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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LM2587T-ADJ 데이터시트(PDF) 7 Page - Texas Instruments |
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LM2587T-ADJ 데이터시트(HTML) 7 Page - Texas Instruments |
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7 / 32 page  LM2587 www.ti.com SNVS115D – APRIL 2000 – REVISED APRIL 2013 LM2587-ADJ Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions Typical Min Max Units SYSTEM PARAMETERS Test Circuit of Figure 8(1) VOUT Output Voltage VIN = 4V to 10V 12.0 11.52/11.40 12.48/12.60 V ILOAD = 300 mA to 1.2A ΔVOUT/ Line Regulation VIN = 4V to 10V 20 100/200 mV ΔVIN ILOAD = 300 mA ΔVOUT/ Load Regulation VIN = 10V 20 100/200 mV ΔILOAD ILOAD = 300 mA to 1.2A η Efficiency VIN = 10V, ILOAD = 1A 90 % UNIQUE DEVICE PARAMETERS(2) VREF Output Reference Measured at Feedback Pin 1.230 1.208/1.205 1.252/1.255 V Voltage VCOMP = 1.0V ΔVREF Reference Voltage VIN = 4V to 40V 1.5 mV Line Regulation GM Error Amp ICOMP = −30 μA to +30 μA 3.200 1.800 6.000 mmho Transconductance VCOMP = 1.0V AVOL Error Amp VCOMP = 0.5V to 1.6V 670 400/200 V/V Voltage Gain RCOMP = 1.0 MΩ (3) IB Error Amp VCOMP = 1.0V 125 425/600 nA Input Bias Current (1) External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM2587 is used as shown in Figure 7 and Figure 8, system performance will be as specified by the system parameters. (2) All room temperature limits are 100% production tested, and all limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. (3) A 1.0 M Ω resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL. All Output Voltage Versions Electrical Characteristics (1) Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions Typical Min Max Units IS Input Supply Current (Switch Off) 11 15.5/16.5 mA See(2) ISWITCH = 3.0A 85 140/165 mA VUV Input Supply RLOAD = 100Ω 3.30 3.05 3.75 V Undervoltage Lockout fO Oscillator Frequency Measured at Switch Pin RLOAD = 100Ω 100 85/75 115/125 kHz VCOMP = 1.0V fSC Short-Circuit Measured at Switch Pin Frequency RLOAD = 100Ω 25 kHz VFEEDBACK = 1.15V VEAO Error Amplifier Upper Limit 2.8 2.6/2.4 V Output Swing See(3) Lower Limit 0.25 0.40/0.55 V See(2) IEAO Error Amp See(4) Output Current 165 110/70 260/320 μA (Source or Sink) (1) All room temperature limits are 100% production tested, and all limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. (2) To measure this parameter, the feedback voltage is set to a high value, depending on the output version of the device, to force the error amplifier output low. Adj: VFB = 1.41V; 3.3V: VFB = 3.80V; 5.0V: VFB = 5.75V; 12V: VFB = 13.80V. (3) To measure this parameter, the feedback voltage is set to a low value, depending on the output version of the device, to force the error amplifier output high. Adj: VFB = 1.05V; 3.3V: VFB = 2.81V; 5.0V: VFB = 4.25V; 12V: VFB = 10.20V. (4) To measure the worst-case error amplifier output current, the LM2587 is tested with the feedback voltage set to its low value (specified in Note 7) and at its high value (specified in Note 8). Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM2587 |
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