3652

更新时间： 2024-02-05 01:06:09

品牌	Logo	应用领域
德州仪器 - TI		隔离放大器分离技术隔离技术
页数	文件大小	规格书
14页	149K
描述
Optically-Coupled Linear ISOLATION AMPLIFIERS

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3652 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	MODULE	包装说明：	DIP-32
针数：	32	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.33.00.01
风险等级：	5.69	Is Samacsys：	N
放大器类型：	ISOLATION AMPLIFIER	最大共模电压：	2000 V
最小绝缘电压：	2000 V	JESD-30 代码：	R-MDMA-P32
标称负供电电压 (Vsup)：	-15 V	功能数量：	1
端子数量：	32	最高工作温度：	85 °C
最低工作温度：		封装主体材料：	METAL
封装代码：	DIP	封装等效代码：	DIP32,.9
封装形状：	RECTANGULAR	封装形式：	MICROELECTRONIC ASSEMBLY
峰值回流温度（摄氏度）：	NOT SPECIFIED	电源：	+-8/+-18 V
认证状态：	Not Qualified	子类别：	Isolation Amplifier
标称供电电压 (Vsup)：	15 V	表面贴装：	NO
温度等级：	OTHER	端子形式：	PIN/PEG
端子节距：	2.54 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	Base Number Matches：	1

3652 数据手册

NONLINEARITY

DEFINITIONS

ISOLATION-MODE VOLTAGE, V_ISO

Nonlinearity is specified to be the peak deviation from a best

straightline expressed as a percent of peak-to-peak full scale

output (i.e. ±10mV at 20Vp-p ≈ 0.05%).

The isolation-mode voltage is the voltage which appears

across the isolation barrier, i.e., between the input common

and the output common. (See Figure 1.)

Two isolation voltages are given in the electrical specifica-

tions: “rated continuous” and “test voltage”. Since it is

impractical on a production basis to test a “continuous”

voltage (infinite test time is implied), it is a generally

accepted practice to test at a significantly higher voltage for

some reasonable length of time. For the 3650 and 3652, the

“test voltage” is equal to 1000V plus two times the “rated

continuous” voltage. Thus, for a continuous rating of 2000V,

each unit is tested at 5000V.

THEORY OF OPERATION

Prior to the introduction of the 3650 family optical isolation

had not been practical in linear circuits. A single LED and

photodiode combination, while useful in a wide range of

digital isolation applications, has fundamental limitations—

primarily nonlinearity and instability as a function of time

and temperature.

The 3650 and 3652 use a unique technique to overcome the

limitations of the single LED and photodiode isolator.

Figure 2 is an elementary equivalent circuit for the 3650,

which can be used to understand the basic operation without

considering the cluttering details of offset adjustment and

biasing for bipolar operation.

COMMON-MODE VOLTAGE, V_CM

The common-mode voltage is the voltage midway between

the two inputs of the amplifier measured with respect to

input common. It is the algebraic average of the voltage

applied at the amplifiers’ input terminals. In the circuit in

Figure 1, (V₊+ V_–)/2 = V_CM. (NOTE: Many applications

involve a large system “common-mode voltage.” Usually in

such cases the term defined here as “V_CM” is negligible and

the system “common-mode voltage” is applied to the ampli-

fier as “V_ISO” in Figure 1.)

Isolation Barrier

R_K

CR₃

CR₁

CR₂

I₁

I₂

–

+V_CC

λ1

λ2

R_G

–

I₂

A₂

ISOLATION-MODE REJECTION

A₁

I_IN

V_IN

I₃

The isolation-mode rejection is defined by the equation in

Figure 1. The isolation-mode rejection is not infinite be-

cause there is some leakage across the isolation barrier due

to the isolation resistance and capacitance.

V_OUT

–V

–V_CC

Output Common

Input Common

R_K

V_OUT= V_IN

R_G

Isolation Barrier

R_G1

FIGURE 2. Simplified Equivalent Circuit of Linear Isolator.

V+

Two matched photodiodes are used—one in the input (CR₃)

and one in the output stage (CR₂)—to greatly reduce

nonlinearities and time-temperature instabilities. Amplifier

A₁, LED CR₁, and photodiode CR₃are used in a negative

feedback configuration such that I₁= I_INR_G(where R_Gis the

user supplied gain setting resistor). Since CR₂and CR₃are

closely matched, and since they receive equal amounts of

light from the LED CR₁(i.e., λ₁= λ₂), I₂= I₁= I_IN. Amplifier

A₂is connected as a current-to-voltage converter with V_OUT

= I₂R_Kwhere R_Kis an internal 1MΩ scaling resistor. Thus

the overall transfer function is:

R_IN

V_D

R_G2

V–

V_OUT

–

I_L

V_CM

(Input)

(Output)

V_ISO

System

Ground

10⁶

R_G1+ R_G2+ R_IN

V_CM

V_ISO

V_OUT= V_IN

, (R_Gin Ωs)

V_OUT

V_D

R_G

CMRR

IMRR

This improved isolator circuit overcomes the primary

limitations of the single LED and photodiode combination.

The transfer function is now virtually independent of any

degradation in the LED output as long as the two photo-

diodes and optics are closely matched⁽¹⁾. Linearity is now a

FIGURE 1. Illustration of Isolation-Mode and Common-

Mode Specifications.

NOTE: (1) The only effect of decreased LED output is a slight decrease in full

scale swing capability. See Typical Performance Curves.

3650/52

1...3 4 567 8 9...14

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