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Electrical Characteristics (MC7805A)LM7805A Symbol 符號 Conditions 條件 最小 典型 最大 單位 Output Voltage 輸出電壓 VO TJ =+25℃ 4.9 5 5.1 VIO =5mA to 1A, PO ≤ 15W VI =7.5V to 20V 4.8 5 5.2 Line Regulation 線性調整率 (Note1) Regline VI =7.5V to 25V IO =500mA 5 50 mVVI =8V to 12V -3 50 TJ =+25℃ VI=7.3V to 20V -5 50 VI=8V to 12V -1.5 25 Load Regulation 負載調整率 (Note1) Regload TJ =+25℃ IO =5mA to 1.5A -9 100 mVIO =5mA to 1A -9 100 IO =250mA to 750mA -4 50 Quiescent Current 靜態電流 IQ TJ =+25℃ -5.0 6 mA Quiescent Current Change 靜態電流變化 ΔIQ IO =5mA to 1A --0.5 mAVI =8 V to 25V, IO =500mA --0.8 VI =7.5V to 20V, TJ =+25℃ --0.8 Output Voltage Drift 輸出電壓漂移 ΔV/ΔT Io =5mA --0.8 -mV/℃ Output Noise Voltage 輸出噪聲電壓 VN f =10Hz to 100KHz TA =+25℃ -10 -μV/Vo Ripple Rejection 紋波抑制 RR f =120Hz, IO =500mA VI =8V to 18V -68 -dB Dropout Voltage 電壓差 VDrop IO =1A, TJ =+25℃ -2 -V Output Resistance 輸出電阻 rO f =1KHz -17 -mΩ Short Circuit Current 短路電流 ISC VI=35V, TA =+25℃ -250 -mA Peak Current 峰值電流 IPK TJ=+25℃ -2.2 -A三端穩壓集成電路極限參數： Parameter 參數 Symbol 符號 Value 單位 Input Voltage輸入電壓 (for VO =5V to 18V)VI 35 V (for VO =24V)VI 40 V Thermal Resistance Junction-Cases 熱阻(結到殼) (TO-220) RθJC 5 ℃/W Thermal Resistance Junction-Air熱阻(結到空氣) (TO-220) RθJA 65 ℃/W Operating Temperature Range工作溫度范圍 TOPR 0 ~ +125 ℃ Storage Temperature Range儲存溫度范圍 TSTG -65 ~ +150 ℃
圖1 78XX內部電路圖 圖2 78XX參照測試電路 圖3 外形引腳排列圖管腳圖
圖4 紋波抑制電路
圖5 負載調節控制電路
圖6 與79XX系列三端穩壓構成的正負對稱輸出電壓電路圖
圖9 D-PAK封裝圖 |
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