Datasheet > GM1851L-S08-R

GM1851L-S08-R

更新时间： 2024-02-17 04:02:45

品牌	Logo	应用领域
友顺 - UTC		光电二极管
页数	文件大小	规格书
10页	364K
描述
Power Supply Support Circuit, Fixed, 1 Channel, PDSO8, LEAD FREE, SOP-8

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技术参数
数据手册

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GM1851L-S08-R 技术参数

是否Rohs认证：	符合	生命周期：	Active
零件包装代码：	SOIC	包装说明：	LSOP,
针数：	8	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.7	可调阈值：	NO
模拟集成电路 - 其他类型：	POWER SUPPLY SUPPORT CIRCUIT	JESD-30 代码：	R-PDSO-G8
长度：	4.92 mm	信道数量：	1
功能数量：	1	端子数量：	8
最高工作温度：	70 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	LSOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, LOW PROFILE
峰值回流温度（摄氏度）：	NOT SPECIFIED	认证状态：	Not Qualified
座面最大高度：	1.7 mm	表面贴装：	YES
温度等级：	OTHER	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	3.95 mm
Base Number Matches：	1

GM1851L-S08-R 数据手册

GM1851

LINEAR INTEGRATED CIRCUIT

UL943 specifies ≤25 ms average trip time under these conditions. Calculation of C_tbased upon charging currents

due to normal fault only is as follows:

≤25 ms Specification

-3 ms GFI turn-on time (15k and 1μF)

-8 ms Potential loss of one half-cycle due to fault current sense of half-cycles only

-4 ms Time required to open a sluggish circuit breaker

≤10 ms Maximum integration time that could be allowed

8 ms Value of integration time that accommodates component tolerances and other variables

1 × T

Ct=

(5)

Where T=integration time

V=threshold voltage

I=average fault current into C_t

RG + RN

120VAC(rms)

1 turn

1000 turns

I =

0.91

(6)

rms to

average

conversion

Ct charging

on half-

cycles only

current

portion of

fault current

shunted

heavy fault

current generated

(swamps ITH)

division of

input sense

transformer

around GFI

therefore:

120

500

0.4

1.6+0.4

1000

0.91

× 0.0008

Ct =

(7)

17.5

Ct = 0.01μF

In practice, the actual value of C1 will have to be modified to include the effects of the neutral loop upon the net

charging current. The effect of neutral loop induced currents is difficult to quartile, but typically they sum with normal

fault currents, thus allowing a larger value of C1.

For UL943 requirements, 0.015μF has been found to be the best compromise between timing and noise.

For those GFI standards not requiring grounded neutral detection, a still larger value capacitor can be used and

better noise immunity obtained. The larger capacitor can be accommodated because RN and RG are not present,

allowing the full fault current, I, to enter the GFI.

In Figure 2, grounded neutral detection is accomplished by feeding the neutral coil with 120 Hz energy

continuously and allowing some of the energy to couple into the sense transformer during conditions of neutral fault.

UNISONIC TECHNOLOGIES CO., LTD

7 of 10

www.unisonic.com.tw

QW-R122-007,B

1...4 5 678 9 10

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