- 您现在的位置：买卖IC网 > PDF目录1227 > MAX16929EVKIT+ (Maxim Integrated Products)KIT EVALUATION FOR MAX16929 PDF资料下载
参数资料
| 型号： | MAX16929EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/25页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MAX16929 |
| 标准包装： | 1 |
| 主要目的： | 汽车，显示器电源 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | * |
| 主要属性： | 汽车，薄膜晶体管（TFT），液晶显示器（LCD）应用 |
| 已供物品： | 板 |
MAX16929
Automotive TFT-LCD Power Supply with Boost
Converter and Gate Voltage Regulators
where:
f POLE_IN =
1
2 π × C IN × (R BE /R IN )
Table 4. Minimum Output Capacitance vs.
Output Voltage Range for Negative-Gate
Voltage Regulator (I OUT = 10mA to 15mA)
C IN =
, R IN =
f POLE_IN =
f POLE =
f POLE_FBGL =
f ZERO_ESR =
g m h FE
2 π f T g m
g m is the transconductance of the pass transistor, and
f T is the transition frequency. Both parameters can be
found in the transistor’s data sheet. Because R BE is
much greater than R IN , the above equation can be
simplified:
1
2 π × C IN × R IN
Substituting for C IN and R IN yields:
f T
h FE
4) Next, calculate the pole set by the regulator’s feed-
back resistance and the capacitance between FBGL
and GND (including stray capacitance):
1
2 π × C FBGL × (R TOP /R BOTTOM )
where C FBGL is the capacitance between FBGL and
GND and is equal to 30pF, R TOP is the upper resistor
of the regulator’s feedback divider, and R BOTTOM is
the lower resistor of the divider.
5) Next, calculate the zero caused by the output capaci-
tor’s ESR:
1
2 π × C OUT_LR × R ESR
where R ESR is the equivalent series resistance of
C OUT_LR . To ensure stability, make C OUT_LR large
enough so the crossover occurs well before the poles
and zero calculated in steps 2 to 5. The poles in steps
3 and 4 generally occur at several MHz and using
ceramic capacitors ensures the ESR zero also occurs
at several MHz. Placing the crossover frequency below
500kHz is sufficient to avoid the amplifier delay pole
OUTPUT VOLTAGE MINIMUM OUTPUT
RANGE CAPACITANCE (μF)
-2V R V GL R -4V 2.2
-5V R V GL R -7V 1.5
-8V R V GL R -13V 1
Applications Information
Power Dissipation
An IC’s maximum power dissipation depends on the ther-
mal resistance from the die to the ambient environment
and the ambient temperature. The thermal resistance
depends on the IC package, PCB copper area, other
thermal mass, and airflow. More PCB copper, cooler
ambient air, and more airflow increase the possible dis-
sipation, while less copper or warmer air decreases the
IC’s dissipation capability. The major components of
power dissipation are the power dissipated in the buck
converter, boost converter, positive-gate voltage regula-
tor, negative-gate voltage regulator, and the 1.8V/3.3V
regulator controller.
Buck Converter
In the buck converter, conduction and switching losses
in the internal MOSFET are dominant. Estimate these
losses using the following formula:
P LXB ≈ [(I OUTB × √ D ) 2 × R DS_ON(LXB) ] + [0.5 × V INB ×
I OUTB × (t R + t F ) × f SWB ]
where I OUTB is the output current, D is the duty cycle
of the buck converter, R DS_ON(LXB) is the on-resistance
of the internal high-side FET, V INB is the input voltage,
(t R + t F) is the time is takes for the switch current and
voltage to settle to their final values during the rising and
falling transitions, and f SWB is the switching frequency
of the buck converter. R DS_ON(LXB) is 180m I (typ) and
(t R + t F) is 4.4ns + 4.6ns = 9ns at V INB = 12V.
and generally works well, unless unusual component
choices or extra capacitances move one of the other
poles or the zero below 1MHz.
Table 4 is a list of recommended minimum output capaci-
tance for the negative-gate voltage regulator and are
applicable for output currents in the 10mA to 15mA range.
???????????????????????????????????????????????????????????????? Maxim Integrated Products 21
相关PDF资料 |
PDF描述 |
|---|---|
| MAX16946EVKIT+ | KIT EVALUATION FOR MAX16946 |
| MAX17015EVKIT+ | KIT EVAL FOR MAX17015 |
| MAX17021EVKIT+ | EVAL KIT FOR MAX17021 |
| MAX1702EVKIT | EVAL KIT FOR MAX1702 |
| MAX17710EVKIT# | RD ENERGY HARVESTING |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16929EVKIT# | 功能描述:电源管理IC开发工具 MAX16929 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX16929EVKIT+ | 功能描述:电源管理IC开发工具 MAX16929 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| 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 |
发布紧急采购，3分钟左右您将得到回复。