ZHCSPF2B December 2021 – December 2024 LM5168 , LM5169
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 Device Comparison Table
- 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 Control Architecture
- 7.3.2 Internal VCC Regulator and Bootstrap Capacitor
- 7.3.3 Internal Soft Start
- 7.3.4 On-Time Generator
- 7.3.5 Current Limit
- 7.3.6 N-Channel Buck Switch and Driver
- 7.3.7 Synchronous Rectifier
- 7.3.8 Enable, Undervoltage Lockout (EN/UVLO)
- 7.3.9 Power Good (PGOOD)
- 7.3.10 Thermal Protection
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Fly-Buck? Converter Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 Switching Frequency (RT)
- 8.2.2.2 Transformer Selection
- 8.2.2.3 Output Capacitor Selection
- 8.2.2.4 Secondary Output Diode
- 8.2.2.5 Setting Output Voltage
- 8.2.2.6 Input Capacitor
- 8.2.2.7 Type-3 Ripple Network
- 8.2.2.8 CBST Selection
- 8.2.2.9 Minimum Secondary Output Load
- 8.2.2.10 Example Design Summary
- 8.2.3 Application Curves
- 8.3 Typical Buck Application
- 8.4 Power Supply Recommendations
- 8.5 Layout
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
封裝選項
機械數(shù)據(jù) (封裝 | 引腳)
散熱焊盤機械數(shù)據(jù) (封裝 | 引腳)
- DDA|8
訂購信息
8.3.3 Application Curves
The curves in this section were taken using the LM5169PDDAR. Unless otherwise specified the following conditions apply: TA = 25°C.
| VOUT = 5 V | FSW = 500 kHz |
| VOUT = 24 V | FSW = 500 kHz |
| VOUT = 12 V | FSW = 500 kHz |
| VIN = 48 V | IOUT = 0 A to 0.6 A |
| TR = TF = 1 μs |
| VIN = 48 V | IOUT = 0 A to 0.5 A |
| TR = TF = 1 μs |
| VIN = 36 V | IOUT = 0 A to 0.6 A |
| TR = TF = 1 μs |
| VIN = 48 V | VOUT = 5 V |
| IOUT = 600 mA | FSW = 500 kHz |
| VIN = 48 V | VOUT = 5 V |
| IOUT = 600 mA |
| IOUT = 600 mA | VOUT = 5 V |
| VOUT = 12 V | FSW = 500 kHz |
| VOUT = 5 V | FSW = 500 kHz |
| VOUT = 24 V | FSW = 500 kHz |
| VIN = 48 V | IOUT = 0.1 A to 0.6 A |
| TR = TF = 1 μs |
| VIN = 48 V | IOUT = 0.1 A to 0.5 A |
| TR = TF = 1 μs |
| VIN = 36 V | IOUT = 0.1 A to 0.6 A |
| TR = TF = 1 μs |
| VIN = 48 V | VOUT = 5 V |
| IOUT = 10 mA |
| IOUT = 0 A | LM5169P |
| IOUT = 300 mA |
Table 8-4 BOM for Application Curves
| VOUT | RA | RFBB | RFBT | CA | CB | COUT | L |
|---|---|---|---|---|---|---|---|
| 5 V | 121 kΩ | 143 kΩ | 453 kΩ | 3300 pF | 56 pF | 2x 22 μF | 68 μH, 0.17 Ω |
| 12 V | 182 kΩ | 49.9 kΩ | 453 kΩ | 3300 pF | 56 pF | 2x 22 μF | 68 μH, 0.17 Ω |
| 24 V | 243 kΩ | 23.7 kΩ | 453 kΩ | 3300 pF | 56 pF | 2x 22 μF | 68 μH, 0.17 Ω |