Datasheet STK984-090A-E (ON Semiconductor) - 9

STK984-090A-E
APPLICATIONS INFORMATION
Functional Description Operation in over-temperature conditions Table 2 shows the truth table for the normal operating
mode. The truth table shows the U output which is
controlled by the HINU and LINU inputs. The truth
tables for the V and W outputs follow the same rules.
The input signals are active HIGH. The RESET signal
is active LOW. Table 4 shows the truth table for over-temperature
operating conditions.
Input An internal pull-down resistor (100k typical) is
connected to each input signal terminal. If an
additional external pull-down resistor is used, it is
important to ensure the input voltage threshold
requirements are still met.
Input Output LINU RESET U DIAG1 DIAG2 L L H OFF L L Output OFF L H H L L L Lo Side ON H L H H L L Hi Side ON H H H OFF L L Output OFF X X L OFF H H Output OFF Operation
Mode HINU LINU RESET U DIAG1 DIAG2 X X H OFF L H Over
Temperature
Protection
Operating X X L OFF H H Output OFF Table 4: Truth Table Over-temperature Protection
Operation in undervoltage conditions Table 5 shows the truth table for low voltage protection
operating conditions. Operation
Mode HINU Output Input Output Operation
Mode HINU LINU RESET U DIAG1 DIAG2 X X H OFF L L Low voltage
Protection
Operating X X L OFF H H Output OFF Table 5: Truth Table Low Voltage Protection Table 2: Truth Table Normal Operating Mode Operation in over-voltage conditions Table 6 shows the truth table for over-voltage
operating conditions. Operation in over-current and short-circuit
conditions Table 3 shows the truth table for over-current and
short-circuit protection operating conditions for the U
output which is controlled by the HINU and LINU
inputs. The truth tables for the V and W outputs follow
the same rules.
Over-current protection is activated only if LINU,
LINV and LINW are in the high state. Short-circuit
protection is activated only if LINU, LINV and LINW
are in the low state. Input Output Operation
Mode HINU LINU RESET U DIAG1 DIAG2 X X H OFF L L Over
Voltage
Protection
Operating X X L OFF H H Output OFF Table 6: Truth Table Over-Voltage Protection
DIAG Outputs Input Output HINU LINU RESET U DIAG1 DIAG2 L L H OFF L L L H H L H L Terminal DIAG1 and DIAG2 are open drain outputs. A
pull-up resistor of 4.7k for a 5V power supply is
recommended. Operation
Mode
Output OFF
Over
Current
Protection
Operating
ShortCircuit
Protection
Operating H L H H H L H H H OFF L L Output OFF L/H L/H L OFF H H Output OFF Layout Voltage ringing due to stray inductance, especially in
the power source wiring between VB1 and PG, will
occur during switching. Use layout techniques such as
short traces and wide traces to minimize the inductance
of the power loop. Further, a high frequency capacitor
needs to be placed very close to the terminals VB1 and
PG, in addition to the electrolytic bulk capacitor. Table 3:Truth Table Over-current and Short-circuit
Protection Modes System level fuse A system level fuse in the VB1 power line is
recommend to ensure a fail-safe design. www.onsemi.com 9