ZHCSHL8D December 2017 – August 2020 LMZM33602
PRODUCTION DATA
- 1特性
- 2应用
- 3说明
- 4Revision History
- 5Pin Configuration and Functions
- 6Specifications
-
7Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Adjusting the Output Voltage
- 7.3.2 Feedforward Capacitor, CFF
- 7.3.3 Voltage Dropout
- 7.3.4 Switching Frequency (RT)
- 7.3.5 Synchronization (SYNC)
- 7.3.6 Input Capacitors
- 7.3.7 Output Capacitors
- 7.3.8 Output On/Off Enable (EN)
- 7.3.9 Programmable Undervoltage Lockout (UVLO)
- 7.3.10 Power Good (PGOOD)
- 7.3.11 Overcurrent Protection (OCP)
- 7.3.12 Thermal Shutdown
- 7.4 Device Functional Modes
- 8Application and Implementation
- 9Device and Documentation Support
7.3.2 Feedforward Capacitor, CFF
The LMZM33602 is internally compensated to be stable over the operating frequency and output voltage range. However, depending on the output voltage, an additional feedforward capacitor can be required. TI recommends an external feedforward capacitor, CFF, be placed in parallel with the top resistor divider, RFBT for optimum transient performance. The value for CFF can be calculated using Equation 2.
where
- COUT is the value after derating in µF
- RFBT is in kΩ
Refer to Table 7-1 for the recommended CFF value for several output voltages.