Datasheet > BD7F005EFJ-C (开发中)

BD7F005EFJ-C (开发中)

更新时间： 2023-09-03 20:31:57

品牌	Logo	应用领域
罗姆 - ROHM		/
页数	文件大小	规格书
35页	1270K
描述
BD7F005EFJ-C is an opto-coupler-less isolated flyback converter. Feedback circuit by optocouplers or the auxiliary winding of transformers becomes unnecessary, contributing to reduction of set parts. Furthermore, the adoption of original adapted ON-time control technology enables fast load response. In addition, the various protection function realizes the designs of isolated power supply application for high reliability.

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BD7F005EFJ-C

Description of Blocks

INTERNAL REGULATOR

This is regulator block for internal circuits.

This block shuts itself down at the shutdown status of SDX/EN pin voltage V_SDXor less.

When SDX/EN pin voltage rises above V_SDX, IC consumption current increases.

When SDX/EN pin voltage is above V_EN1, IC enters the enable status and starts switching operation.

The soft start function operates for t_SSperiod from switching start, and the output voltage rises slowly.

When SDX/EN pin voltage falls below V_EN2, IC enters the disable status and the switching operation is stopped.

VIN

pin voltage

VEN1

VEN2

VSDX

SDX/EN

pin voltage

tss

Output

voltage

Switching

Figure 1. Startup and Stop Timing Chart

Input Low Voltage Lock Out (UVLO)

This is the protection function for the low input voltage of the VIN pin.

When VIN pin voltage falls below V_UVLO1, IC detects UVLO and stops switching operation.

When VIN pin voltage rises above V_UVLO2, IC starts switching operation and a soft start function operates during the

period of t_SS

VUVLO2

VUVLO1

VIN

pin voltage

0 V

tss

Output

voltage

Switching

Figure 2. VIN UVLO Timing Chart

www.rohm.com

TSZ22111 • 15 • 001

TSZ02201-0F1F0A200900-1-2

4/32

13.Dec.2022 Rev.001

1 2 345 6 7...35

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