TI-ISOW1432：隔离式RS-485/RS-422转换器，内置低功耗DC-DC转换器

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"TI-ISOW1432.pdf 是一份技术文档，主要介绍了一款集成了隔离功能的RS-485/RS-422收发器，该器件具有低辐射、低噪声和高效率的DC-DC转换器。这款器件符合TIA/EIA-485A标准，适用于需要隔离和高效能通信的工业应用场合。" TI公司的ISOW1432是一款高性能的隔离式RS-485/RS-422收发器，它在设计上兼顾了高速数据传输和低辐射特性。ISOW1412支持的数据速率最高为500kbps，而ISOW1432则可达12Mbps，满足了高速通信需求。器件内置的DC-DC转换器采用低辐射技术，不仅符合CISPR32 Class B和EN55032 Class B标准，而且在两层PCB板上仍有余量，确保了低噪声性能。其25MHz的低频电源转换器有助于实现优异的噪声抑制。此外，ISOW1432还提供了一个额外的2Mbps GPIO通道，增加了系统设计的灵活性。该器件的输出功率效率高达46%，电压精度控制在±5%，并且能提供额外的20mA输出电流。ISOW1432提供了独立的电源供应，逻辑电源（VIO）范围为1.71V至5.5V，而电源转换器电源（VDD）为3V至5.5V，这使得RS-485与DC-DC部分的电源隔离更加彻底。该收发器兼容PROFIBUS协议，具备开路、短路和空闲总线故障安全功能，支持1/8单位负载，最大可连接256个节点。在电源启动和关闭时，ISOW1432能实现无毛刺转换，确保系统的稳定。器件提供了强化和基本隔离选项，具有高共模瞬态抗扰度（CMTI）达100-kV/µs，以及高的电磁干扰（ESD）防护等级，包括人体模型（HBM）±16kV和IEC61000-4-2接触放电±8kV。 ISOW1432的工作温度范围广泛，可在-40°C到125°C的环境下正常工作。同时，它还具有电流限制和热关断保护功能，增强了系统在恶劣环境下的可靠性。这款器件是工业自动化、远程监控和电力通讯等应用的理想选择，能够提供高性能、高隔离和高可靠性的解决方案。

8.5 Insulation Specifications

PARAMETER TEST CONDITIONS VALUE UNIT

GENERAL

CLR External clearance

(1)

Shortest terminal-to-terminal distance through air > 8 mm

CPG External creepage

(1)

Shortest terminal-to-terminal distance across the package

surface

> 8 mm

DTI Distance through the insulation

Minimum internal gap (internal clearance – capacitive

signal isolation)

> 17

Minimum internal gap (internal clearance- transformer

power isolation)

> 120

CTI Comparative tracking index DIN EN 60112 (VDE 0303-11); IEC 60112 > 600 V

Material group According to IEC 60664-1 I

Overvoltage category per IEC 60664-1

Rated mains voltage ≤ 150 V

RMS

I-IV

Rated mains voltage ≤ 300 V

RMS

I-IV

Rated mains voltage ≤ 600 V

RMS

I-IV

Rated mains voltage ≤ 1000 V

RMS

I-III

DIN VDE V 0884-11:2017-01

(2)

IORM

Maximum repetitive peak isolation voltage AC voltage (bipolar) 1500 V

IOWM

Maximum working isolation voltage

AC voltage (sine wave) Time dependent dielectric

breakdown (TDDB) test

1000 V

RMS

DC voltage 1500 V

IOTM

Maximum transient isolation voltage

TEST

= V

IOTM

, t = 60 s (qualification);

TEST

= 1.2 × V

IOTM

, t = 1 s (100% production)

7071 V

IOSM

Maximum surge isolation voltage ISOW14x2

(3)

Test method per IEC 62368-1, 1.2/50 µs waveform,

TEST

= 1.6 × V

IOSM

= 10 kV

(qualification)

6250 V

IOSM

Maximum surge isolation voltage ISOW14x2B

(3)

Test method per IEC 62368-1, 1.2/50 µs waveform,

TEST

= 1.3 × V

IOSM

= 7.8 kV

(qualification)

6000 V

Apparent charge

(4)

Method a: After I/O safety test subgroup 2/3,

ini

= V

IOTM

, t

ini

= 60 s;

pd(m)

= 1.2 × V

IORM

, t

= 10 s

≤ 5

Method a: After environmental tests subgroup 1,

ini

= V

IOTM

, t

ini

= 60 s;

ISOW14x2: V

pd(m)

= 1.6 × V

IORM

, t

= 10 s. ISOW14x2B:

pd(m)

= 1.2 × V

IORM

, t

= 10 s

≤ 5

Method b1: At routine test (100% production) and

preconditioning (type test)

ini

= 1.2 × V

IOTM

, t

ini

= 1 s;

ISOW14x2: V

pd(m)

= 1.875 × V

IORM

, t

= 1 s. ISOW14x2B:

pd(m)

= 1.5 × V

IORM

, t

= 1 s

≤ 5

Barrier capacitance, input to output

(5)

= 0.4 sin (2πft), f = 1 MHz ~3.5 pF

Isolation resistance, input to output

(5)

= 500 V, T

= 25°C > 10

= 500 V, 100°C ≤ T

≤ 125°C > 10

= 500 V at T

= 150°C > 10

Pollution degree 2

Climatic category 40/125/21

UL 1577

ISO

Withstand isolation voltage

TEST

= V

ISO

= 5000 V

RMS

, t = 60 s (qualification); V

TEST

1.2 × V

ISO

= 6000 V

RMS

, t = 1 s (100% production)

5000 V

RMS

(1) Creepage and clearance requirements should be applied according to the specific equipment isolation standards of an application.

