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  • SN6501 用于隔离电源的变压器驱动器

    • ZHCS785I February   2012  – January 2021 SN6501

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  • CONTENTS
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  • SN6501 用于隔离电源的变压器驱动器
  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Revision History
  4. 4 Pin Configuration and Functions
  5. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Handling Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Switching Characteristics
    7. 5.7 Typical Characteristics
  6. 6 Parameter Measurement Information
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Push-Pull Converter
      2. 7.3.2 Core Magnetization
    4. 7.4 Device Functional Modes
      1. 7.4.1 Start-Up Mode
      2. 7.4.2 Operating Mode
      3. 7.4.3 Off-Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 SN6501 Drive Capability
        2. 8.2.2.2 LDO Selection
        3. 8.2.2.3 Diode Selection
        4. 8.2.2.4 Capacitor Selection
        5. 8.2.2.5 Transformer Selection
          1. 8.2.2.5.1 V-t Product Calculation
          2. 8.2.2.5.2 Turns Ratio Estimate
          3. 8.2.2.5.3 Recommended Transformers
      3. 8.2.3 Application Curve
      4. 8.2.4 Higher Output Voltage Designs
      5. 8.2.5 Application Circuits
  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 Device Support
      1. 11.1.1 第三方产品免责声明
    2. 11.2 Trademarks
    3. 11.3 静电放电警告
    4. 11.4 术语表
  12. 12Mechanical, Packaging, and Orderable Information
  13. 重要声明
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DATA SHEET

SN6501 用于隔离电源的变压器驱动器

本资源的原文使用英文撰写。 为方便起见，TI 提供了译文；由于翻译过程中可能使用了自动化工具，TI 不保证译文的准确性。 为确认准确性，请务必访问 ti.com 参考最新的英文版本（控制文档）。

1 特性

  • 用于小型变压器的推挽式驱动器
  • 3.3V 或 5V 单电源
  • 初级侧高电流驱动：
    • 5V 电源：350mA（最大值）
    • 3.3V 电源：150mA（最大值）
  • 低整流输出纹波可使用小型输出电容器
  • 小型 5 引脚 SOT-23 封装

2 应用

  • 用于 CAN、RS-485、RS-422、RS-232、SPI、I2C、低功耗 LAN 的隔离式接口电源
  • 工业自动化
  • 过程控制
  • 医疗设备

3 说明

SN6501 是一款单片振荡器/电源驱动器，专门针对隔离接口应用中的小外形尺寸、隔离电源而设计。该器件通过 3.3V 或者 5V 直流 (DC) 电源驱动低高度中间抽头式变压器初级。根据变压器匝数比绕制次级侧以提供任意隔离式电压。

SN6501 由振荡器和栅极驱动电路组成，此电路提供互补输出信号，用于驱动以地为基准的 N 沟道开关管。内部逻辑确保了两个开关之间的先开后合操作。

SN6501 采用小型小外形尺寸晶体管 (SOT)-23 (5) 封装，并且其额定运行温度介于 –40°C 到 125°C 之间。

器件信息
器件型号(1)封装封装尺寸（标称值）
SN6501SOT-23 (5)2.90mm x 1.60mm
(1) 如需了解所有可用封装，请参阅数据表末尾的可订购产品附录。
GUID-5FBD9689-A05F-4DF0-BDDA-E6F494D0D37C-low.gif简化版原理图.
GUID-EC1F511A-AD85-487A-9CE1-7993E5AB9895-low.gif输出电压和效率与输出电流间的关系.

Revision History

Changes from Revision H (July 2019) to Revision I (January 2021)

  • Added a short-circuit protection note to Section 8.2.2.1 Go
  • Removed duplicate equation labeled as (5) in Revision H Go

Changes from Revision G (July 2014) to Revision H (July 2019)

  • Added HCT-SM-1.3-8-2 transformer to Recommended Isolation Transformers Optimized for SN6501Table 8-3 tableGo
  • Added EPC3668G-LF transformer to Recommended Isolation Transformers Optimized for SN6501Table 8-3 tableGo
  • Added DA2303-AL transformer to Recommended Isolation Transformers Optimized for SN6501Table 8-3 tableGo
  • Added DA2304-AL transformer to Recommended Isolation Transformers Optimized for SN6501Table 8-3 tableGo

Changes from Revision F (August 2013) to Revision G (July 2014)

  • 添加了引脚配置和功能 部分、处理等级 表、特性说明 部分、器件功能模式、应用和实施 部分、电源相关建议 部分、布局 部分、器件和文档支持 部分以及机械、封装和可订购信息 部分Go

