ZHCSBB6H April 2012 – November 2017 LM34927
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 Control Overview
- 7.3.2 VCC Regulator
- 7.3.3 Regulation Comparator
- 7.3.4 Overvoltage Comparator
- 7.3.5 On-Time Generator
- 7.3.6 Current Limit
- 7.3.7 N-Channel Buck Switch and Driver
- 7.3.8 Synchronous Rectifier
- 7.3.9 Undervoltage Detector
- 7.3.10 Thermal Protection
- 7.3.11 Ripple Configuration
- 7.3.12 Soft Start
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1
Application Circuit: 20-V to 95-V Input and 10-V, 300-mA Output Isolated Fly-Buck Converter
- 8.2.1.1 Design Requirements
- 8.2.1.2
Detailed Design Procedure
- 8.2.1.2.1 Transformer Turns Ratio
- 8.2.1.2.2 Total IOUT
- 8.2.1.2.3 RFB1, RFB2
- 8.2.1.2.4 Frequency Selection
- 8.2.1.2.5 Transformer Selection
- 8.2.1.2.6 Primary Output Capacitor
- 8.2.1.2.7 Secondary Output Capacitor
- 8.2.1.2.8 Type III Feedback Ripple Circuit
- 8.2.1.2.9 Secondary Diode
- 8.2.1.2.10 VCC and Bootstrap Capacitor
- 8.2.1.2.11 Input Capacitor
- 8.2.1.2.12 UVLO Resistors
- 8.2.1.2.13 VCC Diode
- 8.2.1.3 Application Curves
- 8.2.1
Application Circuit: 20-V to 95-V Input and 10-V, 300-mA Output Isolated Fly-Buck Converter
- 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)
- DDA|8
訂購信息
6.7 Typical Characteristics
Figure 1. Efficiency at 750 kHz, VOUT1 = 10 V
Figure 3. VCC vs ICC
Figure 2. VCC vs VIN
Figure 4. ICC vs External VCC
Figure 7. IIN vs VIN (Operating, Non-switching)
Figure 9. Efficiency
Figure 11. Buck Transient Response 36 VIN
Figure 13. Buck Transient Response 48 VIN
Figure 6. TOFF (ILIM) vs VFB and VIN
Figure 8. IIN vs VIN (Shutdown)
Figure 10. Buck Transient Response 36 VIN
Figure 12. Buck Transient Response 48 VIN
Figure 14. Buck Transient Response 72 VIN