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參數(shù)資料
| 型號(hào)： | MAX8740 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類(lèi)： | DC/DC變換器 |
| 英文描述： | TFT-LCD Step-Up DC-DC Converter |
| 中文描述： | TFT-LCD升壓型DC-DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大小： | 341K |
| 代理商： | MAX8740 |
M
TFT-LCD Step-Up DC-DC Converter
10
______________________________________________________________________________________
Multiple-Output Power Supply for TFT LCD
Figure 3 shows a power supply for active-matrix TFT-
LCD flat-panel displays. Output-voltage transient perfor-
mance is a function of the load characteristic. Add or
remove output capacitance (and recalculate compensa-
tion-network component values) as necessary to meet
the required transient performance. Regulation perfor-
mance for secondary outputs (V2 and V3) depends on
the load characteristics of all three outputs.
PC Board Layout and Grounding
Careful PC board layout is important for proper operation.
Use the following guidelines for good PC board layout:
1) Minimize the area of high-current loops by placing
the inductor, rectifier diode, and output capacitors
near the input capacitors and near the LX and GND
pins. The high-current input loop goes from the
positive terminal of the input capacitor to the induc-
tor, to the IC’s LX pin, out of GND, and to the input
capacitor’s negative terminal. The high-current out-
put loop is from the positive terminal of the input
capacitor to the inductor, to the rectifier diode (D1),
and to the positive terminal of the output capacitors,
reconnecting between the output capacitor and
input capacitor ground terminals. Connect these
loop components with short, wide connections.
Avoid using vias in the high-current paths. If vias
are unavoidable, use many vias in parallel to
reduce resistance and inductance.
2) Create a power ground island (PGND) consisting of
the input and output capacitor grounds and GND
pins. Connect all of these together with short, wide
traces or a small ground plane. Maximizing the
width of the power ground traces improves efficien-
cy and reduces output voltage ripple and noise
spikes. Create an analog ground plane (AGND)
consisting of the feedback-divider ground connec-
tion, the COMP and SS capacitor ground connec-
tions, and the device’s exposed backside pad.
Connect the AGND and PGND islands by connect-
ing the GND pins directly to the exposed backside
pad. Make no other connections between these
separate ground planes.
LX
LX
FB
GND
GND
FREQ
IN
COMP
SS
1
4
5
2
3
9
8
6
7
10
V
IN
4.5V TO 5.5V
SHDN
MAX8740
C1
10
μ
F
6.3V
R4
10
C5
1
μ
F
C4
33nF
C3
560pF
C6
68pF
L1
2.7
μ
H
D1
R2
20k
1%
R3
47k
1%
R1
196k
1%
V2
+28V
C9
1
μ
F
D2
D3
C7
0.1
μ
F
C8
0.1
μ
F
V3
-10V
C10
0.22
μ
F
V
OUT
13.5V/800mA
C2
10
μ
F
25V
C7
10
μ
F
25V
Figure 3. Multiple-Output TFT-LCD Power Supply
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX8740ETB | TFT-LCD Step-Up DC-DC Converter |
| MAX878LCPA | Analog IC |
| MAX8710 | LCD display panel power supply TFT Monitor TV |
| MAX8711 | LCD display panel power supply TFT Monitor TV |
| MAX8712 | LCD display panel power supply TFT Monitor TV |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8740ETB | 制造商:Maxim Integrated Products 功能描述:LOW COST LCD MONITOR PANEL POWER SU - Rail/Tube |
| MAX8740ETB+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX8740ETB+T | 功能描述:LCD 驅(qū)動(dòng)器 TFT-LCD Step-Up DC/DC Converter 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 |
| MAX8740ETB-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 |
| MAX8740EUB+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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