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TA7289F Datasheet(PDF) 5 Page - Toshiba Semiconductor |
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TA7289F Datasheet(HTML) 5 Page - Toshiba Semiconductor |
5 / 19 page TA7289P/F/FG 2006-3-2 5 Sawtooth OSC circuit consists of Q1 through Q4 and R1 through R3. R1 and R2 are voltage divider of 5 V build−in regulator. Q1 is turned “off” when V4 is less than the voltage of 2.5 V + VBE Q4 + VBE Q3 approximately equal to 3.8 V. V4 is increased by C1 charging of I4. Q1 and Q2 are turned “ON” when V4 becomes V4 − H level. Lower level of V4 (V4 − L) is equal to VBE Q4 + VBE Q3 + VSAT Q1 approximately equal to 1.5 V. V4 is calculated by following equation. V4 = 5·(1 − e − 3 1·R C 1 ·t) .................................................(1) Assuming that V4 = 1.5 V (t = t1) and=3.8 V (t = t2). C1 is external capacitance connected to Pin (4) (or (5)) and R3 is on−chip 20 kΩ resistor. Therefore, OSC frequency is calculated as follows. t1 = −C1·R3·1n (1 − 5 1.5 ) ................................................(2) t2 = −C1·R3·1n (1 − 5 3.8 )................................................(3) fOSC = 2 1 t t 1 − )) 5 3.8 (1 ·1n R ) 5 1.5 (1 ·1n R ( · C 1 3 3 1 − − − = = F) is C of (Unit (kHz) C 21.4 1 1 1 µ ABSOLUTE MAXIMUM RATINGS (Ta = 25°C) CHARACTERISTIC SYMBOL RATING UNIT VCC 30 Supply Voltage Vref 30 VIN 7 Reference Voltage VI 2 V TA7289P 1.5 TA7289F/FG IO (MAX.) 0.8 TA7289P 0.7 Output Current TA7289F/FG IO (AVE.) 0.3 A TA7289P 2.3 Power Dissipation TA7289F/FG PD (Note) 1.0 W Operating Temperature Topr −30~85 °C Storage Temperature Tstg −55~150 °C Note: NO HEAT SINK |
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