Datasheet > AN5177

AN5177

更新时间： 2024-02-17 04:43:06

品牌	Logo	应用领域
其他 - ETC		栅极栅极驱动
页数	文件大小	规格书
5页	100K
描述
Improve gate drive for GTO series connections

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AN5177 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	SDIP, SDIP30,.4	针数：	30
Reach Compliance Code：	unknown	风险等级：	5.92
其他特性：	ALSO REQUIRES 4.5-12 V SUPPLY	商用集成电路类型：	AUDIO/VIDEO DEMODULATOR
JESD-30 代码：	R-PDIP-T30	JESD-609代码：	e0
长度：	27.6 mm	功能数量：	1
端子数量：	30	最高工作温度：	70 °C
最低工作温度：	-20 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SDIP	封装等效代码：	SDIP30,.4
封装形状：	RECTANGULAR	封装形式：	IN-LINE, SHRINK PITCH
峰值回流温度（摄氏度）：	NOT SPECIFIED	电源：	5,5/12.2 V
认证状态：	Not Qualified	座面最大高度：	4.95 mm
子类别：	Other Consumer ICs	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	4.5 V	表面贴装：	NO
技术：	BIPOLAR	温度等级：	COMMERCIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	THROUGH-HOLE
端子节距：	1.778 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	10.16 mm
Base Number Matches：	1

AN5177 数据手册

AN5177 Application Note

AN5177

Improved Gate Drive For GTO Series Connections

Application Note

Replaces September 2000 version, AN5177-3.0

AN5177-3.1 July 2002

UsinganimprovedgatedrivetoeaseGTOseriesconnection

problems.

INTRODUCTION

There are problems encountered with dynamic voltage sharing

of series connected GTOs both at turn-on and turn-off. This

application note will deal with the problems associated with turn-

off and a further note will address turn-on problems.

Switching high voltages using rectifier diodes or thyristors is

routinely done using devices connected in series. With resistor

and capacitor networks connected, 100 devices or more can be

wired in series.

Thebasicproblemofseriesconnectionistoensuregoodvoltage

sharing between devices under both static and dynamic

conditions. By using devices selected within defined limits of

leakage current and reverse recovery charge, together with

correctly sized resistors and capacitors reliable operation is

assured.

Unfortunately, series connection of GTOs involves more

restraints. For traditional applications such as rail traction where

high turn-off currents are important series connection of GTOs

has not usually been cost effective. A higher voltage GTO has

been the preferred solution. However, this application note

showsthatevenstandarddesignGTOswhenusedwithimproved

performance gate drive units can be successfully connected in

series for certain applications.

Fig. 1 GTOs in series with snubber networks

In this note, a specific type of application is considered where

reverse blocking GTOs are used in series in a current source

inverter. In this application, the GTOs are not usually required to

turn-off near to their I_TCMlimits.

voltage source inverters turn-off by anode current reversal is not

usually relevant.

TURN-ON

THE SERIES CONNECTION PROBLEM

Three modes of operation need to be considered:

1. At GTO turn-on.

Figure 1 shows two GTOs in series with snubber networks fitted.

For simplicity, static sharing parallel resistors are not shown.

There will always be a time difference, ∆T, between the GTOs

turning on. This time difference is the combination of differences

in td and tr of the GTOs, together with the gate drive units

propagation time variations.

2. AtGTOturn-offbygatecommutation.Thisistheconventional

mode for most GTO applications.

3. At GTO turn-off by anode current reversal i.e. natural

commutation. This is similar to diode reverse recovery.

Figure 2 shows the waveforms at turn-on.

All these operating modes apply to current source inverters. For

1/5

www.dynexsemi.com

12 3 4 5

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AN5182NK	PANASONIC	获取价格	Consumer Circuit, PDIP24, 0.300 INCH, SHRINK, PLASTIC, DIP-24
AN5185FB	PANASONIC	获取价格	Consumer Circuit, PQFP44, 10 X 10 MM, PLASTIC, QFP-44
AN5186FB	PANASONIC	获取价格	VIF/SIF IC for car-TV
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AN5192K	PANASONIC	获取价格	Single chip IC with I2C bus Interface for PAL/NTSC color TV system
AN5193K	PANASONIC	获取价格	Consumer Circuit, PDIP64, 0.750 INCH, SHRINK, PLASTIC, DIP-64

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