ZHCSM35F January   2007  – May 2021 LM5002

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 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 High Voltage VCC Regulator
      2. 7.3.2 Oscillator
      3. 7.3.3 External Synchronization
      4. 7.3.4 Enable and Standby
      5. 7.3.5 Error Amplifier and PWM Comparator
      6. 7.3.6 Current Amplifier and Slope Compensation
      7. 7.3.7 Power MOSFET
    4. 7.4 Device Functional Modes
      1. 7.4.1 Thermal Protection
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 VIN
      2. 8.1.2 SW PIN
      3. 8.1.3 EN or UVLO Voltage Divider Selection
      4. 8.1.4 Soft Start
    2. 8.2 Typical Applications
      1. 8.2.1 Non-Isolated Flyback Regulator
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Switching Frequency
          2. 8.2.1.2.2 Flyback Transformer
          3. 8.2.1.2.3 Peak MOSFET Current
          4. 8.2.1.2.4 Output Capacitance
          5. 8.2.1.2.5 Output Diode Rating
          6. 8.2.1.2.6 Power Stage Analysis
          7. 8.2.1.2.7 Loop Compensation
      2. 8.2.2 Isolated Flyback Regulator
        1. 8.2.2.1 Design Requirements
      3. 8.2.3 Boost Regulator
        1. 8.2.3.1 Design Requirements
      4. 8.2.4 24-V SEPIC Regulator
        1. 8.2.4.1 Design Requirements
      5. 8.2.5 12-V Automotive SEPIC Regulator
        1. 8.2.5.1 Design Requirements
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 接收文档更新通知
    2. 11.2 支持资源
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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5 Pin Configuration and Functions

Figure 5-1 D Package8-Pin SOICTop View
Figure 5-2 NGT Package8-Pin WSONTop View
Table 5-1 Pin Functions
PIN TYPE(1) DESCRIPTION
NAME SOIC WSON
COMP 7 1 O Open-drain output of the internal error amplifier: the loop compensation network must be connected between the COMP pin and the FB pin. COMP pullup is provided by an internal 5-kΩ resistor which can be used to bias an opto-coupler transistor (while FB is grounded) for isolated ground applications.
EN 8 2 I Enable and undervoltage lockout or shutdown input: an external voltage divider can be used to set the line undervoltage lockout threshold. If the EN pin is left unconnected, a 6-µA pullup current source pulls the EN pin high to enable the regulator.
EP — EP — Exposed pad (WSON only): exposed metal pad on the underside of the package with a resistive connection to pin 6. It is recommended to connect this pad to the PCB ground plane to improve heat dissipation.
FB 6 8 I Feedback input from the regulated output voltage: this pin is connected to the inverting input of the internal error amplifier. The 1.26-V reference is internally connected to the non-inverting input of the error amplifier.
GND 4 6 G Ground: internal reference for the regulator control functions and the power MOSFET current sense resistor connection.
RT 5 7 I Oscillator frequency programming and optional synchronization pulse input: the internal oscillator is set with a resistor, between this pin and the GND pin. The recommended frequency range is 50 KHz to 1.5 MHz. The RT pin can accept synchronization pulses from an external clock. A 100-pF capacitor is recommended for coupling the synchronizing clock to the RT pin.
SW 1 3 I Switch pin: the drain terminal of the internal power MOSFET
VIN 2 4 P Input supply pin: nominal operating range is 3.1 V to 75 V.
VCC 3 5 P Bias regulator output, or input for external bias supply: VCC tracks VIN up to 6.9 V. Above
VIN = 6.9 V, VCC is regulated to 6.9 V. A 0.47-µF or greater ceramic decoupling capacitor is required. An external voltage (7 V to 12 V) can be applied to this pin which disables the internal VCC regulator to reduce internal power dissipation and improve converter efficiency.
(1) G = Ground, I = Input, O = Output, P = Power