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参数资料
| 型号： | IRMD2336DJ |
| 厂商： | International Rectifier |
| 文件页数： | 35/49页 |
| 文件大小： | 0K |
| 描述： | IC MOSFET DRIVER |
| 标准包装： | 1 |
| 系列： | * |
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IRS2336x(D) Family
Relevant Application Situations:
The above mentioned bias condition may be encountered under the following situations:
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In a motor control application, a permanent magnet motor naturally rotating while VCC power is OFF.
In this condition, Back EMF is generated at a motor terminal which causes high voltage bias on VS
nodes resulting unwanted current flow to VCC.
Potential situations in other applications where VS/VB node voltage potential increases before the
VCC voltage is available (for example due to sequencing delays in SMPS supplying VCC bias)
Application Workaround:
Insertion of a standard p-n junction diode between VCC pin of IC and positive terminal of VCC capacitors (as
illustrated in Fig.39) prevents current conduction “out-of” VCC pin of gate driver IC. It is important not to connect
the VCC capacitor directly to pin of IC. Diode selection is based on 25V rating or above & current capability
aligned to ICC consumption of IC - 100mA should cover most application situations. As an example, Part number
# LL4154 from Diodes Inc (25V/150mA standard diode) can be used.
VCC
VCC
VB
Capacitor
VSS
(or COM)
Figure 39: Diode insertion between VCC pin and VCC capacitor
Note that the forward voltage drop on the diode ( V F ) must be taken into account when biasing the VCC pin of the
IC to meet UVLO requirements. VCC pin Bias = VCC Supply Voltage – V F of Diode .
Additional Documentation
Several technical documents related to the use of HVICs are available at www.irf.com ; use the Site Search
function and the document number to quickly locate them. Below is a short list of some of these documents.
DT97-3: Managing Transients in Control IC Driven Power Stages
AN-1123: Bootstrap Network Analysis: Focusing on the Integrated Bootstrap Functionality
DT04-4: Using Monolithic High Voltage Gate Drivers
AN-978: HV Floating MOS-Gate Driver ICs
www.irf.com
35
? 2009 International Rectifier
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