ZHCS779B
March 2012 – December 2023
UCC28070A
PRODUCTION DATA
1
1
特性
2
应用
3
说明
4
Pin Configuration and Functions
4.1
Pin Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Thermal Information
5.5
Electrical Characteristics
5.6
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Interleaving
6.3.2
Programming the PWM Frequency and Maximum Duty-Cycle Clamp
6.3.3
Frequency Dithering (Magnitude and Rate)
6.3.4
External Clock Synchronization
6.3.5
Multi-phase Operation
6.3.6
VSENSE and VINAC Resistor Configuration
6.3.7
VSENSE and VINAC Open-Circuit Protection
6.3.8
Current Synthesizer
6.3.9
Programmable Peak Current Limit
6.3.10
Linear Multiplier and Quantized Voltage Feed Forward
6.3.11
Enhanced Transient Response (VA Slew-Rate Correction)
6.3.12
Voltage Biasing (VCC and VVREF)
6.3.13
PFC Enable and Disable
6.3.14
Adaptive Soft Start
6.3.15
PFC Start-Up Hold Off
6.3.16
Output Overvoltage Protection (OVP)
6.3.17
Zero-Power Detection
6.3.18
Thermal Shutdown
6.3.19
Current Loop Compensation
6.3.20
Voltage Loop Compensation
6.4
Device Functional Modes
7
Application and Implementation
7.1
Application Information
7.2
Typical Application
7.2.1
Design Requirements
7.2.2
Detailed Design Procedure
7.2.2.1
Output Current Calculation
7.2.2.2
Bridge Rectifier
7.2.2.3
PFC Inductor (L1 and L2)
7.2.2.4
PFC MOSFETs (M1 and M2)
7.2.2.5
PFC Diode
7.2.2.6
PFC Output Capacitor
7.2.2.7
Current-Loop Feedback Configuration (Sizing of the Current-Transformer Turns-Ratio and Sense Resistor (RS))
7.2.2.8
Current-Sense Offset and PWM Ramp for Improved Noise Immunity
7.2.3
Application Curves
7.3
Power Supply Recommendations
7.4
Layout
7.4.1
Layout Guidelines
7.4.2
Layout Example
8
Device and Documentation Support
8.1
Documentation Support
8.1.1
Related Documentation
8.2
Community Resources
8.3
Trademarks
9
Revision History
10
Mechanical, Packaging, and Orderable Information
封装选项
机械数据 (封装 | 引脚)
PW|20
MPDS362A
散热焊盘机械数据 (封装 | 引脚)
订购信息
zhcs779b_oa
zhcs779b_pm
5.6
Typical Characteristics
Figure 5-1
VCC Supply Current vs Junction Temperature
Figure 5-3
V
VSENSE
Regulation vs Junction Temperature
Figure 5-5
IMO, Multiplier Output Current vs V
VAO
Figure 5-7
I
VINAC
Bias Current vs Junction Temperature
Figure 5-9
VAO, Voltage Amplifier Transconductance vs Junction Temperature
Figure 5-11
Current Amplifier Transconductance vs Junction Temperature
I
VREF
= 0mA
Figure 5-2
V
VREF
vs Junction Temperature
Figure 5-4
I
VSENSE
Bias Current vs Junction Temperature
Figure 5-6
Multiplier Constant vs Junction Temperature
Figure 5-8
Switching Frequency vs Temperature
Figure 5-10
Voltage Amplifier Transfer Function vs V
VSENSE
0.8V Common Mode
Figure 5-12
CAx Input Offset Voltage vs Junction Temperature
2V Common Mode
Figure 5-14
CAx Input Offset Voltage vs Junction Temperature
3.6V Common Mode
Figure 5-16
CAx Input Offset Voltage vs Junction Temperature
0.8V Common Mode
Figure 5-13
CA1 to CA2 Relative Offset vs Junction Temperature
2V Common Mode
Figure 5-15
CA1 to CA2 Relative Offset vs Junction Temperature
3.6V Common Mode
Figure 5-17
CA1 to CA2 Relative Offset vs Junction Temperature
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