ZHCSN39A February 2020 – November 2021 LM61480 , LM61495 , LM62460
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Device Comparison Table
- 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 Output Voltage Selection
- 8.3.2 Enable EN Pin and Use as VIN UVLO
- 8.3.3 SYNC/MODE Uses for Synchronization
- 8.3.4 Clock Locking
- 8.3.5 Adjustable Switching Frequency
- 8.3.6 RESET Output Operation
- 8.3.7 Internal LDO, VCC UVLO, and BIAS Input
- 8.3.8 Bootstrap Voltage and VCBOOT-UVLO (CBOOT Pin)
- 8.3.9 Adjustable SW Node Slew Rate
- 8.3.10 Spread Spectrum
- 8.3.11 Soft Start and Recovery From Dropout
- 8.3.12 Overcurrent and Short Circuit Protection
- 8.3.13 Hiccup
- 8.3.14 Thermal Shutdown
- 8.4 Device Functional Modes
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Application
- 9.2.1 Design Requirements
- 9.2.2
Detailed Design Procedure
- 9.2.2.1 Choosing the Switching Frequency
- 9.2.2.2 Setting the Output Voltage
- 9.2.2.3 Inductor Selection
- 9.2.2.4 Output Capacitor Selection
- 9.2.2.5 Input Capacitor Selection
- 9.2.2.6 BOOT Capacitor
- 9.2.2.7 BOOT Resistor
- 9.2.2.8 VCC
- 9.2.2.9 CFF and RFF Selection
- 9.2.2.10 RSPSP Selection
- 9.2.2.11 RT Selection
- 9.2.2.12 RMODE Selection
- 9.2.2.13 External UVLO
- 9.2.2.14 Maximum Ambient Temperature
- 9.2.3 Application Curves
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
9.2.3 Application Curves
Unless otherwise specified, the following conditions apply: Device: LM61495-Q1,
VIN = 13.5 V, TA = 25°C. The circuit is shown in Figure 9-1, with the appropriate
BOM from Table 9-4.
Unless otherwise specified, the following conditions apply: Device: LM61495-Q1,
VIN = 13.5 V, TA = 25°C. The circuit is shown in Figure 9-1, with the appropriate
BOM from Table 9-4.
Figure 9-5 Efficiency. Unless otherwise specified, the following conditions apply: Device: LM61495-Q1,
VIN = 13.5 V, TA = 25°C. The circuit is shown in Figure 9-1, with the appropriate
BOM from Table 9-4.
| VOUT = 5 V | FSW = 400 kHz | Auto mode |
| VOUT = 3.3 V | FSW = 400 kHz | Auto mode |
| VOUT = 5 V | FSW = 2.2 MHz | Auto mode |
| VOUT = 3.3 V | FSW = 2.2 MHz | Auto mode |
| VOUT = 5 V | FSW = 400 kHz | Auto mode |
| VOUT = 3.3 V | FSW = 400 kHz | Auto mode |
| VOUT = 5 V | FSW = 2.2 MHz | Auto mode |
| VOUT = 3.3 V | FSW = 2.2 MHz | Auto mode |
| VOUT = 5 V | FSW = 400 kHz | Auto mode |
| VOUT = 5 V | FSW = 2.2 MHz | Auto mode |
| VOUT = 5 V | FSW = 400 kHz | Auto mode |
| VOUT = 5 V | FSW = 2.2 MHz | Auto mode |
| VOUT = 5 V | FSW = 2100 kHz | Auto mode |
| IOUT = 50 mA | VIN = 13.5 V |
| VOUT = 5 V | FSW = 2100 kHz | Auto mode |
| IOUT = 50 mA | VIN = 13.5 V |
| VOUT = 3.3 V | FSW = 2100 kHz | FPWM mode |
| IOUT = 3.25 A | VIN = 13.5 V |
| VOUT = 5 V | FSW = 2100 kHz | FPWM mode |
| IOUT = Short Circuit to 5 A | VIN = 13.5 V | |
