Datasheet > BD7J200HFN-LB

BD7J200HFN-LB

更新时间： 2023-09-03 20:25:15

品牌	Logo	应用领域
罗姆 - ROHM		变压器光电转换器
页数	文件大小	规格书
41页	1557K
描述
本产品是面向工业设备市场的产品，保证可长期稳定供货。适合用于工业设备的绝缘电源。本产品是无需光电耦合器的绝缘型反激式转换器。无需以往用途中为获得稳定输出电压所需的光电耦合器、变压器3次绕组构成的反馈电路。还采用了独创的适应型导通时间控制技术，不需要外接相位补偿部件，可大幅减少部件个数，并实现小型、高可靠性的绝缘型电源应用设计。

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数据手册

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BD7J200HFN-LB 数据手册

BD7J200HFN-LB BD7J200EFJ-LB BD7J200UEFJ-LB

Description of Blocks

INTERNAL REGULATOR

This is the regulator block for internal circuits.

This block also shuts itself down at the shutdown status of the SDX/EN pin voltage ≤ V_SDX

The SDX/EN pin voltage becomes V_EN1or more, the IC becomes enable status and the output voltage rises slowly by

the soft start function. The SDX/EN pin voltage becomes V_EN2or less, the IC becomes disable status and stops the

switching operation.

VIN pin voltage

V_EN1

V_EN2

SDX/EN pin voltage

t_SS

Setting output voltage

Setting output voltage × 0.9

Output voltage

Switching

Figure 1. Startup and Stop Timing Chart

In the control method of this IC, it is necessary to operate in the status that the duty is D_MAXor less. At the startup

and stop, set the VIN pin voltage V_INto meet the next formula.

ꢀ_푃

ꢀ_푆

[V]

(

)

푉 >

퐼푁

× 푉_푂푈푇+ 푉_퐹ꢁ

− 1ꢂ

퐷_푀퐴푋

Where:

is the VIN pin voltage.

푉

퐼푁

ꢀ_푃is the number of winding at the primary transformer.

ꢀ_푆is the number of winding at the secondary transformer.

푉_푂푈푇is the output voltage.

푉_퐹is the forward voltage of the secondary output diode.

퐷_푀퐴푋is the maximum duty.

In the case that the SDX/EN pin is shorted to the VIN pin the duty becomes D_MAXor more at startup and stop, and

there may be occur the output voltage without intending. Refer to Application Examples: 6 Enable Voltage and

Disable Voltage for the enable control by the VIN pin.

www.rohm.com

TSZ22111 • 15 • 001

TSZ02201-0F1F0BZ00010-1-2

20.Mar.2023 Rev.002

3/38

1 234 5 6 7...41

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