SNVS121E May   1996  – May 2019 LM2586

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Typical Applications
  3. 3 Description
    1.     Device Images
      1.      Block Diagram
  4. 4 Revision History
  5. 5 Pin Configurations
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Ratings
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics: 3.3 V
    6. 6.6 Electrical Characteristics: 5 V
    7. 6.7 Electrical Characteristics: 12 V
    8. 6.8 Electrical Characteristics: Adjustable
    9. 6.9 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Flyback Regulator Operation
      2. 7.3.2 Step-Up (Boost) Regulator Operation
      3. 7.3.3 Programming Output Voltage (Selecting R1 And R2)
      4. 7.3.4 Shutdown Control
      5. 7.3.5 Frequency Adjustment
      6. 7.3.6 Frequency Synchronization
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Typical Flyback Regulator Applications
        1. 8.2.1.1 Design Requirements
          1. 8.2.1.1.1 Transformer Selection (T)
          2. 8.2.1.1.2 Transformer Footprints
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 8.2.1.2.2 Flyback Regulator Input Capacitors
          3. 8.2.1.2.3 Switch Voltage Limits
          4. 8.2.1.2.4 Output Voltage Limitations
          5. 8.2.1.2.5 Noisy Input Line Condition
          6. 8.2.1.2.6 Stability
      2. 8.2.2 Typical Boost Regulator Applications
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
    3. 8.3 System Examples
      1. 8.3.1 Test Circuits
  9. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  10. 10Heat Sink/Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
        1. 11.1.2.1 Custom Design With WEBENCH® Tools
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.8 Electrical Characteristics: Adjustable

PARAMETER TEST CONDITIONS TYP MIN MAX UNIT
SYSTEM PARAMETERS Test Circuit of Figure 55(1)
VOUT Output Voltage VIN = 4V to 10V
ILOAD = 0.2A to 0.8A		 12.0 11.52/11.40 12.48/12.60 V
ΔVOUT/
ΔVIN 		Line Regulation VIN = 4V to 10V
ILOAD = 0.2A		 20 100/200 mV
ΔVOUT/
ΔILOAD 		Load Regulation VIN = 10V
ILOAD = 0.2A to 0.8A		 20 100/200 mV
η Efficiency VIN = 10V, ILOAD = 0.6A 93 %
UNIQUE DEVICE PARAMETERS (2)
VREF Output Reference
Voltage		 Measured at Feedback Pin
VCOMP = 1.0V		 1.230 1.208/1.205 1.252/1.255 V
ΔVREF Reference Voltage
Line Regulation		 VIN = 4V to 40V 1.5 mV
GM Error Amp
Transconductance		 ICOMP = −30 μA to +30 μA
VCOMP = 1.0V		 3.200 1.800 6.000 mmho
AVOL Error Amp Voltage Gain VCOMP = 0.5V to 1.6V,
RCOMP = 1.0 MΩ (3) 		670 400/200 V/V
IB Error Amp
Input Bias Current		 VCOMP = 1.0V 125 425/600 nA
COMMON DEVICE PARAMETERS for all versions (2)
IS Input Supply Current Switch Off (5) 11 15.5/16.5 mA
ISWITCH = 1.8A 50 100/115 mA
IS/D Shutdown Input
Supply Current		 VSH = 3V 16 100/300 μA
VUV Input Supply
Undervoltage Lockout		 RLOAD = 100Ω 3.30 3.05 3.75 V
fO Oscillator Frequency Measured at Switch Pin
RLOAD = 100Ω, VCOMP = 1.0V
Freq. Adj. Pin Open (Pin 1)		 100 85/75 115/125 kHz
RSET = 22 kΩ 200 kHz
fSC Short-Circuit
Frequency		 Measured at Switch Pin
RLOAD = 100Ω
VFEEDBACK = 1.15V		 25 kHz
VEAO Error Amplifier
Output Swing		 Upper Limit (4) 2.8 2.6/2.4 V
Lower Limit (5) 0.25 0.40/0.55 V
IEAO Error Amp
Output Current
(Source or Sink)		 See (6) 165 110/70 260/320 μA
ISS Soft Start Current VFEEDBACK = 0.92V
VCOMP = 1.0V		 11.0 8.0/7.0 17.0/19.0 μA
DMAX Maximum Duty Cycle RLOAD = 100Ω  (4) 98% 93%/90%
IL Switch Leakage
Current		 Switch Off
VSWITCH = 60V		 15 300/600 μA
VSUS Switch Sustaining Voltage dV/dT = 1.5V/ns 65 V
VSAT Switch Saturation Voltage ISWITCH = 3.0A 0.45 0.65/0.9 V
ICL NPN Switch Current Limit 4.0 3.0 7.0 A
VSTH Synchronization
Threshold Voltage		 FSYNC = 200 kHz
VCOMP = 1V, VIN = 5V		 0.75 0.625/0.40 0.875/1.00 V
ISYNC Synchronization
Pin Current		 VIN = 5V
VCOMP = 1V, VSYNC = VSTH 		100 200 μA
VSHTH ON/OFF Pin (Pin 1)
Threshold Voltage		 VCOMP = 1V
(7) 		1.6 1.0/0.8 2.2/2.4 V
ISH ON/OFF Pin (Pin 1)
Current		 VCOMP = 1V
VSH = VSHTH 		40 15/10 65/75 μA
(1) External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM2586 is used as shown in Figure 54 and Figure 55, 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 MΩ resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL.
(4) 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 and the switch on.
(5) 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 and the switch off.
(6) To measure the worst-case error amplifier output current, the LM2586 is tested with the feedback voltage set to its low value (Note 4) and at its high value (Note 5).
(7) When testing the minimum value, do not sink current from this pin—isolate it with a diode. If current is drawn from this pin, the frequency adjust circuit will begin operation (Figure 25).