- 您现在的位置：买卖IC网 > PDF目录16560 > MAX749ESA+T (Maxim Integrated Products)IC SUPPLY LCD BIAS ADJ 8-SOIC PDF资料下载
参数资料
| 型号： | MAX749ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPPLY LCD BIAS ADJ 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | LCD 显示器 |
| 电流 - 电源： | 60µA |
| 电源电压： | 2 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
Digitally Adjustable LCD Bias Supply
+2V TO +6V
INPUT
0.1 μ F
22 μ F
V+
Q
TRIG
CURRENT
140mV
R SENSE
MINIMUM
OFF-TIME
ONE-SHOT
COMPARATOR
S
FLIP-FLOP
Q
DHI
Q1
ZTX750
R
DLOW
MAXIMUM
ON-TIME
ONE-SHOT
TRIG
Q
VOLTAGE
COMPARATOR
R BASE
470 ?
L1
47 μ H
D1
1N5819
FB
R FB
V OUT
(NEGATIVE)
MAX749
REF
GND
6-BIT
CURRENT-OUTPUT
DAC
C COMP
22 μ F
30V
Figure 2. Switch-Mode Power-Supply Section Block Diagram
Once turned off, a one-shot holds the switch off for a
minimum of 1μs, and the switch either stays off (if the
output is in regulation), or turns on again (if the output
is out of regulation).
With light loads, the transistor switches for one or more
cycles and then turns off, much like a traditional PFM
converter. With heavy loads, the transistor stays on until
the switch current reaches the current limit; it then
shuts off for 1μs, and immediately turns on again until
the next time the switch current reaches its limit. This
cycle repeats until the output is in regulation.
Output Voltage Control
The output voltage is set using a single external resistor
and the internal current-output DAC (Figure 1). The full-
ments the DAC output. When incremented beyond full
scale, the counter rolls over and sets the DAC to the
minimum value. In this way, a single pulse applied to
ADJ increases the DAC set point by one step, and 63
pulses decrease the set point by one step.
Table 1 is the logic table for the CTRL and ADJ inputs,
which control the internal DAC and counter. Figures 3-7
show various timing specifications and different ways of
incrementing and resetting the DAC, and of placing it in
the low-power standby mode. As long as the timing
specifications for ADJ and CTRL are observed, any
sequence of operations can be implemented.
Table 1. Input Truth Table
scale output voltage is set by selecting the feedback
resistor, R FB . The output voltage is controlled from 33%
to 100% of the full-scale output by an internal 64-step
DAC/counter.
On power-up or after a reset, the counter sets the DAC
output to mid-range. Each rising edge of ADJ incre-
ADJ
Low
High
X
CTRL
Low
Low
High
High
RESULT
Shut down
Reset counter to mid-range. The
device is not shut down.
On
Increment the counter
6
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| RSA06DRSN-S288 | CONN EDGECARD 12POS .125 EXTEND |
| H3CCS-6406M | IDC CABLE - HKC64S/AE64M/HKC64S |
| UPC3218GV-EVAL | EVAL BOARD FOR UPC3218GV |
| M2MXH-2020K | IDC CABLE - MDM20H/MC20F/X |
| GBC19DRES-S734 | CONN EDGECARD 38POS .100 EYELET |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX749ESA-TG074 | 制造商:Maxim Integrated Products 功能描述:DIGITALLY ADJUSTABLE LCD BIAS SUPPLY - Rail/Tube |
| MAX749EVKIT-SO | 功能描述:显示开发工具 RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
| MAX-750 | 制造商:SLPOWER 制造商全称:SL Power Electronics 功能描述:MAX-750 Multiple Output |
| MAX7500EVKIT+ | 功能描述:板上安装温度传感器 MAX7500 Eval Kit RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| MAX7500MSA | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
发布紧急采购，3分钟左右您将得到回复。