Changes from Revision E (January 2013) to Revision F (August 2013)

  • Added Figure 5-13 and Figure 5-14 Go
  • Added Figure 5-17 through Figure 5-18 Go
  • Added Figure 5-23 through Figure 5-24 Go
  • Changed Table 8-3 - Recommended Isolation Transformers Optimized for SN6501Go

Changes from Revision D (September 2012) to Revision E (January 2013)

  • Changed Figure 5-23 Go

Changes from Revision C (March 2012) to Revision D (September 2012)

  • Changed fOSC, Oscillator frequency To: fSW, D1, D2 Switching frequency Go
  • Added graphs Figure 5-3 through Figure 5-4 Go
  • Changed the title of Figure 5-30 From: D1, D2 Oscillator Frequency vs Free-Air Temperature To: D1, D2 Switching Frequency vs Free-Air TemperatureGo
  • Added section: Recommended TransformersGo
  • Changed the location and title of Figure 8-7 Go

Changes from Revision B (March 2012) to Revision C (March 2012)

  • Changed the fOSC Oscillator frequency values Go
  • Changed Equation 4 Go

Changes from Revision A (March 2012) to Revision B (March 2012)

  • 将“特性”从小型 5 引脚 DBV 封装更改为：小型 5 引脚 SOT23 封装Go
  • Changed Figure 8-7 titleGo

Changes from Revision * (February 2012) to Revision A (March 2012)

  • 将器件状态从“产品预发布”更改为“量产”Go
  • Changed Equation 9 Go
  • Changed Equation 10 Go
  • Changed Table 8-4, From: Wuerth-Elektronik / Midcom To: Wurth Electronics Midcom IncGo
  • Changed Figure 8-16 Go

4 Pin Configuration and Functions

GUID-647A5D4D-BD23-4AFC-83F9-37916A906D0C-low.gif Figure 4-1 5-Pin SOT-23DBV PackageTop View
Table 4-1 Pin Functions
PIN DESCRIPTION
NAME NUMBER TYPE
D1 1 OD Open Drain output 1. Connect this pin to one end of the transformer primary side.
VCC 2 P Supply voltage input. Connect this pin to the center-tap of the transformer primary side. Buffer this voltage with a 1 μF to 10 μF ceramic capacitor.
D2 3 OD Open Drain output 2. Connect this pin to the other end of the transformer primary side.
GND 4,5 P Device ground. Connect this pin to board ground.

5 Specifications

5.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MINMAXUNIT
VCCSupply voltage–0.36V
VD1, VD2Output switch voltage14V
ID1P, ID2PPeak output switch current500mA
PTOTContinuous power dissipation250mW
TJJunction temperature170°C
(1) Stresses beyond those listed under Absolute Maximum Ratings cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under GUID-A0DE0DCD-8B81-4452-96FD-0DDCF656724D.html#GUID-A0DE0DCD-8B81-4452-96FD-0DDCF656724D is not implied. Exposure to absolute-maximum-rated conditions for extended periods affects device reliability.

5.2 Handling Ratings

MINMAXUNIT
TstgStorage temperature range–65150°C
V(ESD)Electrostatic dischargeHuman body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1)–44kV
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2)–1.51.5
Machine Model JEDEC JESD22-A115-A–200200V
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

5.3 Recommended Operating Conditions

MINTYPMAXUNIT
VCCSupply voltage35.5V
VD1, VD2Output switch voltageVCC = 5 V ± 10%,When connected to Transformer with primary winding Center-tapped011V
VCC = 3.3 V ± 10%07.2
ID1, ID2D1 and D2 output switch current – Primary-sideVCC = 5 V ± 10%VD1, VD2 Swing ≥ 3.8 V,
see GUID-86052CDA-17DA-4B91-88F5-0F5CE40B7854.html#SLLSEA06773 for typical characteristics		350mA
VCC = 3.3 V ± 10%VD1, VD2 Swing ≥ 2.5 V,
see GUID-86052CDA-17DA-4B91-88F5-0F5CE40B7854.html#SLLSEA05741 for typical characteristics		150
TAAmbient temperature–40125°C

5.4 Thermal Information

THERMAL METRIC SN6501 UNIT
DBV 5-PINS
θJA Junction-to-ambient thermal resistance 208.3 °C/W
θJCtop Junction-to-case (top) thermal resistance 87.1
θJB Junction-to-board thermal resistance 40.4
ψJT Junction-to-top characterization parameter 5.2
ψJB Junction-to-board characterization parameter 39.7
θJCbot Junction-to-case (bottom) thermal resistance N/A

 
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