pm75cs1d120 Mitsumi Electronics, Corp., pm75cs1d120 Datasheet - Page 27

• Manufacturer Part Number: pm75cs1d120
• Description: Mitsubishi Ipm L1/s1-series Application Note Igbt Modules
• Manufacturer: Mitsumi Electronics, Corp.

Mitsubishi IPM L1/S1-Series Application Note
Using IPM
11-3. Area of Safe Operation for Intelligent Power Modules
The IPMs built-in gate drive and protection circuits protect it from many of the operating modes that would violate the
Safe Operation Area (SOA) of non-intelligent IGBT modules. A conventional SOA definition that characterizes all
possible combinations of voltage, cur-rent, and time that would cause power device failure is not required. In order to
define the SOA for IPMs, the power device capability and control circuit operation must both be considered. The
resulting easy to use short circuit and switching SOA definitions for Intelligent Power Modules are summarized in this
section.
(1) Switching SOA
Switching or turn-off SOA is normally defined in terms of the maximum allowable simultaneous volt-age and current
during repetitive turn-off switching operations. In the case of the IPM the built-in gate drive eliminates many of the
dangerous combinations of voltage and current that are caused by improper gate drive. In addition, the maximum
operating current is limited by the over current protection circuit. Given these constraints the switching SOA can be
defined using the waveform shown in following figure. This waveform shows that the IPM will operate safely as long as
the DC bus voltage is below the data sheet VCC(prot) specification, the turn-off transient voltage across C-E terminals
of each IPM switch is maintained below the VCES specification, Tj is less than 125°C, and the control power supply
voltage is between 13.5V and 16.5V. In this waveform IOC is the maximum cur-rent that the IPM will allow without
causing an Over Current (OC) fault to occur. In other words, it is just below the OC trip level. This waveform defines the
worst case for hard turn-off operations because the IPM will initiate a controlled slow shutdown for currents higher than
the OC trip level.
Switching SOA
(2) Short Circuit SOA
The waveform in following figure depicts typical short circuit operation. The standard test condition uses a minimum
impedance short-circuit which causes the maximum short circuit current to flow in the device. In this test, the short
circuit current (ISC) is limited only by the device characteristics. The IPM is guaranteed to survive non-repetitive short
circuit and over current conditions as long as the initial DC bus volt-age is less than the VCC(prot)specification, all
transient voltages across C-E terminals of each IPM switch are maintained less than the VCES specification, Tj is less
than125°C, and the control supply volt-age is between 13.5V and 16.5V.The waveform shown depicts the controlled
slow shutdown that is used by the IPM in order to help minimize transient voltages.
Note:
The condition VCE, VCES has to be carefully checked for each IPM switch. For easing the design an-other rating is
given on the datasheets, VCC(surge), i.e., the maximum allowable switching surge voltage applied between the P and
N terminals.
SC SOA
27
Sep. 2008