ZHCS547K January 2010 – February 2018 LM27402
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 Wide Input Voltage Range
- 7.3.2 UVLO
- 7.3.3 Precision Enable
- 7.3.4 Soft-Start and Voltage Tracking
- 7.3.5 Output Voltage Setpoint and Accuracy
- 7.3.6 Voltage-Mode Control
- 7.3.7 Power Good
- 7.3.8 Inductor-DCR-Based Overcurrent Protection
- 7.3.9 Current Sensing
- 7.3.10 Power MOSFET Gate Drivers
- 7.3.11 Pre-Bias Start-up
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1
Application Information
- 8.1.1 Converter Design
- 8.1.2 Inductor Selection (L)
- 8.1.3 Output Capacitor Selection (COUT)
- 8.1.4 Input Capacitor Selection (CIN)
- 8.1.5 Using Precision Enable
- 8.1.6 Setting the Soft-Start Time
- 8.1.7 Tracking
- 8.1.8 Setting the Switching Frequency
- 8.1.9 Setting the Current Limit Threshold
- 8.1.10 Control Loop Compensation
- 8.1.11 MOSFET Gate Drivers
- 8.1.12 Power Loss and Efficiency Calculations
- 8.2 Typical Applications
- 8.1
Application Information
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機械、封裝和可訂購信息
封裝選項
機械數據 (封裝 | 引腳)
散熱焊盤機械數據 (封裝 | 引腳)
訂購信息
8.2.3 Example Circuit 3
Figure 47. 3.3-V Input voltage, 0.9-V Output Voltage, 20-A Output Current, 500-kHz Switching Frequency
Table 3. Bill Of Materials
| DESIGNATOR | TYPE | PARAMETERS | PART NUMBER | QTY | MANUFACTURER |
|---|---|---|---|---|---|
| U1 | IC | Synchronous Buck Voltage-Mode PWM Controller | LM27402 | 1 | TI |
| CBOOT | Capacitor | 0.22 µF, Ceramic, X7R, 25 V, 10% | GRM188R71E224KA88D | 1 | Murata |
| CC1 | Capacitor | 820 pF, Ceramic, COG, 50 V, 5% | GRM1885C1H821JA01D | 1 | Murata |
| CC2 | Capacitor | 68 pF, Ceramic, COG, 50 V, 5% | GRM1885C1H680JA01D | 1 | Murata |
| CC3 | Capacitor | 390 pF, Ceramic, COG, 50 V, 5% | GRM1885C1H391JA01D | 1 | Murata |
| CVDD | Capacitor | 1 µF, Ceramic, X5R, 25 V, 10% | GRM188R61E105KA12D | 1 | Murata |
| CF | Capacitor | 1 µF, Ceramic, X5R, 25 V, 10% | GRM188R61E105KA12D | 1 | Murata |
| CIN | Capacitor | 22 µF, Ceramic, X5R, 25 V, 10% | C2012X5R0J226M | 5 | TDK |
| COUT | Capacitor | 100 µF, Ceramic, X5R, 6.3 V, 20% | JMK316BJ107ML | 3 | Taiyo Yuden |
| CS | Capacitor | 0.22 µF, Ceramic, X7R, 25 V, 10% | GRM188R71E224KA88D | 1 | Murata |
| CSS | Capacitor | 22000 pF, Ceramic, X7R, 16 V, 10% | GRM188R71E223KA01D | 1 | Murata |
| CSBY | Capacitor | 68 pF, Ceramic, C0G, 50 V, 5% | GRM1885C1H680JA01D | 1 | Murata |
| DBOOT | Diode | Schottky Diode, Average I = 100 mA, Max Surge I = 750 mA | CMOSH-3 | 1 | Central Semi |
| DSW | Diode | Schottky Diode, Average I = 3A, Max Surge I = 80 A | CMSH3-40M | 1 | Central Semi |
| LOUT | Inductor | 0.33 µH, 1.4 mΩ | RL-8250-1.4-R33M | 1 | Renco |
| QL | N-Ch MOSFET | 20 V, 100 A, 64 nC, RDS(on) at 4.5 V = 1.6 mΩ | BSC019N02KS | 1 | Infineon |
| QH | N-Ch MOSFET | 20 V, 100 A, 40 nC, RDS(on) at 4.5 V = 2.1 mΩ | BSC026N02KS | 1 | Infineon |
| RC1 | Resistor | 10.0 kΩ, 1%, 0.1 W | CRCW060310K0FKEA | 1 | Vishay |
| RC2 | Resistor | 150Ω, 1%, 0.1 W | CRCW0603150RFKEA | 1 | Vishay |
| RDD | Resistor | 1Ω, 5%, 0.1 W | CRCW06031R00JNEA | 1 | Vishay |
| RFADJ | Resistor | 20.0 kΩ, 1%, 0.1 W | CRCW060320K0FKEA | 1 | Vishay |
| RFB1 | Resistor | 20.0 kΩ, 1%, 0.1 W | CRCW060320K0FKEA | 1 | Vishay |
| RFB2 | Resistor | 40.2 kΩ, 1%, 0.1 W | CRCW060340K2FKEA | 1 | Vishay |
| RF | Resistor | 2.2 Ω, 5%, 0.1 W | CRCW06032R20JNEA | 1 | Vishay |
| RPGD | Resistor | 51.1 kΩ, 5%, 0.1 W | CRCW060351K1JNEA | 1 | Vishay |
| RS | Resistor | 1.07 kΩ, 1%, 0.1 W | CRCW06031K07FKEA | 1 | Vishay |
| RSET | Resistor | 5.11 kΩ, 1%, 0. W | CRCW06035K11FKEA | 1 | Vishay |