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LM2577T-ADJ Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM2577T-ADJ Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 27 page Electrical Characteristics — LM1577-12, LM2577-12 (Continued) Specifications with standard type face are for T J = 25˚C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, V IN = 5V, and ISWITCH = 0. LM1577-12 LM2577-12 Units Symbol Parameter Conditions Typical Limit Limit (Limits) (Notes 3, 4) (Note 5) DEVICE PARAMETERS Error Amplifier Upper Limit 2.4 V Output Swing V FEEDBACK = 10.0V 2.2/2.0 2.2/2.0 V(min) Lower Limit 0.3 V V FEEDBACK = 15.0V 0.40/0.55 0.40/0.55 V(max) Error Amplifier V FEEDBACK = 10.0V to 15.0V ±200 µA Output Current V COMP = 1.0V ±130/±90 ±130/±90 µA(min) ±300/±400 ±300/±400 µA(max) I SS Soft Start Current V FEEDBACK = 10.0V 5.0 µA V COMP = 0V 2.5/1.5 2.5/1.5 µA(min) 7.5/9.5 7.5/9.5 µA(max) D Maximum Duty Cycle V COMP = 1.5V 95 % I SWITCH = 100 mA 93/90 93/90 %(min) Switch Transconductance 12.5 A/V I L Switch Leakage V SWITCH = 65V 10 µA Current V FEEDBACK = 15V (Switch Off) 300/600 300/600 µA(max) V SAT Switch Saturation I SWITCH = 2.0A 0.5 V Voltage V COMP = 2.0V (Max Duty Cycle) 0.7/0.9 0.7/0.9 V(max) NPN Switch 4.5 A Current Limit 3.7/3.0 3.7/3.0 A(min) 5.3/6.0 5.3/6.0 A(max) Electrical Characteristics — LM1577-15, LM2577-15 Specifications with standard type face are for T J = 25˚C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, V IN = 5V, and ISWITCH = 0. LM1577-15 LM2577-15 Units Symbol Parameter Conditions Typical Limit Limit (Limits) (Notes 3, 4) (Note 5) SYSTEM PARAMETERS Circuit of Figure 2 (Note 6) V OUT Output Voltage V IN = 5V to 12V 15.0 V I LOAD = 100 mA to 600 mA 14.50/14.25 14.50/14.25 V(min) (Note 3) 15.50/15.75 15.50/15.75 V(max) Line Regulation V IN = 3.5V to 12V 20 50/100 50/100 mV I LOAD = 300 mA mV(max) Load Regulation V IN = 5V 20 50/100 50/100 mV I LOAD = 100 mA to 600 mA mV(max) η Efficiency V IN = 5V, ILOAD = 600 mA 80 % DEVICE PARAMETERS I S Input Supply Current V FEEDBACK = 18.0V 7.5 mA (Switch Off) 10.0/14.0 10.0/14.0 mA(max) I SWITCH = 2.0A 25 mA V COMP = 2.0V 50/85 50/85 mA(max) (Max Duty Cycle) V UV Input Supply I SWITCH = 100 mA 2.90 V www.national.com 3 |
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