STK57FU391A-E View Datasheet(PDF) - ON Semiconductor
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STK57FU391A-E Datasheet PDF : 16 Pages
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STK57FU391A-E
Usage Precautions
1. This H-IC includes bootstrap diode and resistors. Therefore, by adding a capacitor “CB”, a high side drive voltage is
generated; each phase requires an individual bootstrap capacitor. The recommended value of CB is in the range of 1
to 47μF, however this value needs to be verified prior to production. If selecting the capacitance more than 47μF
(±20%), connect a resistor (about 20Ω) in series between each 3-phase upper side power supply terminals (VB1,2,3)
and each bootstrap capacitor.
When not using the bootstrap circuit, each upper side pre-drive power supply requires an external independent
power supply.
2. It is essential that wirning length between terminals in the snubber circuit be kept as short as possible to reduce the
effect of surge voltages. Recommended value of “CS” is in the range of 0.1 to 10μF.
3. The “FLTEN” terminal (pins 31) is open Drain (It is operating as “FAULT” when becoming Low).This terminal
serves as the shut down function of the built-in pre-driver. Please make pulling up outside so that “FLTEN” terminal
voltages become more than 3V. (When the terminal voltage is above 3V, normalcy works, and it is shut down when
it is equal to or less than 0.8V). Moreover, thermistor built in between FLTEN(pins 31) and VSS(pins 35), so the
substrate temperature can be monitored according to the voltage divided by the thermistor and the pull-up resistor.
When the pull up voltage (VP) is at 5V, pull up resistor (RP) connects above 10kΩ, and in case of VP=15V, RP
connects above 39kΩ. The substrate temperature detection by the thermistor is for the substrate temperature monitor
in the state of regular operation and not for protection of HIC over-temperature. Moreover, it is not the one to
momentary heating-up, and partial heating-up.
4. The pull-down resistor is connected with the inside of the signal input terminal, however please connect the
pull-down resistor(about 2.2 to 3.3kΩ) outside to decrease the influence of the noise by wiring etc.
5. The over-current protection feature operates only when it is possible to do a circuit control normally. For safety,
recommend installation a fuse, and so on in the “Vcc” line.
6. Because the H-IC can be destroyed when the motor connection terminal (pin No.5, 9 and 13) is opened while the
motor is running, please be especially careful of the connection (soldering condition) of this terminal.
7. The “ITRIP” terminal (33pin) and the “PFCTRIP” terminal (32pin) are the input terminal of the built-in comparator.
It can stop movement by inputting the voltage more than reference voltage. (At the time of movement, usually those
terminals give it for the voltage less than reference voltage). Please use it as various protections such as the
over-current protection (feedback from external shunt resistance). In addition, the protection movement is not done
a latch of. After the protection movement end, It becomes the movement return state after 2ms (typ.). So, please do
the protection movement detection of all input signals in OFF (LOW) promptly afterward.
8. When input pulse width is less than 1.0us, an output may not react to the pulse. (Both ON signal and OFF signal)
This data shows the example of the application circuit, does not guarantee a design as the mass production set.
No.A2240-12/16
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