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160 C), then a fault signal is asserted and the lower arm IGBTs are turned off. And then if LVIC temperature
Mini DIP (SPM3) Application Note (2012-07-09)
7.5 TSD (Thermal Shut-Down) Protection
The LVIC has a built-in TSD(Thermal Shut-Down) function. This function detects LVIC temperature
(not IGBT junction temperature). Purpose of this protection is to detect abnormal increase of case
temperature. Cooling fan stop or loose fixing of heat sink will cause it. So this TSD function will not work
effectively in the case of rapid temperature rise like motor lock condition or over current. (This protection
measures LVIC temperature, so it cannot respond to rapid temperature rise of IGBT & FRD)
This TSD function detects LVIC temperature and if LVIC temperature exceeds the Td (Td : Typical
o
decrease under Tr (Tr : Typical 155 o C), then a fault signal is released. The protection-timing chart is shown in
Figure 7.8.
Td : TSD Detection
Tr : TSD Reset
? Tdr : Hysteresis
Td
LVIC
Temperature
Fault Out
Tr
Δ Tdr (Hysteresis)
Signal
SET
RESET
SET
RESET
Control Supply
Voltage
+15V
Figure 7.8 Timing chart of LVIC TSD function
8. Bootstrap Circuit
8.1 Operation of Bootstrap Circuit
The V BS voltage, which is the voltage difference between V B (U, V, W) and V S (U, V, W) , provides the supply
to the HVICs within the Mini DIP SPM. This supply must be in the range of 13.0~18.5V to ensure that the
HVIC can fully drive the high-side IGBT. The Mini DIP SPM includes an under-voltage detection function for
the V BS to ensure that the HVIC does not drive the high-side IGBT, if the V BS voltage drops below a specified
voltage (refer to the datasheet). This function prevents the IGBT from operating in a high dissipation mode.
There are a number of ways in which the V BS floating supply can be generated. One of them is the
bootstrap method described here. This method has the advantage of being simple and inexpensive. However,
the duty cycle and on-time are limited by the requirement to refresh the charge in the bootstrap capacitor.
The bootstrap supply is formed by a combination of an bootstrap diode, resistor and capacitor as shown in
Figure 8.1. The current flow path of the bootstrap circuit is shown in Fig. 8.1. When V S is pulled down to
? 2008
FAIRCHILD SEMICONDUCTOR - Smart Power Module
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