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BM2P074KF

更新时间： 2023-09-03 20:24:58
品牌 Logo 应用领域
罗姆 - ROHM 开关转换器
页数 文件大小 规格书
22页 1182K
描述
内置AC/DC用MOSFET的PWM方式DC/DC转换器BM2P074KF-G为所有存在插口的产品提供优良的系统。绝缘、非绝缘均可对应，可轻松设计各种形式的低功耗转换器。内置800V耐压启动电路，有助于实现低功耗。外接开关用电流检测电阻，可实现高自由度的电源设计。使用电流模式控制，进行逐周期电流限制，发挥带宽和瞬态响应的优异性能。开关频率固定为65kHz。轻负载时降低频率，实现高效率。内置跳频功能，有助于实现低EMI。内置800V耐压MOSFET，设计简便。

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BM2P074KF 数据手册

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Daattaasshheeeett  
BM2P074KF-G  
(2 ) Start sequences  
(Soft start operation, light load operation, and auto recovery operation during overload protection)  
Start sequences are shown in Figure 7. See the sections below for detailed descriptions.  
Switching  
Figure 7. Start sequences Timing Chart  
A: Input voltage VH is applied  
B: This IC starts operating VCC pin voltage rises when VCC > VUVLO1 (14.8 V typ). Switching function starts when other  
protection functions are judged as normal. Between the secondary output voltage become constant level, because the  
VCC pin consumption current causes the VCC value to drop. VCC recharge function start if VCC voltage < VCHG2 （10V  
typ）  
C: With the soft start function, overcurrent limit value is restricted to prevent any excessive rise in voltage or current.  
D: When the switching operation starts, VOUT rises. The output voltage become to stable state, also VCC voltage become  
to stable state through auxiliary winding. Please set to achieve at the rated voltage within the TFOLP1B period (32ms typ)  
from VCC voltage > VUVLO1  
.
E: When there is a light load it reaches FB voltage < VBST (= 0.4Vtyp, burst operation is used to keep power consumption  
down. During burst operation, it becomes low-power consumption mode.  
F: When the FB Voltage＞VFOLP1A（=2.8V.typ）, it becomes a overload  
G: When FB pin voltage keeps VFOLP1A (= 2.8V typ) at or above T FOLP1A(64ms typ), the overload protection function is  
triggered and switching stops 64ms later. If the FB pin voltage becomes FB<VFOLP1B even once, the IC’s FB OLP timer is  
reset.  
H: If the VCC voltage drops to VCC < VUVLO2 (9.5V typ) or below, restart is executed.  
I: The IC’s circuit current is reduced and the VCC pin value rises. (Same as B)  
www.rohm.com  
TSZ02201-0F1F0A200270-1-2  
14.Mar.2017.Rev.002  
© 2015 ROHM Co., Ltd. All rights reserved.  
7/19  
TSZ22111・15・001  
1...45678910...22

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