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TA7291AF Datasheet(PDF) 9 Page - Toshiba Semiconductor |
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TA7291AF Datasheet(HTML) 9 Page - Toshiba Semiconductor |
9 / 14 page TA7291AP/AS(J)/AF 2003-02-14 9 Notes · Power On/Off At power on, VCC must be applied simultaneously or before VS. At power off, VCC must be removed simultaneously or after VS. · Input Circuit A logic high on the VIN pin activates the input circuit as shown in the figure. When a voltage greater than or equal to VIN (high) is applied to the pin, the circuit is active. When a voltage less than or equal to VIN (low) is applied to the pin or the pin is grounded, the circuit is inactive. When the pin is high, the input current IIN flows into the input circuit. So, be careful about the output impedance of the first stage. The input hysteresis is 0.7 V (typ.). At power on (VCC), set both input pins IN1 and IN2 to low. · Output Circuit Output high voltage · Operation based on the Vref voltage The Vref voltage is increased by twice the value of VBE (small signal) in the Vref circuit. Then, the voltage is applied to the base A of Q2 (power transistor 2). As a result, the voltage which is reduced by the value of VBE (Q2) appears on the VOUT pin. VOUT = Vref + 2VBE-VBE (Q2) ~- Vref + 0.7 V · Vref pin The Vref pin must not be left open when unused. In this case, connect it via a protection resistor (3 kW or more) to the VS pin. Otherwise, it might cause oscillation. Vref must be £ VS. Protection Features Overcurrent Protection Circuit The overcurrent protection circuit detects a current flowing through the upper power transistor. If the current exceeds a predetermined value (about 2.5 A), the circuit turns all the power transistors off. However, it does not always prevent overcurrent. If an output pin is shorted or grounded, the IC might be destroyed before operation of the overcurrent protection circuit. So, be sure to connect a resistor or fuse to the power supply (VS) line. (See “Application Circuit.”) Thermal Shutdown Circuit If the chip temperature exceeds a predetermined limit (about 170°C), the thermal shutdown circuit turns all the power transistors off. or VIN 6/1/9 5/9/7 1 k W 1/5/1 VIN 5 k W VCC standby TA7291AP/TA7291AS (J)/TA7291AF or A 1/5/1 VOUT Q1 10/3/13 2/7/4 4/8/5 8/6/15 Vref Vref circuit Q2 TA7291AP/TA7291AS (J)/TA7291AF |
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