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MAX16929
Automotive TFT-LCD Power Supply with Boost
Converter and Gate Voltage Regulators
η V IN
the device’s built-in digital soft-start functions reduce the
number of external components required while control-
ling inrush currents. The output voltage can be set from
V INA to 18V with an external resistive voltage-divider.
The regulator controls the output voltage by modulat-
ing the duty cycle (D) of the internal power MOSFET in
each switching cycle. The duty cycle of the MOSFET is
approximated by:
D =1 ?
V O
where V IN is the voltage at INA, V O = V SH (the boost
output voltage), and E is the efficiency of the boost con-
verter, as shown in the Typical Operating Characteristics .
Figure 1 shows the functional diagram of the boost
regulator. An error amplifier compares the signal at FBP
CLOCK
to 1V and changes the COMPV output. The voltage at
COMPV sets the peak inductor current. As the load var-
ies, the error amplifier sources or sinks current to the
COMPV output accordingly to produce the peak induc-
tor current necessary to service the load. To maintain
stability at high duty cycles, a slope-compensation sig-
nal (set by the capacitor at COMPI) is summed with the
current-sense signal. On the rising edge of the internal
clock, the controller turns on the n-channel MOSFET and
applies the input voltage across the inductor. The current
through the inductor ramps up linearly, storing energy in
its magnetic field. Once the sum of the current feedback
signal and the slope compensation exceeds the COMPV
voltage, the controller turns off the MOSFET. The inductor
current then flows through the diode to the output. The
MOSFET remains off for the rest of the clock cycle.
LXP
LOGIC AND
DRIVER
I LIM
COMPARATOR
PWM
SOFT-
START
V LIMIT
PGNDP
2.2MHz
OSCILLATOR
COMPARATOR
Σ
CURRENT
SENSE
SLOPE
COMP
ERROR
COMPI
TO FAULT LOGIC
AMP
FBP
MAX16929
FAULT
COMPARATOR
0.85V
1V
COMPV
Figure 1. Boost Converter Functional Diagram
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相关代理商/技术参数
MAX16929FGUI/V+
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929FGUI/V+T
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929GGUI/V+
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929GGUI/V+T
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929GUI/V+
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929GUI/V+T
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929HGUI/V+
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube
MAX16929HGUI/V+T
功能描述:LCD 驱动器 18V 2MHz Auto TFT-LCD Pwr Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube