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參數(shù)資料
| 型號(hào)： | MAX1542 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | TFT LCD DC-to-DC Converter with Operational Amplifiers |
| 中文描述： | TFT LCD DC-DC轉(zhuǎn)換器，帶有運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 10/20頁(yè) |
| 文件大小： | 506K |
| 代理商： | MAX1542 |
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M
TFT LCD DC-to-DC Converter with
Operational Amplifiers
10
______________________________________________________________________________________
Pin Description (continued)
PIN
MAX1542
14
MAX1543
14
NAME
FUNCTION
IN
Supply Voltage. IN can range from 2.6V to 5.5V.
—
15
FREQ
Oscillator Frequency Select Input. Pull FREQ low or leave it unconnected for 640kHz
operation. Connect FREQ high for 1.2MHz operation. This input has a 5μA pulldown
current.
16
16
FB
Step-Up Converter Feedback Input. Regulates to 1.24V (nominal). Connect a resistor-
divider from the output (V
MAIN
) to FB to analog ground (AGND). Place the resistor-divider
within 5mm of FB.
17
17
COMP
Step-Up Regulator Error Amplifier Compensation Point. Connect a series RC from COMP
to AGND. See the
Loop Compensation
section for component selection guidelines.
High-Voltage Switch Delay Input. Connect a capacitor from DEL to AGND to set the high-
voltage switch startup delay. A 5μA current source charges C
DEL
.
18
18
DEL
For the MAX1542, the high-voltage switch between SRC and COM is disabled until V
DEL
exceeds 1.24V. Following the delay period, CTL controls the state of the high-voltage
switch.
For the MAX1543, the switches between SRC, COM, and DRN are disabled and a 1k
pulldown between COM and PGND is enabled until V
DEL
exceeds 1.24V. Following the
delay period, the 1k
pulldown is released and CTL controls the state of the high-voltage
switches (see the
Delay Control Circuit
section).
High-Voltage Switch Control Input. When CTL is high, the high-voltage switch between
COM and SRC is on and the high-voltage switches between COM and DRN (MAX1543)
are off. When CTL is low, the high-voltage switch between COM and SRC is off and the
high-voltage switches between COM and DRN (MAX1543) are on. CTL is inhibited by the
undervoltage lockout and when V
DEL
is less than 1.24V.
19
19
CTL
—
20
DRN
Switch Input. Drain of the internal high-voltage back-to-back P-channel MOSFETs
connected to COM.
Typical Application Circuits
The MAX1542 typical application circuit (Figure 1) and
the MAX1543 typical application circuit (Figure 2) gen-
erate an +8V source driver supply and approximately
+22V and -7V gate driver supplies for TFT displays. The
input voltage is from +2.6V to +5.5V. Table 1 lists rec-
ommended components and Table 2 lists contact infor-
mation for component suppliers.
Detailed Description
The MAX1542/MAX1543 include a high-performance
step-up regulator, two high-current operational ampli-
fiers, and startup timing and level-shifting functionality
useful for active matrix TFT LCDs. Figure 3 shows the
MAX1542/MAX1543 functional diagram.
Main Step-Up Converter
The MAX1542/MAX1543 main step-up converter
switches at 1.2MHz or 640kHz (MAX1543 only) (see the
Oscillator Frequency (FREQ)
section). The devices
employ a current-mode, fixed-frequency, pulse-width
modulation (PWM) architecture to maximize loop band-
width providing fast transient response to pulsed loads
found in source drivers for TFT LCD panels. The high-
switching frequency also allows the use of low-profile
inductors and capacitors to minimize the thickness of
LCD panel designs. The integrated high-efficiency
MOSFET and the IC
’
s built-in digital soft-start function
reduce the number of external components required
while controlling inrush current. The output voltage of
the main step-up converter (V
MAIN
) can be set from V
IN
to 13V with an external resistive voltage-divider at FB.
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| MAX15425EVKIT# | 功能描述:顯示開(kāi)發(fā)工具 Eval Kit for the MAX15425 (Intel CPU Controller) RoHS:否 制造商:4D Systems 產(chǎn)品:4Display Shields 工具用于評(píng)估:?OLED-160-G1, ?OLED-160-G2 接口類型:Serial 工作電源電壓:5 V |
| MAX1542ETP | 功能描述:LCD 驅(qū)動(dòng)器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX1542ETP+ | 功能描述:LCD 驅(qū)動(dòng)器 TFT LCD DC/DC Conv w/Op Amps RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX1542ETP+T | 功能描述:LCD 驅(qū)動(dòng)器 TFT LCD DC/DC Conv w/Op Amps RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX1542ETP-T | 功能描述:LCD 驅(qū)動(dòng)器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
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