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

11 LOAD COMPENSATION

This block compensates the decrease of output voltage caused by the change of V_Fcharacteristic in the secondary

output diode which is proportional to load current. It monitors the current flown to the switching MOSFET and a part of

the current flows to the REF pin. The quantity of compensation determines by the external resistor and capacitor at

the L_COMP pin and K_{L_COMP}which is coefficient for SW current. For that, as the current flown from the FB pin to the

external resistor of the REF pin decreases, the output voltage decrease is compensated.

12 Frequency Spectrum Spread (SPECTRUM SPREAD)

This is the function to spread switching frequency.

The frequency spreading in the range of ±5 % contributes to low EMI.

13 Over Current Protection (OCP), Battery Short Protection (BSP)

This function is over current protection of the MOSFET.

13.1 Over Current Protection (OCP)

When the switching MOSFET is on, as the primary transformer peak current becomes I_LIMITor more, IC detects

the over current and the switching MOSFET is turned off. Because IC detects OCP per switching cycles, ON duty

is limited and the output voltage drops. In addition, to prevent miss detection by turn ON surge, the detection of

OCP is invalid for t_{ON_MIN}after the switching MOSFET is turned on.

After IC detects OCP, switching MOSFET is turn off after a delay time. When VIN voltage is increased, I_LIMITis

higher by the rise of current slope. ΔI_LIMITdepends on L_Pvalue of transformer.

∆퐼_{퐿ꢀ푀ꢀ푇}= 푉퐼푁 × 푡_{퐷퐸퐿퐴푌}/ ꢁ_푃

OCP detection delay time

푡_{퐷퐸퐿퐴푌}

ꢁ_푃

Primary inductance

푡_{퐷퐸퐿퐴푌}is always 0.2 µs or less.

Output voltage

I_LIMIT

Primary coil current

SW pin voltage

t_{ON_MIN}

OCP

Normal

IC status

Figure 4. OCP Timing Chart

13.2 Battery Short Protection (BSP)

In the case of increasing peak current by CCM (Continuous Conduction Mode) operation such as the short of the

transformer winding or output short of secondary, large current over I_LIMITis flown to the switching MOSFET. To

prevent this phenomenon, IC is built-in BSP function. When SW pin current becomes I_BSPor more at the

switching MOSFET ON, the IC detects BSP. By this function, the switching operation is stopped in the period of

t_BSP. After it passes t_BSP, IC recovers switching operation without soft-start function. When BSP state continues,

IC stops switching operation by SCP protection because output voltage is low. BSP is affected by the delay time

(t_DELAY) the same as OCP, and I_BSPincreases according to VIN voltage. Also, when primary transformer is short,

the function is operated.

Battery short is happened

I_BSP

Primary Coil

current

SW pin voltage

t_BSP

Switching

t_BSP

Output voltage

Figure 5. BSP Timing Chart

www.rohm.com

TSZ22111 • 15 • 001

TSZ02201-0F1F0A200870-1-2

6/32

01.Mar.2022 Rev.001

1...3 4 567 8 9...35

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