Datasheet > BD85506F

BD85506F

更新时间： 2023-09-03 20:25:10

品牌	Logo	应用领域
罗姆 - ROHM		开关控制器脉冲比较器稳压器
页数	文件大小	规格书
38页	1468K
描述
BD85506F是具备各种二次侧异常检测功能的LLC用2ch二次侧同步整流控制器。本IC内置检测BODYDIODE整流动作等FET异常的功能。还内置高精度过电压检测电路，有助于提高安全性并减少外接零部件。在效率方面，可通过电阻调整同步整流FET的OFF阈值电压。而且，通过设置各FET的SOURCE监视端子，可监视各DRAIN-SOURCE间电压，能进一步改善效率。一次侧控制器在轻负载时的启动脉冲串会使同步整流动作自动处于待机状态，抑制开关功率及IC自身的电路电流，减少待机功耗。而且，内置的多功能比较器除用作异常检测比较器外，还可用作低功耗分流稳压器。工作电源电压范围广，为5.0V~32V，适用于各种输出电压产品阵容。采用高耐压120V(Max)处理器，可直接监视漏极电压。

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BD85506F 数据手册

Datasheet

Internal FET Abnormality Detection Function

High Efficiency / Low Standby Power

2-Channel Secondary Side Synchronous

Rectification Control IC

BD85506F

General Description

Key Specifications

BD85506F is a 2-channel secondary side Synchronous

Rectification (SR) controller for LLC with enhanced

abnormality detection function on the secondary side.

This IC has a function to detect FET abnormalities such

as body diode rectification operation.

◼ Input Voltage Range:

5.0 V to 32 V

◼ Operating Circuit Current

(SW Stopped Mode):

◼ Standby Circuit Current:

◼ Drain Monitor Pin Absolute Voltage:

800 µA(Typ)

300 µA(Typ)

120 V(Max)

In addition, it incorporates a high-accuracy overvoltage

detection circuit, contributing to improved safety and

reduction of external components.

For efficiency, the OFF threshold voltage of the

synchronous rectifier FET can be adjusted with a resistor.

Moreover, by providing the Source monitor pin of each

FET, it is possible to monitor the voltage between Drain

and Source, and further improvement in efficiency is

possible.

◼ Operating Temperature Range: -40 °C to +105 °C

Package

W(Typ) x D(Typ) x H(Max)

8.70 mm x 6.20 mm x 1.71 mm

SOP14

In the burst operation at light load of the primary side

controller, the synchronous rectification operation is

automatically placed in the standby state, suppressing the

switching power and the circuit current of the IC itself and

reducing standby power consumption.

The built-in multipurpose comparator can also be used as

a low consumption shunt regulator in addition to the

abnormality detection comparator.

The operating power supply voltage ranges from 5.0 V to

32 V, covering various output voltage lineups.

Additionally, by adopting a process with a high withstand

voltage of 120 V(Max), it is possible to directly monitor the

Drain voltage.

Applications

Isolated LLC Type AC/DC Power Supply.

Adapter, TV, Printer, Office Equipment, etc.

Typical Application Circuits

Features

◼ Internal FET Abnormality Detection Function for

Secondary Side Synchronous Rectification.

◼ Internal Overvoltage Detection Circuit (OVP).

(Externally adjustable, high accuracy: 2 %)

◼ Efficiency Improvement by FET OFF Threshold

Voltage is Adjustable.

OUT

◼ Source of each FET can be individually monitored.

◼ Internal Standby Mode Automatic Determination

Function.

GND

◼ Internal Multipurpose Comparator. (It can also be

used as a shunt regulator)

◼ With the Slow Start Function, it is possible to set the

FET Abnormality Detection Function at startup and

the during the start of Switching Operation

◼ Wide Input Voltage Range 5.0 V to 32 V

◼ D1, D2 Pin 120 V (Max) Breakdown Voltage

◼ Flow Compatible SOP14 Package

(Remark) The values in the datasheet are typical unless otherwise specified.

FAIL

〇Product structure : Silicon monolithic integrated circuit 〇This product has no designed protection against radioactive rays.

www.rohm.com

TSZ22111 • 14 • 001

TSZ02201-0F2F0A200310-1-2

28.Dec.2020 Rev.002

1/35

12 3 4 5 6 7...38

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