2017.Rev.002

6/20

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