| VOUT = 5 V | FSW = 400 kHz | Auto mode |
| IOUT = 10 mA to 10 A to 10 mA | VIN = 13.5 V | TR = TF = 1 μs |
| VOUT = 5 V | FSW = 400 kHz | Auto mode |
| IOUT = 2 A to 4 A to 2 A | VIN = 13.5 V | TR = TF = 1 μs |
| VOUT = 3.3 V | FSW = 400 kHz | Auto mode |
| IOUT = 10 mA to 10 A to 10 mA | VIN = 13.5 V | TR = TF = 1 μs |
| VOUT = 5 V | FSW = 2200 kHz | FPWM mode |
| IOUT = 10 mA to 10 A to 10 mA | VIN = 13.5 V | TR = TF = 1 μs |
| VOUT = 5 V | FSW = 2200 kHz | Auto mode |
| IOUT = 5 A to 10 A to 5 A | VIN = 13.5 V | TR = TF = 1 μs |
| VOUT = 5 V | FSW = 400 kHz | IOUT = 10 A |
| Frequency Tested: 30 MHz to 1 GHz | ||
| VOUT = 5 V | FSW = 400 kHz | FPWM mode |
| VOUT = 3.3 V | FSW = 400 kHz | FPWM mode |
| VOUT = 5 V | FSW = 2.2 MHz | FPWM mode |
| VOUT = 3.3 V | FSW = 2.2 MHz | FPWM mode |
| VOUT = 5 V | FSW = 400 kHz | FPWM mode |
| VOUT = 3.3 V | FSW = 400 kHz | FPWM mode |
| VOUT = 5 V | FSW = 2.2 MHz | FPWM mode |
| VOUT = 3.3 V | FSW = 2.2 MHz | FPWM mode |
| VOUT = 3.3 V | FSW = 400 kHz | Auto mode |
| VOUT = 3.3 V | FSW = 2.2 MHz | Auto mode |
| VOUT = 3.3 V | FSW = 400 kHz | Auto mode |
| VOUT = 3.3 V | FSW = 2.2 MHz | Auto mode |
| VOUT = 5 V | FSW = 2100 kHz | FPWM mode |
| IOUT = 50 mA | VIN = 13.5 V |
| VOUT = 5 V | FSW = 2100 kHz | FPWM mode |
| IOUT = 50 mA | VIN = 13.5 V |
| VOUT = 5 V | FSW = 2100 kHz | FPWM mode |
| IOUT = 5 A to Short Circuit | VIN = 13.5 V |
| VOUT = 5 V | FSW = 2100 kHz | FPWM mode |
| IOUT = 4 A | VIN = 13.5 V to 4 V to 13.5 V | |
| VOUT = 5 V | FSW = 400 kHz | FPWM mode |
| IOUT = 10 mA to 10 A to 10 mA | VIN = 13.5 V | TR = TF = 1 μs |
| VOUT = 5 V | FSW = 400 kHz | Auto mode |
| IOUT = 5 A to 10 A to 5 A | VIN = 13.5 V | TR = TF = 1 μs |
| VOUT = 3.3 V | FSW = 400 kHz | Auto mode |
| IOUT = 5 A to 10 A to 5 A | VIN = 13.5 V | TR = TF = 1 μs |
| VOUT = 5 V | FSW = 2200 kHz | Auto mode |
| IOUT = 2 A to 4 A to 2 A | VIN = 13.5 V | TR = TF = 1 μs |
| VOUT = 5 V | FSW = 400 kHz | IOUT = 10 A |
| Frequency Tested: 30 MHz to 1 GHz | ||
Table 9-4 BOM for Typical Application
Curves
| VOUT | FREQUENCY | RFBB | COUT | CIN + CHF | L | CFF |
|---|---|---|---|---|---|---|
| 3.3 V | 400 kHz | 43.2 k? | 4 x 47 μF + 100 μF electrolytic + 2 x 2.2 μF | 4 × 10 μF + 2 × 470 nF + 100 μF electrolytic | 2.4 μH (744325240) | 22 pF |
| 3.3 V | 2200 kHz | 43.2 k? | 2 x 47 μF + 100 μF electrolytic + 2 x 2.2 μF | 2 × 10 μF + 2 × 470 nF + 100 μF electrolytic | 0.68 μH (744373460068) | 10 pF |
| 5 V | 400 kHz | 24.9 k? | 4 x 47 μF + 100 μF electrolytic + 2 x 2.2 μF | 4 × 10 μF + 2 × 470 nF + 100 μF electrolytic | 2.4 μH (744325240) | 22 pF |
| 5 V | 2200 kHz | 24.9 k? | 2 x 47 μF + 100 μF electrolytic + 2 x 2.2 μF | 2 × 10 μF + 2 × 470 nF + 100 μF electrolytic | 0.68 μH (744373460068) | 10 pF |