ZHCSCB9D April   2014  – December 2019 TPS22965-Q1

PRODUCTION DATA.  

  1. 特性
  2. 应用
  3. 说明
    1.     Device Images
      1.      简化电路原理图
      2.      RON 与 VIN 之间的关系(VBIAS = 5V,IOUT = –200mA)
  4. 修订历史记录
  5. Device Comparison Table
  6. Pin Configuration and Functions
    1.     Pin Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics—VBIAS = 5 V
    6. 7.6 Electrical Characteristics—VBIAS = 2.5 V
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
      1. 7.8.1 Typical DC Characteristics
      2. 7.8.2 Typical Switching Characteristics
  8. Parameter Measurement Information
  9. Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Adjustable Rise Time
      2. 9.3.2 Quick Output Discharge (TPS22965-Q1 and TPS22965W-Q1 Only)
      3. 9.3.3 Low Power Consumption During Off State
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 VIN to VOUT Voltage Drop
      2. 10.1.2 On and Off Control
      3. 10.1.3 Input Capacitor (Optional)
      4. 10.1.4 Output Capacitor (Optional)
      5. 10.1.5 VIN and VBIAS Voltage Range
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Inrush Current
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
    3. 12.3 Thermal Consideration
  13. 13器件和文档支持
    1. 13.1 文档支持
      1. 13.1.1 相关文档
    2. 13.2 接收文档更新通知
    3. 13.3 社区资源
    4. 13.4 商标
    5. 13.5 静电放电警告
    6. 13.6 Glossary
  14. 14机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

Adjustable Rise Time

A capacitor to GND on the CT pin sets the slew rate. The voltage on the CT pin can be as high as 12 V. Therefore, the minimum voltage rating for the CT cap must be 25 V for optimal performance. An approximate formula for the relationship between CT and slew rate when VBIAS is set to 5 V is shown in Equation 1. This equation accounts for 10% to 90% measurement on VOUT and does NOT apply for CT = 0 pF. Use Table 1 to determine rise times for when CT = 0 pF.

Equation 1. TPS22965-Q1 eq1_lvsbj0.gif

where

  • SR = slew rate (in µs/V)
  • CT = the capacitance value on the CT pin (in pF)
  • The units for the constant 34 are µs/V. The units for the constant 0.38 are µs/(V × pF).

Rise time can be calculated by multiplying the input voltage by the slew rate. Table 1 contains rise time values measured on a typical device. The rise times listed in Table 1 are only valid for the power-up sequence where VIN and VBIAS are already in steady state condition before the ON pin is asserted high.

Table 1. Rise Time vs CT Capacitor

CT (pF) RISE TIME (µs) 10% - 90%, CL = 0.1 µF, CIN = 1 µF, RL = 10 Ω, VBIAS = 5 V (1)
VIN = 5 V VIN = 3.3 V VIN = 1.8 V VIN = 1.5 V VIN = 1.2 V VIN = 1.05 V VIN = 0.8 V
0 180 136 94 84 74 70 60
220 547 378 232 202 173 157 129
470 962 654 386 333 282 252 206
1000 1983 1330 765 647 533 476 382
2200 4013 2693 1537 1310 1077 959 766
4700 8207 5490 3137 2693 2200 1970 1590
10000 17700 11767 6697 5683 4657 4151 3350
Typical Values at 25°C with a 25-V X7R 10% Ceramic Capacitor on CT