Electrical Characteristics 电气特性 (MC7908)
(VI = -14V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)

Parameter 参数 Symbol 符号 Conditions 条件 最小. 典型. 最大. 单位 Output Voltage 输出电压 VO TJ=+25℃ - 7.7 - 8 - 8.3 V IO = 5mA to 1A, PO ≤ 15W VI = -10V to -23V - 7.6 - 8 - 8.4 Line Regulation 线性调整率(Note1) ΔVO TJ=+25℃ VI = -10.5V to -25V - 10 100 mV VI = -11V to -17V - 5 80 Load Regulation 负载调整率(Note1) (Note1) ΔVO TJ=+25℃ IO = 5mA to 1.5A - 12 160 mV TJ =+25℃ IO = 250mA to 750mA - 4 80 Quiescent Current 静态电流 IQ TJ =+25℃ - 3 6 mA Quiescent Current Change 静态电流变化 ΔIQ IO = 5mA to 1A - 0.05 0.5 mA VI = -11.5V to -25V - 0.1 1 Temperature Coefficient of VD 温度系数 ΔVo/ΔT IO = 5mA - -0.6 - mV/℃ Output Noise Voltage 输出噪声电压 VN f = 10Hz to 100KHz TA =+25℃ - 175 - μV Ripple Rejection 纹波抑制 RR f = 120Hz ΔVI = 10V 54 60 - dB Dropout Voltage 电压差 VD TJ=+25℃ IO = 1A - 2 - V Short Circuit Current 短路电流 ISC TJ =+25℃, VI = -35V - 300 - mA Peak Current 峰值电流   IPK TJ =+25℃ - 2.2 - A

三端稳压集成电路极限参数： Parameter 参数 Symbol 符号 Value 单位 Input Voltage输入电压 (for VO =5V to 18V)VI 35 V (for VO =24V)VI 40 V Thermal Resistance Junction-Cases  热阻(结到壳) (TO-220) RθJC 5 ℃/W Thermal Resistance Junction-Air热阻(结到空气) (TO-220) RθJA 65 ℃/W Operating Temperature Range工作温度范围 TOPR 0 ~ +125 ℃ Storage Temperature Range储存温度范围 TSTG -65 ~ +150 ℃

                                           图1 79XX内部电路图

图2  外形引脚排列图管脚图                      图3 79XX参照测试电路及典型电路

                          图4 输出电压                                    图5 负载调节率曲线图

                图6 电压差曲线图                                        图7 静态电流曲线图

                  图8 短路电流曲线图

              图9 与78XX系列三端稳压构成的正负对称输出电压应用电路图

                        图10 TO-220封装图片