＜M F T＞ Preliminary RT8H052C *This is tentative specification. The over current protection of three shunt method OUTLINE DRAWING Unit：mm 0.65 ① ⑥ ② ⑤ ③ ④ 1.2 0～0.1 APPLICATION The over current protection of three shunt method. 0.33 0.95 2.8 1.50 0.81 1.1 FEATURES ● Miniaturization of a set. ● Variable VREF by external resistance. ● Open collector output. 1.9 0.65 2.80 DESCRIPTION RT8H052C is composed by NPN transistors, PNP transistors and resistors. It can miniaturization of a set and reduce parts or time necessary for completion. This MFT composed the circuit for the over current protection of three shunt method. PIN CONFIGURATION 6 １ 5 2 4 ①IN1 ②IN2 ③IN3 ④VREF ⑤GND ⑥VCC 3 BLOCK DIAGRAM IN1 IN2 IN3 VREF VCC GND 110427 （1/4） ＜M F T＞ Preliminary RT8H052C *This is tentative specification. The over current protection of three shunt method ABSOLUTE MAXIMUM RATINGS (Ta＝25℃) Symbol Parameter Vcc Ratings Unit Supply voltage 12 V Pd Internal power dissipation 200 mW Kθ Thermal derating 1.6 mW/℃ Tj Junction temperature 150 ℃ Tstg Storage temperature (keep dry) -40～150 ℃ Topr Operating temperature Tj (keep dry) -30～150 ℃ Designed value Min Typ Max Unit Conditions Ta≧25℃ ELECTRICAL CHARACTERISTIC (Ta=25℃,VCC=5V unless otherwise noted.) Symbol Parameter Vcc Operating supply voltage range Test conditions 3 5 10 V ICC_off Circuit current of off states IN1=IN2=IN3=0V、VREF=0.5V 0.2 mA ICC_on Circuit current of on states IN1=1V、IN2=IN3=0V、VREF=0.5V 2.9 mA VINCM Common mode input voltage range VIN1th IN1 threshold voltage VREF=0.5V、IN2=IN3=0V 0.5 V VIN2th IN2 threshold voltage VREF=0.5V、IN1=IN3=0V 0.5 V VIN3th IN3 threshold voltage VREF=0.5V、IN1=IN2=0V 0.5 V 0.3 - VCC-0.8 V 110427 （2/4） ＜M F T＞ Preliminary RT8H052C *This is tentative specification. The over current protection of three shunt method DIP-IPM APPLICATION CIRCUIT EXAMPLES Highside Driver MCU M Lowside Driver R8 C1 IN1 R1 Q1 R5 C2 R9 R10 R6 C3 IN2 IN3 VCC R7 VREF R3 V1 R4 R2 GND MFT OPERATING EXPLANATION This MFT have VREF terminal ,so the threshold voltage can be freely set by external connected resistance. MFT doesn't have the output terminal for six pins MFT(VCC,GND,VREF,IN1,IN2,IN3). The terminal VCC uses two functions of the power-supply voltage terminal and the output terminal. The circuit current flows about 200uA, when the threshold voltage does not get over than neither of IN1～IN3 setting of VREF. When the voltage of VREF(V) or more is impressed to either of terminal of IN1～IN3, it enters the state of detection, the circuit current flows to VCC becomes about 2.9mA. By using the characteristic of this circuit current, the output signal can be made by connecting the PNP transistor outside. The output terminal is the collector terminal of the Q1:PNP transistor. At the usual state, the PNP transistor is turning off and output Low. At the detecting state, the PNP transistor is turning on and output High. SELECTION OF PARTS How to select the resistance at above application circuit example. Resistance R1 connected between emitter bases of the Q1:PNP transistor is set to turn on the PNP transistor when the PNP transistor is usually turned off in the circuit current in the state, and the detected circuit current flows about MFT. please set resistance R1 at rage 390Ω～1.5kΩ. The current thrown into the Q1:PNP transistor is adjusted by resistance R2 between collectors GND. Calculation formula, if making VREF from resistance. VREF(V)=R4/(R3+R4)*V1 R5, R6, and R7 are the shunt resistance. R8, R9, R10, C1, C2, and C3 are noise filters. Please connect it if necessary. The above value is a theory value. Please set it after an enough evaluation. 110427 （3/4） ＜M F T＞ Preliminary RT8H052C *This is tentative specification. The over current protection of three shunt method THERMAL DERATING POWER DISSIPATION Pd[ｍW] 250 200 150 100 50 0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE Ta [℃] 110427 （4/4） 6-41 Tsukuba, Isahaya, Nagasaki, 854-0065 Japan Keep safety first in your circuit designs! ·ISAHAYA Electronics Corporation puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal injury, fire or property damage. Remember to give due consideration to safety when making your circuit designs, with appropriate measures such as (1) placement of substitutive, auxiliary, (2) use of non-farmable material or (3) prevention against any malfunction or mishap. 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