ZHCSCD8C April 2014 – April 2019 LM46002
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 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, Peak-Current-Mode-Controlled, Step-Down Regulator
- 7.3.2 Light Load Operation
- 7.3.3 Adjustable Output Voltage
- 7.3.4 Enable (ENABLE)
- 7.3.5 VCC, UVLO, and BIAS
- 7.3.6 Soft Start and Voltage Tracking (SS/TRK)
- 7.3.7 Switching Frequency (RT) and Synchronization (SYNC)
- 7.3.8 Minimum ON-Time, Minimum OFF-Time, and Frequency Foldback at Dropout Conditions
- 7.3.9 Internal Compensation and CFF
- 7.3.10 Bootstrap Voltage (BOOT)
- 7.3.11 Power Good (PGOOD)
- 7.3.12 Overcurrent and Short-Circuit Protection
- 7.3.13 Thermal Shutdown
- 7.4 Device Functional Modes
-
8 Applications and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 Custom Design With WEBENCH® Tools
- 8.2.2.2 Output Voltage Setpoint
- 8.2.2.3 Switching Frequency
- 8.2.2.4 Input Capacitors
- 8.2.2.5 Inductor Selection
- 8.2.2.6 Output Capacitor Selection
- 8.2.2.7 Feed-Forward Capacitor
- 8.2.2.8 Bootstrap Capacitors
- 8.2.2.9 VCC Capacitor
- 8.2.2.10 BIAS Capacitors
- 8.2.2.11 Soft-Start Capacitors
- 8.2.2.12 Undervoltage Lockout Setpoint
- 8.2.2.13 PGOOD
- 8.2.3 Application Performance Curves
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機械、封裝和可訂購信息
8.2.3 Application Performance Curves
Please refer to Table 2 for bill of materials for each VOUT and FS combination. Unless otherwise stated, application performance curves were taken at TA = 25 °C.
| VOUT = 3.3 V | FS = 500 kHz | VIN = 24 V |
| VOUT = 3.3 V | FS = 500 kHz |
| VOUT = 5 V | FS = 500 kHz | VIN = 24 V |
| VOUT = 5 V | FS = 500 kHz |
| VOUT = 5 V | FS = 500 kHz | VIN = 24 V |
| VOUT = 5 V | FS = 200 kHz | VIN = 24 V |
| VOUT = 5 V | FS = 200 kHz |
| VOUT = 5 V | FS = 200 kHz | VIN = 24 V |
| VOUT = 5 V | FS = 1 MHz | VIN = 24 V |
| VOUT = 5 V | FS = 1 MHz |
| VOUT = 5 V | FS = 1 MHz | VIN = 24 V |
| VOUT = 12 V | FS = 500 kHz | VIN = 24 V |
| VOUT = 12 V | FS = 500 kHz |
| VOUT = 24 V | FS = 500 kHz | VIN = 48 V |
| VOUT = 24 V | FS = 500 kHz |
| VOUT = 24 V | FS = 500 kHz | VIN = 48 V |
| VOUT = 3.3 V | FS = 500 kHz | RθJA = 20°C/W |
i.
Figure 85. Derating Curve with RθJA = 20°C/W | VOUT = 5 V | FS = 200 kHz | RθJA = 20°C/W |
| VOUT = 3.3 V | FS = 500 kHz |
| VOUT = 3.3 V | FS = 500 kHz | IOUT = 2 A |
| VOUT = 3.3 V | FS = 500 kHz | IOUT = 5 mA |
| VIN = 24 V | VOUT = 3.3 V | RLOAD = 3.3 Ω |
| VIN = 24 V | VOUT = 3.3 V | RLOAD = Open |
| VOUT = 3.3 V | FS = 500 kHz | IOUT = 2 A |
| VOUT = 3.3 V | FS = 500 kHz | VIN = 24 V |
| VOUT = 3.3 V | FS = 500 kHz |
| VOUT = 3.3 V | FS = 500 kHz |
| VOUT = 3.3 V | FS = 500 kHz | VIN = 24 V |
| VOUT = 5 V | FS = 500 kHz |
| VOUT = 5 V | FS = 500 kHz |
| VOUT = 5 V | FS = 500 kHz | VIN = 24 V |
| VOUT = 5 V | FS = 200 kHz |
| VOUT = 5 V | FS = 200 kHz |
| VOUT = 5 V | FS = 200 kHz |
| VOUT = 5 V | FS = 1 MHz | VIN = 24 V |
| VOUT = 5 V | FS = 1 MHz |
| VOUT = 5 V | FS = 1 MHz | VIN = 24 V |
| VOUT = 12 V | FS = 500 kHz |
| VOUT = 12 V | FS = 500 kHz |
| VOUT = 24 V | FS = 500 kHz |
| VOUT = 24 V | FS = 500 kHz |
| VOUT = 5 V | FS = 500 kHz | RθJA = 20°C/W |
| VOUT = 5 V | FS = 1 MHz | RθJA = 20°C/W |
| VOUT = 5 V | FS = 1 MHz |
| VOUT = 3.3 V | FS = 500 kHz | IOUT = 130 mA |
| VIN = 24 V | VOUT = 3.3 V | RLOAD = 1.65 Ω |
| VIN = 24 V | VOUT = 3.3 V | RLOAD = 33 Ω |
| VIN = 24 V | VOUT = 12 V | RLOAD = 6 Ω |
| VOUT = 3.3 V | FS = 500 kHz | IOUT = 0.5 A |