ZHCSHX8D September 2017 – October 2019 TPS50601A-SP
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 VIN and Power VIN Pins (VIN and PVIN)
- 7.3.2 Voltage Reference
- 7.3.3 Adjusting the Output Voltage
- 7.3.4 Safe Start-Up Into Prebiased Outputs
- 7.3.5 Error Amplifier
- 7.3.6 Slope Compensation
- 7.3.7 Enable and Adjust UVLO
- 7.3.8 Adjustable Switching Frequency and Synchronization (SYNC)
- 7.3.9 Slow Start (SS/TR)
- 7.3.10 Power Good (PWRGD)
- 7.3.11 Sequencing (SS/TR)
- 7.3.12 Output Overvoltage Protection (OVP)
- 7.3.13 Overcurrent Protection
- 7.3.14 Thermal Shutdown
- 7.3.15 Turn-On Behavior
- 7.3.16 Small Signal Model for Frequency Compensation
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機械、封裝和可訂購信息
7.3.16 Small Signal Model for Frequency Compensation
The device uses a transconductance amplifier for the error amplifier and readily supports two of the commonly used frequency compensation circuits shown in Figure 22. In Type 2A, one additional high-frequency pole is added to attenuate high-frequency noise.
The following design guidelines are provided for advanced users who prefer to compensate using the general method. The step-by-step design procedure described in Detailed Design Procedure may also be used.
Figure 22. Types of Frequency Compensation The general design guidelines for device loop compensation are as follows:
- Determine the crossover frequency fco. A good starting point is one-tenth of the switching frequency, ƒSW.
- R3 can be determined by:
- Place a compensation zero at the dominant pole
using C1 and R3.
C1 can be determined by - C2 is optional. It can be used to cancel the zero from the equivalent series resistance (ESR) of the output capacitor COUT.
where gmea is the gm of the error amplifier (1400 μS), gmps is the gm of the power stage (22 S) and VREF is the reference voltage (0.804 V).
