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LM2577M-12 Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM2577M-12 Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 27 page Electrical Characteristics — LM1577-ADJ, LM2577-ADJ 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, VFEEDBACK = VREF, and ISWITCH = 0. LM1577-ADJ LM2577-ADJ Units Symbol Parameter Conditions Typical Limit Limit (Limits) (Notes 3, 4) (Note 5) SYSTEM PARAMETERS Circuit of Figure 3 (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) ∆V OUT/ Line Regulation V IN = 3.5V to 10V 20 mV ∆V IN I LOAD = 300 mA 50/100 50/100 mV(max) ∆V OUT/ Load Regulation V IN = 5V 20 mV ∆I LOAD 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 = 1.5V (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 Reference Measured at Feedback Pin V Voltage V IN = 3.5V to 40V 1.230 1.214/1.206 1.214/1.206 V(min) V COMP = 1.0V 1.246/1.254 1.246/1.254 V(max) ∆V REF/ Reference Voltage V IN = 3.5V to 40V 0.5 mV ∆V IN Line Regulation I B Error Amp V COMP = 1.0V 100 nA Input Bias Current 300/800 300/800 nA(max) G M Error Amp I COMP = −30 µA to +30 µA 3700 µmho Transconductance V COMP = 1.0V 2400/1600 2400/1600 µmho(min) 4800/5800 4800/5800 µmho(max) A VOL Error Amp V COMP = 1.1V to 1.9V 800 V/V Voltage Gain R COMP = 1.0 MΩ (Note 7) 500/250 500/250 V/V(min) Error Amplifier Upper Limit 2.4 V Output Swing V FEEDBACK = 1.0V 2.2/2.0 2.2/2.0 V(min) Lower Limit 0.3 V V FEEDBACK = 1.5V 0.40/0.55 0.40/0.55 V(max) Error Amp V FEEDBACK = 1.0V to 1.5V ±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 = 1.0V 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) ∆I SWITCH/ Switch 12.5 A/V ∆V COMP Transconductance www.national.com 5 |
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