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LM2577 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM2577 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 31 page Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 45V Output Switch Voltage 65V Output Switch Current (Note 2) 6.0A Power Dissipation Internally Limited Storage Temperature Range −65˚C to +150˚C Lead Temperature (Soldering, 10 sec.) 260˚C Maximum Junction Temperature 150˚C Minimum ESD Rating (C = 100 pF, R = 1.5 k Ω)2 kV Operating Ratings Supply Voltage 3.5V ≤ V IN ≤ 40V Output Switch Voltage 0V ≤ V SWITCH ≤ 60V Output Switch Current I SWITCH ≤ 3.0A Junction Temperature Range LM1577 −55˚C ≤ T J ≤ +150˚C LM2577 −40˚C ≤ T J ≤ +125˚C Electrical Characteristics—LM1577-12, LM2577-12 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) SYSTEM PARAMETERS Circuit of Figure 1 (Note 6) V OUT Output Voltage V IN = 5V to 10V 12.0 V I LOAD = 100 mA to 800 mA 11.60/11.40 11.60/11.40 V(min) (Note 3) 12.40/12.60 12.40/12.60 V(max) Line Regulation V IN = 3.5V to 10V 20 mV I LOAD = 300 mA 50/100 50/100 mV(max) Load Regulation V IN =5V 20 mV I LOAD = 100 mA to 800 mA 50/100 50/100 mV(max) η Efficiency V IN = 5V, ILOAD = 800 mA 80 % DEVICE PARAMETERS I S Input Supply Current V FEEDBACK = 14V (Switch Off) 7.5 mA 10.0/14.0 10.0/14.0 mA(max) I SWITCH = 2.0A 25 mA V COMP = 2.0V (Max Duty Cycle) 50/85 50/85 mA(max) V UV Input Supply I SWITCH = 100 mA 2.90 V Undervoltage Lockout 2.70/2.65 2.70/2.65 V(min) 3.10/3.15 3.10/3.15 V(max) f O Oscillator Frequency Measured at Switch Pin 52 kHz I SWITCH = 100 mA 48/42 48/42 kHz(min) 56/62 56/62 kHz(max) V REF Output Reference Measured at Feedback Pin V Voltage V IN = 3.5V to 40V 12 11.76/11.64 11.76/11.64 V(min) V COMP = 1.0V 12.24/12.36 12.24/12.36 V(max) Output Reference V IN = 3.5V to 40V 7mV Voltage Line Regulator R FB Feedback Pin Input 9.7 k Ω Resistance G M Error Amp I COMP = −30 µA to +30 µA 370 µmho Transconductance V COMP = 1.0V 225/145 225/145 µmho(min) 515/615 515/615 µmho(max) www.national.com 4 |
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