Datasheet > BD7F105EFJ-C (新产品)

BD7F105EFJ-C (新产品)

更新时间： 2023-09-03 20:25:24

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
35页	1194K
描述
BD7F105EFJ-C是不需要光耦的隔离型反激式转换器。该产品不需要由光电耦合器或变压器辅助绕组组成的反馈电路，有助于削减应用产品的部件数量。另外，该产品还通过采用ROHM自有的自适应导通时间控制技术，实现了高速负载响应。此外，还具有多种保护功能，可提高隔离型电源应用设计的可靠性。

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BD7F105EFJ-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

www.rohm.com

TSZ22111 • 15 • 001

TSZ02201-0F1F0A200870-1-2

7/32

01.Mar.2022 Rev.001

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