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MC78T12CT Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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MC78T12CT Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 8 page MC78TXX 3 Electrical Characteristics(MC78T12) (Continued) (VI = 19V, IO = 3.0 A, 0 °C ≤ TJ ≤ +125°C, Po ≤ PMAX (Note1), unless otherwise specified. ) Note: 1. Although power dissipation is internally limited, specifications apply only for PO ≤ Pmax, Pmax = 25W 2. Load and line regulation are specified at constant junction temperature. Change in Vo due heating effects must be taken into account separately. Pulse testing with low duty is used. ( PMAX = 25W) Parameter Symbol Conditions Min. Typ. Max. Unit Output Voltage Vo 5mA ≤ Io ≤ 3.0A , TJ =+25°C 14.5V ≤ VI ≤ 27V, 5mA ≤ Io ≤ 2.0A 11.5 11.4 12 12 12.5 12.8 V Line Regulation (Note2) ∆VO 14.5V ≤ VI ≤ 35V, Io=5mA, TJ =+25°C 14.5V ≤ VI ≤ 35V, Io=1.0A, TJ =+25°C 14.9V ≤ VI ≤ 28V, Io =2.0A, TJ =+25°C 16V ≤ VI ≤ 22V, Io =3.0A, TJ =+25°C -6.0 45 mV Load Regulation (Note2) ∆VO 5mA ≤ Io ≤ 3.0A, TJ =+25°C 5mA ≤ Io ≤ 3.0A - 10 15 30 80 mV mV Thermal Regulation REGT Pulse =10ms, P = 20W TA = +25 °C - 0.002 0.03 %Vo/W Quiescent Current IQ 5mA ≤ Io ≤ 3.0A, TJ =+25°C 5mA ≤ Io ≤ 3.0A - 3.5 4.0 5.0 6.0 mA mA Quiescent Current Change ∆IQ 14.5V ≤ VI ≤ 35V, Io = 5mA TJ =+25 °C ; 14.9V ≤ VI ≤ 27V, Io =2.0A ; 5mA ≤ Io ≤ 3.0A, TJ =+25°C -0.1 0.8 mA Ripple Rejection RR f = 120Hz, 15V ≤ VI ≤ 25V, Io = 2.0A TJ =+25 °C -67 - dB Dropout Voltage VD Io = 3A,TJ =+25 °C- 2.2 2.5 V Output Noise Voltage VN TA =+25 °C, 10Hz ≤ f ≤ 100kHz - 10 - µV/Vo Peak Output Current IPK TA =+25 °C- 5.0 - A Output Resistance Ro f = 1.0kHz - 2.0 - m Ω Short Circuit Current Limit Isc VI = 35V, TJ =+25 °C- 1.5 2.5 A Average Temperature Coefficient of Output Voltage ∆VO/∆T Io = 5.0mA - 0.5 - mV/ °C |
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