- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385521 > MAX1514ETP (MAXIM INTEGRATED PRODUCTS INC) TFT-LCD Power-Supply Controllers PDF資料下載
參數(shù)資料
| 型號： | MAX1514ETP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | TFT-LCD Power-Supply Controllers |
| 中文描述： | SWITCHING CONTROLLER, 1725 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 4 X 4 MM, 0.80 MM HEIGHT, MO-220-VGGD, TQFN-20 |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 540K |
| 代理商： | MAX1514ETP |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁當(dāng)前第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
M
TFT-LCD Power-Supply Controllers
______________________________________________________________________________________
15
Logic Linear-Regulator Controller
The logic linear-regulator controller (REG L) is an analog
gain block with an open-drain N-channel output. It dri-
ves an external PNP pass transistor with a 680
base-
to-emitter resistor (Figure 1). Its guaranteed base-drive
sink current is at least 10mA. The regulator, including
transistor Q1 in Figure 1, uses a 10μF ceramic output
capacitor and is designed to deliver 500mA at 3.3V.
Other output voltages and currents are possible by scal-
ing the pass transistor, input capacitor, and output
capacitor. See the
Pass-Transistor Selection
and
Stability Requirements
sections.
REG L is typically used to generate low-voltage logic
supplies for the timing controller and the digital sec-
tions of the TFT-LCD source/gate-drive ICs.
REG L is automatically enabled when the input voltage
is above the UVLO threshold. Each time it is enabled,
the controller goes through a soft-start routine that
ramps up its internal reference DAC in 128 steps.
Gate-Off Linear-Regulator Controller
The gate-off linear-regulator controller (REG N) is an ana-
log gain block with an open-drain P-channel output. It dri-
ves an external NPN pass transistor with a 3.6k
base-to-emitter resistor (Figure 1). Its guaranteed base-
drive source current is at least 2mA. The regulator,
including Q2 in Figure 1, uses a 0.47μF ceramic output
capacitor and is designed to deliver 30mA at -10V. Other
output voltages and currents are possible by scaling the
pass transistor, input capacitor, and output capacitor.
See the
Pass-Transistor Selection
and
Stability Require-
ments
sections.
REG N is typically used to provide the TFT-LCD gate dri-
vers’ gate-off voltage. A negative voltage can be pro-
duced using a charge-pump circuit as shown in Figure 1.
REG N is enabled after the logic linear-regulator REG L
soft-start has completed. Each time it is enabled, the
control goes through a soft-start routine that ramps
down its internal reference DAC from V
REF
to 250mV in
about 100 steps.
Gate-On Linear-Regulator Controller
The gate-on linear-regulator controller (REG P) is an
analog gain block with an open-drain N-channel output.
It drives an external PNP pass transistor with a 6.8k
base-to-emitter resistor (Figure 1). Its guaranteed base-
drive sink current is at least 1mA. The regulator includ-
ing Q3 in Figure 1 uses a 0.47μF ceramic output
capacitor and is designed to deliver 20mA at 25V.
Other output voltages and currents are possible by
scaling the pass transistor, input capacitor, and output
capacitor. See the
Pass-Transistor Selection
and
Stability Requirement
s sections.
REG P is typically used to provide the TFT-LCD gate
drivers’ gate-on voltage. Use a charge pump with as
many stages as necessary to obtain a voltage exceed-
ing the required gate-on voltage (see the
Selecting the
Number of Charge-Pump Stages
section). Note that the
voltage rating of the DRVP output is 28V. If the charge-
pump output voltage can exceed 28V, an external cas-
code-connected NPN transistor should be added
(Figure 6). Alternately, the linear regulator can control
an intermediate charge-pump state while regulating the
final charge-pump output (Figure 7).
REG P is enabled after the step-up regulator soft-start
has completed and the voltage on DEL exceeds 1.25V.
Each time it is enabled, the controller goes through a
soft-start routine that ramps up its internal reference DAC
in 128 steps.
MAX1513
MAX1514
DRVP
FBP
V
MAIN
FROM CHARGE-
PUMP OUTPUT
PNP PASS
TRANSISTOR
NPN CASCODE
TRANSISTOR
V
GON
Figure 6. Using an NPN Cascode for Charge-Pump Output
Voltages > 28V
MAX1513
MAX1514
DRVP
FBP
0.1
μ
F
0.1
μ
F
0.47
μ
F
0.22
μ
F
LX
V
MAIN
13V
V
GON
35V
6.8k
267k
1%
10.0k
1%
Q1
Figure 7. Linear Regulator Controls Intermediate Charge-Pump
Stage
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1518B | TFT-LCD DC-DC Converter with Operational Amplifiers |
| MAX1518BETJ | TFT-LCD DC-DC Converter with Operational Amplifiers |
| MAX1538ETI | Power-Source Selector for Dual-Battery Systems |
| MAX154 | CMOS High-Speed 4-Bit ADCs with Multiplexer and Reference(8位,4通道,400ksps,并行A/D轉(zhuǎn)換器) |
| MAX1558 | Dual, 3mm x 3mm, 1.2A/Programmable-Current USB Switches with Autoreset |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1514ETP+T | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1514ETP-T | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1515ETG | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX1515ETG+ | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A 1MHz Step-Down DDR Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX1515ETG+T | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A 1MHz Step-Down DDR Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。