ZHCSJ68A December 2018 – September 2021 LM34936-Q1
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 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 Fixed Frequency Valley/Peak Current Mode Control with Slope Compensation
- 7.3.2 VCC Regulator and Optional BIAS Input
- 7.3.3 Enable/UVLO
- 7.3.4 Soft Start
- 7.3.5 Overcurrent Protection
- 7.3.6 Average Input/Output Current Limiting
- 7.3.7 Operation Above 28-V Input
- 7.3.8 CCM Operation
- 7.3.9 Frequency and Synchronization (RT/SYNC)
- 7.3.10 Frequency Dithering
- 7.3.11 Output Overvoltage Protection (OVP)
- 7.3.12 Power Good (PGOOD)
- 7.3.13 Gm Error Amplifier
- 7.3.14 Integrated Gate Drivers
- 7.3.15 Thermal Shutdown
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 Custom Design with WEBENCH Tools
- 8.2.2.2 Frequency
- 8.2.2.3 VOUT
- 8.2.2.4 Inductor Selection
- 8.2.2.5 Output Capacitor
- 8.2.2.6 Input Capacitor
- 8.2.2.7 Sense Resistor (RSENSE)
- 8.2.2.8 Slope Compensation
- 8.2.2.9 UVLO
- 8.2.2.10 Soft-Start Capacitor
- 8.2.2.11 Dither Capacitor
- 8.2.2.12 MOSFETs QH1 and QL1
- 8.2.2.13 MOSFETs QH2 and QL2
- 8.2.2.14 Frequency Compensation
- 8.2.3 Application Curves
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
6.6 Typical Characteristics
At TA = 25°C, unless otherwise stated.
| VOUT = 12 V | FSW = 300 kHz | L1 = 4.7 μH |
| IOUT = 5 A |
Figure 6-3 Oscillator Frequency
Figure 6-5 IIN Operating vs VIN
Figure 6-7 ENABLE/UVLO Rising Threshold vs Temperature
Figure 6-9 Boost Current Limit vs Temperature
| VOUT = 12 V | VIN = 11 V |
| VOUT = 12 V | VIN = 13 V |
| VOUT = 6 V | VIN = 12 V | Load 3 A to 6 A |
| VOUT = 24 V | VIN = 12 V | Load 3 A to 6 A |
| VOUT = 12 V | VIN = 24 V | Hiccup Enabled |
| VOUT = 12 V | FSW = 300 kHz | L1 = 4.7 μH |
Figure 6-4 VCC vs VIN
Figure 6-6 IIN Shutdown vs VIN
Figure 6-8 Buck Current Limit vs Temperature
| VOUT=12 V | VIN=6 V |
| VOUT = 12 V | VIN = 12 V |
| VOUT = 12 V | VIN = 24 V |
| VOUT = 12 V | VIN = 12 V | Load 3 A to 6 A |
| VIN = 8 V to 24 V | IOUT = 3 A |
| VIN = 24 V | RSENSE = 10 mΩ |