ZHCSFR5 November   2016 TPS562210A , TPS563210A

PRODUCTION DATA.  

  1. 特性
  2. 应用
  3. 说明
  4. 修订历史记录
  5. Pin Configuration and Functions
  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 Timing Requirements
    7. 6.7 Typical Characteristics
      1. 6.7.1 TPS562210A Characteristics
      2. 6.7.2 TPS563210A Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 The Adaptive On-Time Control and PWM Operation
      2. 7.3.2 Soft Start and Pre-Biased Soft Start
      3. 7.3.3 Power Good
      4. 7.3.4 Current Protection
      5. 7.3.5 Over Voltage Protection
      6. 7.3.6 UVLO Protection
      7. 7.3.7 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Advanced Eco-Mode™ Control
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Typical Application, TPS562210A
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Output Voltage Resistors Selection
          2. 8.2.1.2.2 Output Filter Selection
          3. 8.2.1.2.3 Input Capacitor Selection
          4. 8.2.1.2.4 Bootstrap capacitor Selection
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Typical Application, TPS563210A
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedures
          1. 8.2.2.2.1 Output Filter Selection
        3. 8.2.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 器件支持
    2. 11.2 相关链接
    3. 11.3 接收文档更新通知
    4. 11.4 社区资源
    5. 11.5 商标
    6. 11.6 静电放电警告
    7. 11.7 Glossary
  12. 12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

Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

Application Information

The TPS562210A and TPS563210A are typically used as step down converters, which convert a voltage from 4.5 V to 17 V to a lower voltage. Webench software is available to aid in the design and analysis of circuits.

Typical Application

Typical Application, TPS562210A

4.5-V to 17-V Input, 1.05-V Output Converter.

TPS562210A TPS563210A Typ_app_2210a_slvsdp9.gif Figure 17. TPS562210A 1.05V/2A Reference Design

Design Requirements

For this design example, use the parameters shown in Table 1.

Table 1. Design Parameters

PARAMETER VALUES
Input voltage range 4.5 V to 17 V
Output voltage 1.05 V
Output current 2 A
Output voltage ripple 20 mVp-p

Detailed Design Procedure

Output Voltage Resistors Selection

The output voltage is set with a resistor divider from the output node to the VFB pin. It is recommended to use 1% tolerance or better divider resistors. Start by using Equation 3 to calculate VOUT.

To improve efficiency at light loads consider using larger value resistors, too high of resistance are more susceptible to noise and voltage errors from the VFB input current are more noticeable.

Equation 3. TPS562210A TPS563210A Eq02_VOUT_slvscm5.gif

Output Filter Selection

The LC filter used as the output filter has double pole at:

Equation 4. TPS562210A TPS563210A Eq03_FP_slvscm5.gif

At low frequencies, the overall loop gain is set by the output set-point resistor divider network and the internal gain of the device. The low frequency phase is 180 degrees. At the output filter pole frequency, the gain rolls off at a –40 dB per decade rate and the phase drops rapidly. D-CAP2™ introduces a high frequency zero that reduces the gain roll off to –20 dB per decade and increases the phase to 90 degrees one decade above the zero frequency. The inductor and capacitor for the output filter must be selected so that the double pole of Equation 4 is located below the high frequency zero but close enough that the phase boost provided be the high frequency zero provides adequate phase margin for a stable circuit. To meet this requirement use the values recommended in Table 2.

Table 2. TPS562210A Recommended Component Values

Output Voltage (V) R2 (kΩ) R3 (kΩ) L1 (µH) C6 + C7 + C8 (µF)
MIN TYP MAX
1 3.09 10.0 1.5 2.2 4.7 20 - 68
1.05 3.74 10.0 1.5 2.2 4.7 20 - 68
1.2 5.76 10.0 1.5 2.2 4.7 20 - 68
1.5 9.53 10.0 1.5 2.2 4.7 20 - 68
1.8 13.7 10.0 1.5 2.2 4.7 20 - 68
2.5 22.6 10.0 2.2 3.3 4.7 20 - 68
3.3 33.2 10.0 2.2 3.3 4.7 20 - 68
5 54.9 10.0 3.3 4.7 4.7 20 - 68
6.5 75 10.0 3.3 4.7 4.7 20 - 68

The inductor peak-to-peak ripple current, peak current and RMS current are calculated using Equation 5, Equation 6 and Equation 7. The inductor saturation current rating must be greater than the calculated peak current and the RMS or heating current rating must be greater than the calculated RMS current.

