< Dual-In-Line Package Intelligent Power Module >
Series Application note
Publication Date: September 2016
19
2.2.3 Temperature output function V
OT
(1) Usage of this function
This function measures the temperature of control LVIC by built in temperature sensor on LVIC.
The heat generated at IGBT and FWDi transfers to LVIC through molding resin of package and outer heat sink.
So LVIC temperature cannot respond to rapid temperature rise of those power chips effectively. (e.g. motor lock,
short circuit). It is recommended to use this function for protecting from slow excessive temperature rise by such
cooling system down and continuance of overload operation.
（
Replacement from the thermistor which was
mounted on outer heat sink currently
）
(note)
In this function, DIPIPM cannot shutdown IGBT and output fault signal by itself when temperature rises
excessively. When temperature exceeds the defined protection level, controller (MCU) should stop the
DIPIPM.
Fig.2-2-7
Temperature detecting point
Fig.2-2-8 Thermal conducting from power chips
(2) VOT characteristics
VOT output circuit, which is described in Fig.2-2-9, is the output of OP amplifier circuit. The current capability
of VOT output is described as Table 2-2-5. The characteristics of VOT output vs. LVIC temperature is linear
characteristics described in Fig.2-2-11. There are some cautions for using this function as follows.
Table 2-2-5 Output capability
(Tc=-20°C ~100°C)
min.
Source
1.7mA
Sink
0.1mA
Source: Current flow from V
OT
to outside.
Sink
: Current flow from outside to V
OT
.
Fig.2-2-9 V
OT
output circuit
(note) In the case of detecting lower temperature than room temperature
It is recommended to insert 5.1k
Ω pull down resistor for getting linear output characteristics at lower
temperature than room temperature. When the pull down resistor is inserted between V
OT
and V
NC
(control
GND), the extra current calculated by V
OT
output voltage / pull down resistance flows as LVIC circuit
current continuously. In the case of only using V
OT
for detecting higher temperature than room
temperature, it isn't necessary to insert the pull down resistor.
Fig.2-2-10 V
OT
output circuit in the case of detecting low temperature
Ref
V
OT
Temperature
signal
V
NC
Inside LVIC
of DIPIPM
5V
MCU
Ref
V
OT
Temperature
signal
V
NC
Inside LVIC
of DIPIPM
5.1
kΩ
MCU
LVIC
(Detecting point)
Power chip area
Heatsink
IGBT
LVIC
FWDi
Temperature of
LVIC is affected
from heatsink.
