SNVS118F december 1999 – may 2023 LM2594 , LM2594HV
PRODUCTION DATA
- 1
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Description (continued)
- 6 Pin Configuration and Functions
-
7 Specifications
- 7.1 Absolute Maximum Ratings
- 7.2 ESD Ratings
- 7.3 Recommended Operating Conditions
- 7.4 Thermal Information
- 7.5 Electrical Characteristics – 3.3 V
- 7.6 Electrical Characteristics – 5 V
- 7.7 Electrical Characteristics – 12 V
- 7.8 Electrical Characteristics – Adjustable
- 7.9 Electrical Characteristics – All Output Voltage Versions
- 7.10 Typical Characteristics
- 8 Detailed Description
- 9 Application and Implementation
- 10Device and Documentation Support
- 11Mechanical, Packaging, and Orderable Information
9.2.2.2.4 Feedforward Capacitor (CFF)
For output voltages greater than approximately 10 V, an additional capacitor is required. The compensation capacitor is typically between 50 pF and 10 nF, and is wired in parallel with the output voltage setting resistor, R2. It provides additional stability for high output voltages, low input or output voltages, and very low ESR output capacitors, such as solid tantalum capacitors calculated with Equation 7.
This capacitor type can be ceramic, plastic, silver mica, and so forth (because of the unstable characteristics of ceramic capacitors made with Z5U material, they are not recommended).
Table 9-7 contains feedforward capacitor values for various output voltages. In this example, a 1-nF capacitor is needed.