Care should be taken to maintain the creepage and clearance distance of a board design to ensure that the mounting pads of

the isolator on the printed-circuit board do not reduce this distance. Creepage and clearance on a printed-circuit board become

equal in certain cases. Techniques such as inserting grooves and/or ribs on a printed circuit board are used to help increase these

specifications.

(2) ISOW14x2 is suitable for safe electrical insulation and ISOW14x2B is suitable for basic electrical insulation only within the safety

ratings.. Compliance with the safety ratings shall be ensured by means of suitable protective circuits.

(3) Testing is carried out in air or oil to determine the intrinsic surge immunity of the isolation barrier.

(4) Apparent charge is electrical discharge caused by a partial discharge (pd).

(5) All pins on each side of the barrier tied together creating a two-terminal device

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ISOW1412, ISOW1432

SLLSF86B – MAY 2018 – REVISED OCTOBER 2021

Submit Document Feedback

Product Folder Links: ISOW1412 ISOW1432

8.6 Safety-Related Certifications

VDE CSA UL TUV CQC

Certified according to DIN

VDE V 0884-11 :2017-01

Certified according to IEC

62368-1, IEC 61010-1 and

IEC 60601-1

Certified under UL 1577

Component Recognition

Program

Certified ccording to EN

61010-1:2010/ A1:2019 and

EN 62368-1:2014

Plan to certify according to

GB4943.1-2011

Maximum transient isolation

voltage 7071 V

;

Maximum repetitive peak

isolation voltage, 1500

; Maximum surge

isolation voltage, ISOW14x2:

6250 V

(Reinforced),

ISOW14x2B:

6000 V

(Basic)

Per CSA62368-1:19, IEC

62368-1:2018 Ed. 3,

CSA 61010-1-12+A1 and

IEC 61010-1 3rd Ed.,

ISOW14x2 (Reinforced): 600

RMS,

ISOW14x2B (Basic):

1000 V

RMS

maximum

working voltage (pollution

degree 2, material group I,

ambient temperature 90 ℃),

2 MOPP (Means of

Patient Protection) per CSA

60601- 1:14 . IEC 60601-1

(ISOW14x2 only) Ed.3+A1,

250 V

RMS

maximum working

voltage

Single protection, 5000 V

RMS

ISOW14x2 (Reinforced):

5000 V

RMS

reinforced

insulation per EN

61010-1:2010/A1:2019 and

EN 62368-1:2014 up to

working voltage of 600

RMS

. ISOW14x2B (Basic):

1000 V

RMS

Reinforced insulation, Altitude ≤

5000 m, Tropical Climate, 700

RMS

maximum working voltage.

Certification number:

40040142. ISOW1432

planned

Master Contract Number:

220991. ISOW1432 planned

File number: E181974.

ISOW1432 planned

Client ID number: 77311.

ISOW1432 planned

Certificate number:

CQC21001297517. ISOW1432

planned

8.7 Safety Limiting Values

Safety limiting intends to minimize potential damage to the isolation barrier upon failure of input or output circuitry.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Safety input, output, or supply current

(1)

θJA

= 68.5°C/W, V

= 5.5 V, T

= 150°C, T

= 25°C , See

Figure 8-1

332

θJA

= 68.5°C/W, V

= 3.6 V, T

= 150°C, T

= 25°C , See

Figure 8-1

507

Safety input, output, or total power

(1)

θJA

= 68.5°C/W, T

= 150°C, T

= 25°C , See Figure 8-2 1826 mW

Safety temperature

(1)

150 °C

(1) The maximum safety temperature,T

, has the same value as the maximum junction temperature,T

, specified for the device. The

and P

parameters represent the safety current and safety power respectively.The maximum limits of I

and P

should not

beexceeded. These limits vary with the ambient temperature, T

The junction-to-air thermal resistance, R

θJA

, in the Thermal Information table is that of a device installed on a high-K test board

forleaded surface-mount packages. Use these equations to calculate the value for each parameter:

= T

+ R

θJA

× P, where P is the power dissipated in the device.

J(max)

= T

θJA

× P

, where T

J(max)

is the maximum allowed junction temperature.

= I

× V

, where V

is the maximum input voltage.

ISOW1412, ISOW1432

SLLSF86B – MAY 2018 – REVISED OCTOBER 2021

www.ti.com

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TI-ISOW1432：隔离式RS-485/RS-422转换器，内置低功耗DC-DC转换器

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