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 – continued

14 Short Circuit Protection (SCP), REF Pin Open Protection (REFOPEN)

This is the block of the short protection and the open protection of the REF pin.

14.1 Short Circuit Protection (SCP)

As IC converts the primary flyback voltage to REF pin voltage, IC detects secondary output status. When

secondary output voltage drops, REF pin voltage also drops. When REF pin voltage is below V_SCP, IC detects

SCP. When the detection continues for t_MASK, the switching operation is stopped. After the time of t_RESTARTpasses

from the stop, IC restarts with soft start function. To prevent SCP miss detection, the detection of SCP is invalid

for t_MASKSCPat start-up. When REF voltage is lower than V_SCPfor t_MASKSCPfrom start-up, IC stops switching for

t_RESTART

t_SS

tMASK

Output voltage

SW pin voltage

V_SCP

REF pin voltage

Switching

t_RESTART

SCP status

Figure 6. SCP Timing Chart

14.2 REF Pin Open Protection (REFOPEN)

The REF pin detects the secondary output voltage status from the primary flyback voltage. When the REF pin is

open, output status is not detected, and switching MOSFET may occur malfunction. Therefore, when REF pin

voltage is above V_REFOP, the IC detects REFOPEN protection. When the detection continues for t_MASK, the

switching operation is stopped. After the time of t_RESTARTfrom the stop, IC restarts with soft start function.

When auto recovery, IC operates for t_MASKfrom start-up. When REF pin voltage is above V_REFOPfor t_MASK, IC

stops switching for t_RESTART

t_SS

Output voltage

SW pin voltage

V_REFOP

REF pin voltage

t_MASK

t_RESTART

Switching

REFOPEN

status

Figure 7. REFOPEN Protection Timing Chart

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TSZ22111 • 15 • 001

TSZ02201-0F1F0A200900-1-2

7/32

13.Dec.2022 Rev.001

1...4 5 678 9 10...35

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