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STK433-030-E Fiches technique(PDF) 9 Page - Sanyo Semicon Device |
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STK433-030-E Fiches technique(HTML) 9 Page - Sanyo Semicon Device |
9 / 11 page STK433-030-E No. A1247-9/11 STK433-000 Series Application Explanation The protection circuit application for the STK433-000sr consists of the following blocks (blocks (1) to (4)). (1) Standby control circuit block (2) Load short-circuit detection block (3) Latch-up circuit block (4) DC voltage protection block 1) Standby control circuit block Concerning pin 13 reference voltage VST <1> Operation mode The switching transistor of the predriver IC turns on when the pin 13 reference voltage, VST, becomes greater than or equal to 2.5V, placing the amplifier into the operation mode. Example: When VST (min.) = 2.5V I1 is approximately equal to 0.40mA since VST = (*2) × IST + 0.6V → 2.5V = 4.7kΩ × IST + 0.6V. <2> Standby mode The switching transistor of the predriver IC turns off when the pin 13 reference voltage, VST, becomes lower than or equal to 0.6V (typ. 0V), placing the amplifier into the standby mode. Example: When VST = 0.6V I1 is approximately equal to 0mA since VST = (*2) × IST + 0.6V → 0.6V = 4.7kΩ × IST + 0.6V. (*1) Limiting resistor Determine the value of R1 so that the voltage VST applied to the standby pin (pin 13) falls within the rating (+2.5V to 5.5V (typ. 3.0V)). (*2) The standby control voltage must be supplied from the host including microcontrollers. (*3) A 4.7k Ω limiting resistor is also incorporated inside the hybrid IC (at pin 13). 2 3 4 5 6 7 8 9 10 11 12 13 14 1 15 OUT Ch1 STK433-000 series 56k Ω I1 +VCC Ch1 IN Ch1 NF Ch2 IN Ch2 NF Ch2 OUT(-) Ch1 OUT(+) -VCC SUB GND +PRE ST-BY Ch1 OUT(-) Ch2 OUT(+) -PRE 6.8k Ω 56k Ω 6.8k Ω (2) Load short detection part 22k Ω 56k Ω 1k Ω 0.1 μF10kΩ 100k Ω 1k Ω 33k Ω 2k Ω (*1) R1 ex) 5.1k Ω 33 μF OUT Ch2 82k Ω 82k Ω 100 k Ω 22 μF 22 μF 1) Stand-by control circuit part H: Operation mode (+5V) L: Stand-by mode (0V) Point.B Point.B Point.C Point.C Tr1 Tr2 Stand-by Circuit in Pre Driver IC SW transistor ΔVBE 4.7k Ω (*3) Stand-By Control Voltage VST (*4) R2 I2 I3 Operate mode (VSTOFF) ≥ 2.5V Stand-By mode (VSTON) < 0.6V (0V typ) (3) Latch-up circuit part (4) DC offset protection Tr4 Tr5 Tr3 Tr5 Tr6 -VCC |
Numéro de pièce similaire - STK433-030-E |
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Description similaire - STK433-030-E |
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