Use 650 kHz for fSW. Make sure the chosen inductor is rated for the peak current of Equation 6 and the RMS current of Equation 7.

Equation 5. TPS562210A TPS563210A Eq04_Ilpp_slvscm5.gif
Equation 6. TPS562210A TPS563210A Eq05_Ipeak_slvscm5.gif
Equation 7. TPS562210A TPS563210A Eq06_ILO_slvscm5.gif

For this design example, the calculated peak current is 2.34 A and the calculated RMS current is 2.01 A. The inductor used is a TDK CLF7045T-2R2N with a peak current rating of 5.5 A and an RMS current rating of 4.3 A.

The capacitor value and ESR determines the amount of output voltage ripple. The TPS562210A and TPS563210A are intended for use with ceramic or other low ESR capacitors. Recommended values range from 20µF to 68µF. Use Equation 8 to determine the required RMS current rating for the output capacitor.

Equation 8. TPS562210A TPS563210A Eq07_ICO_slvscm5.gif

For this design, two TDK C3216X5R0J226M 22 µF output capacitors are used. The typical ESR is 2 mΩ each. The calculated RMS current is 0.286A and each output capacitor is rated for 4A.

Input Capacitor Selection

The TPS562210A and TPS563210A require an input decoupling capacitor and a bulk capacitor is needed depending on the application. A ceramic capacitor over 10 µF is recommended for the decoupling capacitor. An additional 0.1 µF capacitor (C3) from pin 3 to ground is optional to provide additional high frequency filtering. The capacitor voltage rating needs to be greater than the maximum input voltage.

Bootstrap capacitor Selection

A 0.1µF ceramic capacitor must be connected between the VBST to SW pin for proper operation. It is recommended to use a ceramic capacitor.

Application Curves

The following application curves were generated using the application circuit of Figure 17.

TPS562210A TPS563210A D006_SLVSCM6.gif Figure 18. TPS562210A Efficiency
TPS562210A TPS563210A D008_SLVSCM6.gif Figure 20. TPS562210A Load Regulation, VI = 5 V
TPS562210A TPS563210A D010_SLVSCM6.gif Figure 22. TPS562210A Line Regulation
TPS562210A TPS563210A D007_SLVSCM6.gif Figure 19. TPS562210A Light Load Efficiency
TPS562210A TPS563210A D009_SLVSCM6.gif Figure 21. TPS562210A Load Regulation, VI = 12 V
TPS562210A TPS563210A Vin_ripple_2210_slvsCM6.gif Figure 23. TPS562210A Input Voltage Ripple
TPS562210A TPS563210A Vout_ripple_c_2210_slvsCM6.gif Figure 24. TPS562210A Output Voltage Ripple
TPS562210A TPS563210A Vout_ripple_a_2210_slvsCM6.gif Figure 26. TPS562210A Output Voltage Ripple
TPS562210A TPS563210A fig29_slvsdp9.gif Figure 28. TPS562210A Start Up Relative To VI
TPS562210A TPS563210A fig31_slvsdp9.gif Figure 30. TPS562210A Shut Down Relative To VI
TPS562210A TPS563210A Vout_ripple_b_2210_slvsCM6.gif Figure 25. TPS562210A Output Voltage Ripple
TPS562210A TPS563210A transient1_2210_slvsCM6.gif Figure 27. TPS562210A Transient Response
TPS562210A TPS563210A fig30_slvsdp9.gif Figure 29. TPS562210A Start Up Relative To En
TPS562210A TPS563210A fig32_slvsdp9.gif Figure 31. TPS562210A Shut Down Relative To EN

Typical Application, TPS563210A

4.5-V To 17-V Input, 1.05-V Output Converter.

TPS562210A TPS563210A Typ_app_3210a_slvsdp9.gif Figure 32. TPS563210A 1.05 V / 3A Reference Design

Design Requirements

For this design example, use the parameters shown in Table 3.

