參數(shù)資料
型號(hào)： MAX1542-MAX1543
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： 液晶式DC - DC轉(zhuǎn)換器的運(yùn)算放大器
文件頁(yè)數(shù)： 12/20頁(yè)
文件大小： 506K
代理商： MAX1542-MAX1543
M
TFT LCD DC-to-DC Converter with
Operational Amplifiers
12
______________________________________________________________________________________
Delay Control Circuit
A capacitor from DEL to AGND selects the switch control
block supply startup delay. After the input voltage
exceeds V
UVLO
, a 5μA current source charges C
DEL
.
Once the capacitor voltage exceeds the turn-on thresh-
old (1.24V) COM can be connected to SRC, depending
on the state of CTL. Before startup and when IN is less
than V
UVLO
, DEL is internally connected to AGND to dis-
charge C
DEL
. Select C
DEL
using the following equation:
MAX1542 Control Block Switch
The switch control input (CTL) is not activated until
V
DEL
exceeds the turn-on voltage (1.24V) and the input
voltage (V
IN
) exceeds V
UVLO
(2.5V). Once activated,
CTL controls the P-channel MOSFET, between COM
and SRC. A high at CTL turns on Q1 between SRC and
COM, and a low at CTL turns Q1 off (Figure 4).
MAX1543 Control Block Switch
The switch control input (CTL) is not activated until the
input voltage (V
IN
) exceeds V
UVLO
(2.5V) and V
DEL
exceeds the turn-on voltage (1.24V). During UVLO or
when DEL is below the turn-on threshold, COM is
pulled low to PGND through Q3 and a 1k
resistance.
Once activated, CTL controls the COM MOSFETs,
switching COM between SRC and DRN. A high at CTL
turns on Q1 and disables Q2. A low at CTL turns on Q2
and turns off Q1 (Figure 4).
Undervoltage Lockout (UVLO)
The UVLO comparator of the MAX1542/MAX1543 com-
pares the input voltage at IN with the UVLO threshold
C
DELAY TIME
(
A
V
DEL
=
×
)
.
5
1 24
μ
LX
IN
AGND
PGND
DEL
CTL
COM
SRC
COMP
POS2
OUT2
POS1
OUT1
NEG2
NEG1
SUP
FB
D1
V
MAIN
+8V AT 250mA
TO VCOM
BACKPLANE
D2
D3
D4
-7V AT 20mA
G_OFF
G_ON
+22V AT 20mA
MAX1542
R8
100k
C11
220pF
C10
33nF
V
2.6V TO 5.5V
C1
10
μ
F
L1
4.7
μ
F
C2
0.1
μ
F
C3
0.1
μ
F
C4
0.1
μ
F
C5
0.1
μ
F
C6
0.1
μ
F
C8
4.7
μ
F
R1
75k
C9
4.7
μ
F
C7
0.1
μ
F
R5
40k
R6
40k
R2
13.7k
R3
40k
R4
40k
Figure 1. MAX1542 Typical Application Circuit
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1543ETP 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
MAX1543ETP+ 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
MAX1543ETP+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
MAX1543ETP-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
MAX1543EVKIT 功能描述:顯示開(kāi)發(fā)工具 MAX1542/3 Eval Kit 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
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