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LB1948MC-AH Datasheet(PDF) 6 Page - ON Semiconductor |
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LB1948MC-AH Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 8 page LB1948MC www.onsemi.com 6 Design Documentation (1) Voltage magnitude relationship There are no restrictions on the magnitude relationships between the voltages applied to VCC and IN1 to IN4. (2) Parallel connection The LB1948MC can be used as a single-channel H-bridge power supply by connecting IN1 to IN3, IN2 to IN4, OUT1 to OUT3, and OUT2 to OUT4 as shown in the figure. (IOmax = 1.6A, VO(sat) = 0.6V (typical) at IO = 800mA) 1VCC 2 IN1 3 IN2 4 IN3 5 IN4 10 9 8 7 6 OUT1 OUT2 OUT3 OUT4 GND LB1948MC M (3) Observe the following points when designing the printed circuit board pattern layout. Make the VCC and ground lines as wide and as short as possible to lower the wiring inductance. Insert bypass capacitors between VCC and ground mounted as close as possible to the IC. Resistors of about 10K must be inserted between the CPU output ports and the IN1 to IN4 pins if the microcontroller and the LB1948MC are mounted on different printed circuit boards and the ground potentials differ significantly. (4) Penetration electric current At the time of the next mode shift, a penetration electric current is generated in VCC-GND. There are not the deterioration of the IC by), the destruction as follows 1Atyp per this penetration electric current (1ch, 1μs; but for the stabilization of the power supply line of the IC is most recent, and, please can enter with a condenser. (i) Forward (Reverse) ↔ Brake (ii)Forward ↔ Reverse (iii) Standby → Brake In addition, the penetration electric current disappears when I put a wait mode of 10μs at the time of the change of the Forward ↔ Reverse. (5) Supplementary matter of the penetration electric current According to (4), a penetration electric current cannot influence IC life. Thermal Shutdown Temperature (1) Thermal shutdown temperature The thermal shutdown temperature Ttsd is 200 20C with fluctuations. (2) Thermal shutdown operation The operation of the thermal shutdown circuit is shown in the figure below. When the chip temperature Tj is in the direction of increasing (solid line), the output turns off at approximately 200 C. When the chip temperature Tj is in the direction of decreasing (dotted line), the output turns on (returns) at approximately 125 C. 100 120 140 160 180 200 220 0 14 12 10 8 6 4 2 VCC=12V 100 C 220 C 220 C 100 C Return TSD operation Chip temperature, Tj -- C LB1948MC Thermal shutdown reference chart |
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