Table 3. Design Parameters

PARAMETER VALUE
Input voltage range 4.5 V to 17 V
Output voltage 1.05 V
Output current 3 A
Output voltage ripple 20 mVpp

Detailed Design Procedures

The detailed design procedure for TPS563210A is the same as for TPS562210A except for inductor selection.

Output Filter Selection

Table 4. TPS563210A Recommended Component Values

Output Voltage (V) R2 (kΩ) R3 (kΩ) L1 (µH) C6 + C7 + C8 (µF)
MIN TYP MAX
1 3.09 10.0 1.0 1.5 4.7 20 - 68
1.05 3.74 10.0 1.0 1.5 4.7 20 - 68
1.2 5.76 10.0 1.0 1.5 4.7 20 - 68
1.5 9.53 10.0 1.0 1.5 4.7 20 - 68
1.8 13.7 10.0 1.5 2.2 4.7 20 - 68
2.5 22.6 10.0 1.5 2.2 4.7 20 - 68
3.3 33.2 10.0 1.5 2.2 4.7 20 - 68
5 54.9 10.0 2.2 3.3 4.7 20 - 68
6.5 75 10.0 2.2 3.3 4.7 20 - 68

The inductor peak-to-peak ripple current, peak current and RMS current are calculated using Equation 9, Equation 10 and Equation 11. The inductor saturation current rating must be greater than the calculated peak current and the RMS or heating current rating must be greater than the calculated RMS current. Use 650 kHz for ƒSW.

Use 650 kHz for ƒSW. Make sure the chosen inductor is rated for the peak current of Equation 10 and the RMS current of Equation 11.

Equation 9. TPS562210A TPS563210A eq4_IIpp_slvscb0.gif
Equation 10. TPS562210A TPS563210A eq5_IIpeak_slvscb0.gif
Equation 11. TPS562210A TPS563210A eq6_ILO_slvscb0.gif

For this design example, the calculated peak current is 3.505 A and the calculated RMS current is 3.014 A. The inductor used is a TDK CLF7045T-1R5N with a peak current rating of 7.3-A and an RMS current rating of 4.9-A.

The capacitor value and ESR determines the amount of output voltage ripple. The TPS563209 is intended for use with ceramic or other low ESR capacitors. Recommended values range from 20 μF to 68 μF. Use Equation 7 to determine the required RMS current rating for the output capacitor. For this design three TDK C3216X5R0J226M 22 μF output capacitors are used. The typical ESR is 2 mΩ each. The calculated RMS current is 0.292A and each output capacitor is rated for 4 A.

Application Curves

The following application curves were generated using the application circuit of Figure 32.

TPS562210A TPS563210A D001_SLVSCM6.gif Figure 33. TPS563210A Efficiency
TPS562210A TPS563210A D003_SLVSCM6.gif Figure 35. TPS563210A Load Regulation, VI = 5 V
TPS562210A TPS563210A D002_SLVSCM6.gif Figure 34. TPS563210A Light Load Efficiency
TPS562210A TPS563210A D004_SLVSCM6.gif Figure 36. TPS563210A Load Regulation, VI = 12 V
TPS562210A TPS563210A D005_SLVSCM6.gif Figure 37. TPS563210A Line Regulation
TPS562210A TPS563210A Vout_ripple_c_3210_slvsCM6.gif Figure 39. TPS563210A Output Voltage Ripple
TPS562210A TPS563210A Vout_ripple_a_3210_slvsCM6.gif Figure 41. TPS563210A Output Voltage Ripple
TPS562210A TPS563210A fig44_slvsdp9.gif Figure 43. TPS563210A Start Up Relative To VI
TPS562210A TPS563210A fig46_slvsdp9.gif Figure 45. TPS563210A Shut Down Relative To VI
TPS562210A TPS563210A Vin_ripple_3210_slvsCM6.gif Figure 38. TPS563210A Input Voltage Ripple
TPS562210A TPS563210A Vout_ripple_b_3210_slvsCM6.gif Figure 40. TPS563210A Output Voltage Ripple
TPS562210A TPS563210A transient1_3210_slvsCM6.gif Figure 42. TPS563210A Transient Response
TPS562210A TPS563210A fig45_slvsdp9.gif Figure 44. TPS563210A Start Up Relative To EN
TPS562210A TPS563210A fig47_slvsdp9.gif Figure 46. TPS563210A Shut Down Relative To EN