ZHCSR75 November   2022 TPSM82902

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 Mode Selection and Device Configuration (MODE/S-CONF)
      2. 7.3.2 Adjustable VO Operation (External Voltage Divider)
      3. 7.3.3 Setable VO Operation (VSET and Internal Voltage Divider)
      4. 7.3.4 Soft Start/Tracking (SS/TR)
      5. 7.3.5 Smart Enable with Precise Threshold
      6. 7.3.6 Power Good (PG)
      7. 7.3.7 Undervoltage Lockout (UVLO)
      8. 7.3.8 Current Limit And Short Circuit Protection
      9. 7.3.9 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Pulse Width Modulation (PWM) Operation
      2. 7.4.2 AEE (Automatic Efficiency Enhancement)
      3. 7.4.3 Power Save Mode Operation (Auto PFM/PWM)
      4. 7.4.4 100% Duty-Cycle Operation
      5. 7.4.5 Output Discharge Function
      6. 7.4.6 Starting into a Pre-Biased Load
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application with Adjustable Output Voltage
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Programming the Output Voltage
        3. 8.2.2.3 Capacitor Selection
          1. 8.2.2.3.1 Output Capacitor
          2. 8.2.2.3.2 Input Capacitor
          3. 8.2.2.3.3 Soft-Start Capacitor
        4. 8.2.2.4 Tracking Function
      3. 8.2.3 Application Curves
    3. 8.3 Typical Application with Setable VO Using VSET
      1. 8.3.1 Design Requirements
      2. 8.3.2 Detailed Design Procedure
      3. 8.3.3 Application Curves
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
        1. 8.5.2.1 Thermal Considerations
  9. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 第三方产品免责声明
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    2. 9.2 接收文档更新通知
    3. 9.3 支持资源
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 术语表
  10. 10Mechanical, Packaging, and Orderable Information

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7.3.1 Mode Selection and Device Configuration (MODE/S-CONF)

With MODE/S-CONF (SmartConfig application), this device features an input with two functions. It can be used to customize the device behavior in two ways:

  • Select the device mode (FPWM or auto PFM/PWM with AEE operation) traditionally with a HIGH- or LOW-level.
  • Select the device configuration (switching frequency, internal/external feedback, output discharge, and PFM/PWM mode) by connecting a single resistor to the MODE/S-CONF pin.

The device interprets this pin during the start-up sequence after the internal OTP readout and before it starts switching in soft start. If the device reads a HIGH- or LOW-level, the dynamic mode change is active and PFM/PWM mode can be changed during operation. If the device reads a resistor value, there is no further interpretation during operation and device mode or other configurations cannot be changed afterward.

Note: The MODE/S-CONF pin must not be left floating. Connect the pin high, low, or to a resistor to configure the device according to Table 7-2.

Figure 7-1 Interpretation of S-CONF and VSET Flow
CAUTION: For each operating mode and switching frequency, the following VOUT range is recommended:
Table 7-1 Recommended VOUT Ranges with Respect to MODE and FSW
ModeFSW (MHz)VOUT
Auto PFM/PWM1 MHz0.4 V < VOUT < 2.0 V
Forced PWM1 MHz0.4 V < VOUT < 2.0 V
Auto PFM/PWM with AEE2.5 MHz0.4 V < VOUT< 5.5 V
Forced PWM2.5 MHz2.0 V < VOUT < 5.5 V
Failure to follow the recommended VOUT ranges causes the device to malfunction.
Table 7-2 SmartConfig™ Application Setting Table
#Level Or Resistor Value [Ω] (1)FB/VSET-PinFSW (MHz)Output DischargeMode (Auto or Forced PWM)Dynamic Mode Change
Setting Options by Level
1GNDexternal FB2.5yesAuto PFM/PWM with AEE active
2HIGH (>VIH_MODE)external FB2.5yesForced PWM
Setting Options by Resistor
37.15 kexternal FB2.5noAuto PFM/PWM with AEEnot active
48.87 kexternal FB2.5noForced PWM
511.0 kexternal FB1yesAuto PFM/PWM
613.7 kexternal FB1yesForced PWM
716.9 kexternal FB1noAuto PFM/PWM
821.0 kexternal FB1noForced PWM
926.1 kVSET2.5yesAuto PFM/PWM with AEE
1032.4 kVSET2.5yesForced PWM
1140.2 kVSET2.5noAuto PFM/PWM with AEE
1249.9 kVSET2.5noForced PWM
1361.9 kVSET1yesAuto PFM/PWM
1476.8 kVSET1yesForced PWM
1595.3 kVSET1noAuto PFM/PWM
16118 kVSET1noForced PWM
(1) E96 Resistor Series, 1% Accuracy, Temperature Coefficient better or equal than ±200 ppm/°C