SLVUCG5 January   2023 TPS7H1111-SP

PRODUCTION DATA  

  1.   TPS7H1111EVM-CVAL
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Related Information
    2. 1.2 Features
    3. 1.3 Applications
  4. 2Setup
    1. 2.1 Input/Output Connectors and Jumper Descriptions
      1. 2.1.1 Jumpers
      2. 2.1.2 Test Points
    2. 2.2 Equipment Setup
  5. 3Operation
  6. 4Adjustable Operation
  7. 5Test Results
    1. 5.1 Enable and Soft Start Timing
    2. 5.2 PSRR
    3. 5.3 Stability
    4. 5.4 Noise Spectral Density
  8. 6Board Layout
  9. 7Schematic
  10. 8Bill of Materials

5.3 Stability

Figure 5-3 shows the typical Bode gain and phase plot versus frequency for minimum no load, and maximum load of 1.5 A. Stability tests performed with the TPS7H1111EVM-CVAL operating with the following conditions: VIN = 2.5 V, VBIAS = 5 V, VOUT = 1.8 V.

Figure 5-3 TPS7H1111EVM-CVAL Gain and Phase vs. Frequency (Bode Plot)

Measuring accurate Bode response with a high bandwidth high gain LDO required using a very small injected signal. The signal injected used a shape for injected level with an injected signal reference level of -7 dBm. This reference level was reduced to -27 dBm from 10 kHz to 200 kHz. Additionally, the entire injected signal was externally attenuated with an inline attenuator by 26 dB. This was required to prevent overdriving the signal into feedback loop and keeping response within small signal behavior.