ZHCSOQ1D october 2022 – september 2023 TPS61033 , TPS610333
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Device Comparison Table
- 5 Revision History
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Undervoltage Lockout
- 8.3.2 Enable and Soft Start
- 8.3.3 Setting the Output Voltage
- 8.3.4 Current Limit Operation
- 8.3.5 Pass-Through Operation
- 8.3.6 Power Good Indicator
- 8.3.7 Implement Output Discharge by PG function
- 8.3.8 Overvoltage Protection
- 8.3.9 Output Short-to-Ground Protection
- 8.3.10 Thermal Shutdown
- 8.4 Device Functional Modes
- 9 Application and Implementation
- 10Device and Documentation Support
- 11Mechanical, Packaging, and Orderable Information
8.3.7 Implement Output Discharge by PG function
The purpose of the output discharge function is to ensure a defined down-ramp of the output voltage and to let the output voltage close to 0 V quickly when the device is being disabled. TPS61033 can implement output discharge function by PG function that requires a RDummy resistor connected between PG pin and Vout pin. PG is an open drain NMOS architecture with up to 50 mA current capability, the PG pin becomes logic high when the output voltage reaches the target value, so the dummy load resistor doesn't lead any power loss during normal operation. When the EN pin gets low, the TPS61033 is disabled and meanwhile the PG pin gets low with a typical 33μs glitch time (tglitch). With PG pin keeps low, the RDummy works as a dummy load to discharge output voltage. Changing RDummy can adjust the output discharge rate.
Figure 8-1 Implement Output
Discharge by PG function