参数资料
型号: IRS26302DJTRPBF
厂商: International Rectifier
文件页数: 29/53页
文件大小: 0K
描述: IC GATE DRIVER 3PH BRIDGE 44PLCC
标准包装: 1
配置: 3 相桥
输入类型: 非反相
延迟时间: 320ns
电流 - 峰: 200mA
配置数: 1
输出数: 3
高端电压 - 最大(自引导启动): 600V
电源电压: 10 V ~ 20 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 44-PLCC(32 引线)
供应商设备封装: 44-PLCC,32 引线
包装: 标准包装
产品目录页面: 1382 (CN2011-ZH PDF)
其它名称: IRS26302DJTRPBFDKR
IRS26302DJ
Integrated Bootstrap Functionality
The IRS26302DJ features integrated high-voltage bootstrap MOSFETs that eliminate the need of the external
bootstrap diodes and resistors in many applications.
There is one bootstrap MOSFET for each high-side output channel and it is connected between the V CC supply and
its respective floating supply (i.e., V B1 , V B2 , V B3 ); see Figure 24 for an illustration of this internal connection.
The integrated bootstrap MOSFET is turned on only during the time when LO is ‘high’, and it has a limited source
current due to R BS . The V BS voltage will be charged each cycle depending on the on-time of LO and the value of the
C BS capacitor, the drain-source (collector-emitter) drop of the external IGBT (or MOSFET), and the low-side free-
wheeling diode drop.
The bootstrap MOSFET of each channel follows the state of the respective low-side output stage (i.e., the bootstrap
MOSFET is ON when LO is high, it is OFF when LO is low), unless the V B voltage is higher than approximately 110%
of V CC . In that case, the bootstrap MOSFET is designed to remain off until V B returns below that threshold; this
concept is illustrated in Figure 25.
V B1
V CC
V B2
V B3
Figure 24: Internal bootstrap MOSFET connection
Figure 25: Bootstrap MOSFET state diagram
A bootstrap MOSFET is suitable for most of the PWM modulation schemes and can be used either in parallel with the
external bootstrap network (i.e., diode and resistor) or as a replacement of it. The use of the integrated bootstrap as
a replacement of the external bootstrap network may have some limitations. An example of this limitation may arise
when this functionality is used in non-complementary PWM schemes (typically 6-step modulations) and at very high
PWM duty cycle. In these cases, superior performances can be achieved by using an external bootstrap diode in
parallel with the internal bootstrap network.
Bootstrap Power Supply Design
For information related to the design of the bootstrap power supply while using the integrated bootstrap functionality
of the IRS26302DJ, please refer to Application Note 1123 (AN-1123) entitled “Bootstrap Network Analysis: Focusing
on the Integrated Bootstrap Functionality.” This application note is available at www.irf.com .
For information related to the design of a standard bootstrap power supply (i.e., using an external discrete diode)
please refer to Design Tip 04-4 (DT04-4) entitled “Using Monolithic High Voltage Gate Drivers.” This design tip is
available at www.irf.com .
www.irf.com
29
? 2009 International Rectifier
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