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TB6549PG Datasheet(PDF) 10 Page - Toshiba Semiconductor |
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TB6549PG Datasheet(HTML) 10 Page - Toshiba Semiconductor |
10 / 22 page TB6549F/FG/P/PG/HQ 2007-3-6 10 6. VCC Power Supply Section • The VCC power supply delivers a voltage to the output circuit, charge pump circuit, and internal 5 V circuit. • The operating voltage range is shown below: VCC (opr.) = 10 to 27 V • This IC has a power monitoring function for preventing an output malfunction on power-up. However, Toshiba recommends that IN1, IN2, and SB be set to the Low level at power-on. 7. GND Sections • This IC includes two separate GND sections: S-GND for controlling and P-GND for outputting. Be sure to short-circuit these two GNDs as close to TB6549 as possible. 8. Power Monitoring Circuit • This circuit turns the output OFF when Vreg becomes 3.0 V (design target value) or less. At this time, VCC = 4.6 V (typ.). • With a hysteresis of 0.3 V (design target value), the output turns back ON when Vreg exceeds 3.3 V (design target value) after this circuit starts operating. 9. Thermal Shutdown (TSD) Circuit This IC includes a thermal shutdown circuit, which turns the output OFF when the junction temperature (Tj) exceeds 160°C (typ.). The output turns back ON automatically. The thermal hysteresis is 20°C. TSD = 160°C (design target value) ΔTSD = 20°C (design target value) 10. Overcurrent Detection (ISD) Circuit This IC includes a circuit to detect current flowing through the output power transistors. The current limit is set to 5 A (typ.). The circuit detects a current flowing through each of the four output power transistors. If the current in any one output power transistor exceeds the set limit, this circuit turns all the outputs OFF. This circuit includes a timer that causes the outputs to be OFF for 50 μs (typ.) after detection of an overcurrent and then turn back ON automatically. If the overcurrent continues to flow, this ON-OFF operation is repeated. Note that to prevent a malfunction due to a glitch, an insensitive period of 10 μs (typ.) is provided. The set limit is 5 A (typ.) as a design target value. The distributions shown below exist because of the variations in thermal characteristics of different ICs. These distributions should be fully considered in the motor torque design. Also, output peak current should be less than 3 A because of the variations below, Detected current: Approximately from 3.5 to 6.5 A ILIM 50 μs (typ.) 0 10 μs (typ.) Insensitive period 50 μs (typ.) 10 μs (typ.) Output Current |
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