</a>LED" title="LED">LED" title="LED">LED TV的LED背光照明.本文介紹了HT7A4016主要特性,方框圖以及針對各種不同應用電路的參考設計電路.
The HT7A4016 is a controller IC that includes the necessary features to implement off-line or DC-DC current mode control schemes with a minimal external parts count. Internal circuits include a specially designed Mixed-Mode/Analog Interface for multi-function and multi-topology control schemes (DC-DC Buck/Boost, Off-line AC-DC), a trimmed oscillator for precise duty-cycle control under voltage lockout with a start-up current of less than 0.5mA, a wide temperature range, precise voltage reference, internal Slope Compensation and Leading-Edge Blanking. The HT7A4016 features basic system protection functions such as Cycle-by-Cycle Current Limiting and Under Voltage Lock-Out (UVLO). A Multi-Function Pin can be used as a dimming function for LED driving, and as a primary feedback control f o r Primary - Side Feed back AC - DC applications.
HT7A4016主要特性:
• High Performance, Low Cost Current Mode PWM Controller especially designed for Energy Star 2.0
• Very Low Startup Current (<20μA) and Operating Current
• High-Voltage CMOS Process with Excellent ESD protection (>3KV)
• ±5% Trimmed Oscillator for Precise Frequency Control
• LEB (Leading-Edge Blanking) on CS Pin
• Internal Slope Compensation
• Programmable Switching Frequency
• Internally Trimmed Reference with UVLO (Under Voltage Lockout)
• Cycle-by-Cycle Current Limiting
HT7A4016應用:
• Switching AC-DC Adaptors
• DC-DC Switching Buck/Boost Converters
• LED Backlights for LCD/LED TVs
圖1. HT7A4016方框圖
圖2. HT7A4016典型應用電路圖
圖3. HT7A4016恒壓升壓應用電路圖(DC/DC升壓)
圖4. HT7A4016用于背光LED驅動的DC/DC恒流升壓應用電路圖
圖5. HT7A4016 LED照明驅動的恒流降壓應用電路圖
圖6. HT7A4016恒流降壓穩壓器應用電路圖(高邊降壓)
圖7. HT7A4016初級反饋的隔離反激AC/DC轉換器電路圖
詳情請見:
http://www.holtek.com.tw/PDF/Power_Management/ht7a4016v100.pdf
The HT7A4016 is a controller IC that includes the necessary features to implement off-line or DC-DC current mode control schemes with a minimal external parts count. Internal circuits include a specially designed Mixed-Mode/Analog Interface for multi-function and multi-topology control schemes (DC-DC Buck/Boost, Off-line AC-DC), a trimmed oscillator for precise duty-cycle control under voltage lockout with a start-up current of less than 0.5mA, a wide temperature range, precise voltage reference, internal Slope Compensation and Leading-Edge Blanking. The HT7A4016 features basic system protection functions such as Cycle-by-Cycle Current Limiting and Under Voltage Lock-Out (UVLO). A Multi-Function Pin can be used as a dimming function for LED driving, and as a primary feedback control f o r Primary - Side Feed back AC - DC applications.
HT7A4016主要特性:
• High Performance, Low Cost Current Mode PWM Controller especially designed for Energy Star 2.0
• Very Low Startup Current (<20μA) and Operating Current
• High-Voltage CMOS Process with Excellent ESD protection (>3KV)
• ±5% Trimmed Oscillator for Precise Frequency Control
• LEB (Leading-Edge Blanking) on CS Pin
• Internal Slope Compensation
• Programmable Switching Frequency
• Internally Trimmed Reference with UVLO (Under Voltage Lockout)
• Cycle-by-Cycle Current Limiting
HT7A4016應用:
• Switching AC-DC Adaptors
• DC-DC Switching Buck/Boost Converters
• LED Backlights for LCD/LED TVs
圖1. HT7A4016方框圖
圖2. HT7A4016典型應用電路圖
圖3. HT7A4016恒壓升壓應用電路圖(DC/DC升壓)
圖4. HT7A4016用于背光LED驅動的DC/DC恒流升壓應用電路圖
圖5. HT7A4016 LED照明驅動的恒流降壓應用電路圖
圖6. HT7A4016恒流降壓穩壓器應用電路圖(高邊降壓)
圖7. HT7A4016初級反饋的隔離反激AC/DC轉換器電路圖
詳情請見:
http://www.holtek.com.tw/PDF/Power_Management/ht7a4016v100.pdf
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