ADI 公司的ADP1612/ADP1613是直流升压电源转换器,集成了功率开关,能提供高达20V的输出电压,封装高度不到1.1mm,非常适合空间受限的应用如手提设备或TFT-LCD显示器. ADP1612/ADP1613工作在电流模式PWM,效率高达94%, ADP1612可提供1.4A电流, ADP1613可提供2A电流.ADP1612的输入电压可低至1.8V, ADP1613的输入电压可低至2.5V.本文介绍了ADP1612/ADP1613的主要特性,方框图以及多种应用电路,采用ADP1612/ADP1613的SEPIC 转换器和TFT LCD 偏压电源电路.
The ADP1612/ADP1613 are step-up dc-to-dc switching converters with an integrated power switch capable of providing an output voltage as high as 20 V. With a package height of less than 1.1 mm, the ADP1612/ADP1613 are optimal for space-constrained applications such as portable devices or thin film transistor (TFT) liquid crystal displays (LCDs).
The ADP1612/ADP1613 operate in current mode pulse-width modulation (PWM) with up to 94% efficiency. Adjustable soft start prevents inrush currents when the part is enabled. The pin-selectable switching frequency and PWM current-mode architecture allow for excellent transient response, easy noise filtering, and the use of small, cost-saving external inductors and capacitors. Other key features include undervoltage lockout (UVLO), thermal shutdown (TSD), and logic controlled enable.
The ADP1612/ADP1613 are available in the lead-free 8-lead MSOP.
ADP1612/13主要特性:
Current limit
1.4 A for the ADP1612
2.0 A for the ADP 1613
Minimum input voltage
1.8 V for the ADP1612
2.5 V for the ADP1613
Pin-selectable 650 kHz or 1.3 MHz PWM frequency
Adjustable output voltage up to 20 V
Adjustable soft start
Undervoltage lockout
Thermal shutdown
8-lead MSOP
ADP1612/13应用:
TFT LCD bias supplies
Portable applications
Industrial/instrumentation equipment
图1.ADP1612/13升压稳压器应用方框图
图2.ADP1612/13升压稳压器
图3.带关断的ADP1612/13升压稳压器
图4.ADP1612 升压稳压器配置( VOUT = 5 V, fSW = 650 kHz )
图5.ADP1612 升压稳压器配置( VOUT = 5 V, fSW = 1.3 MHz )
图6.ADP1612 升压稳压器配置( VOUT = 12 V, fSW = 650 kHz )
图7.ADP1612 升压稳压器配置(VOUT = 12 V, fSW = 1.3 MHz )
图8.ADP1612 升压稳压器配置( VOUT = 15 V, fSW = 650 kHz )
图9.ADP1612 升压稳压器配置(VOUT =15 V, fSW = 1.3 MHz )
图10.ADP1613 升压稳压器配置(VOUT = 12 V, fSW = 650 kHz )
图11.ADP1613 升压稳压器配置(VOUT = 12 V, fSW = 1.3 MHz )
图12.ADP1613 升压稳压器配置( VOUT = 15 V, fSW = 650 kHz )
图13.ADP1613 升压稳压器配置( VOUT = 15 V, fSW = 1.3 MHz )
图14.ADP1613 升压稳压器配置( VOUT = 20 V, fSW = 650 kHz )
图15.SEPIC 转换器
图16.TFT LCD 偏压电源
