参数资料
| 型号： | MAX8709BETI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR CCFL HI EFF 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | CCFL 控制器 |
| 频率： | 25 ~ 300 kHz |
| 电流 - 电源： | 1.5mA |
| 电流 - 输出： | 500mA |
| 电源电压： | 4.6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
High-Efficiency CCFL Backlight
Controller with SMBus Interface
Table 1. Component List
DESIGNATION
C1
C2
C3
C4
DESCRIPTION
4.7μF ±20%, 25V X5R
ceramic capacitor (1210)
Murata GRM32RR61E475K
Taiyo Yuden TMK325BJ475MN
TDK C3225X7R1E475M
1μF ±10%, 25V X7R
ceramic capacitor (1206)
Murata GRM31MR71E105K
Taiyo Yuden TMK316BJ105KL
TDK C3216X7R1E105K
15pF ±1pF, 3kV high-voltage
ceramic capacitor (1808)
Murata GRM42D1X3F150J
TDK C4520C0G3F150F
0.022μF ±10%, 16V X7R
ceramic capacitor (0402)
Murata GRP155R71C223K
Taiyo Yuden EMK105BJ223KV
DESIGNATION
C7
D1
NH1/2, NL1/2
R1
R2
R3
R4, R5
T1
DESCRIPTION
0.47μF ±10%, 10V X5R
ceramic capacitor (0603)
Taiyo Yuden LMK107BJ474KA
TDK C1608X5R1A474K
Dual silicon switching diode,
common anode (SOT-323)
Central Semiconductor CMSD2836
Diodes Incorporated BAW56W
30V, 0.095 dual n-channel MOSFETs
(6-pin SOT23)
Fairchild FDC6561AN
150 Ω ±1% resistor (0603)
2k Ω ±5% resistor (0603)
39 Ω ±1% resistor (0603)
100k Ω ±5% resistors (0603)
CCFL transformer, 1:93 turns ratio
Sumida 5371-400-W1423
TOKO T912MG-1018
TDK C1005X7R1C223K
0.1μF ±10%, 25V X7R
ceramic capacitors (0603)
Detailed Description
The MAX8709B controls a full-bridge resonant inverter to
C5, C6, C8, C9
Murata GRM188R71E104K
Taiyo Yuden TMK107BJ104KA
TDK C1608X7R1E104K
convert an unregulated DC input into a near-sinusoidal
AC output for powering CCFLs. The lamp brightness is
adjusted by turning the lamp on and off with an internal
DPWM signal. The duty cycle of the DPWM signal is set
Table 2. Component Suppliers
through an SMBus-compatible 2-wire serial interface.
Figure 2 shows the functional diagram of the MAX8709B.
SUPPLIER
Central Semiconductor
Fairchild Semiconductor
Murata
Sumida
Taiyo Yuden
TDK
WEBSITE
www.centralsemi.com
www.fairchildsemi.com
www.murata.com
www.sumida.com
www.t-yuden.com
www.components.tdk.com
Resonant Operation
The MAX8709B drives the four n-channel power
MOSFETs that make up the zero-voltage-switching
(ZVS) full-bridge inverter as shown in Figure 3. Assume
that NH1 and NL2 are turned on at the beginning of a
switching cycle as shown in Figure 3(a). The primary cur-
rent flows through MOSFET NH1, DC blocking cap C2,
the primary side of transformer T1, and MOSFET NL2.
During this interval, the primary current ramps up until the
Typical Operating Circuit
The Typical Operating Circuit of the MAX8709B (Figure 1)
is a complete CCFL backlight inverter for notebook TFT
LCD panels. The circuit works over an input voltage
range of 7V to 24V with an RMS lamp current of 6mA.
The circuit’s maximum RMS open-lamp voltage is limit-
ed to 1600V. Table 1 lists recommended component
options, and Table 2 lists the component suppliers’
contact information.
controller turns off NH1. When NH1 turns off, the primary
current forward biases the body diode of NL1, which
clamps the LX1 voltage just below ground as shown in
Figure 3(b). When the controller turns on NL1, its drain-to-
source voltage is near zero because its forward-biased
body diode clamps the drain. Since NL2 is still on, the pri-
mary current flows through NL1, C2, the primary side of
T1, and NL2. Once the primary current drops to the mini-
mum current threshold (6mV / R DS(ON) ), the controller
turns off NL2. The remaining energy in T1 charges up the
LX2 node until the body diode of NH2 is forward biased.
______________________________________________________________________________________
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8709ETI | 功能描述:显示驱动器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX8709ETI+ | 功能描述:显示驱动器和控制器 CCFL Backlight Controller w/SMBus RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX8709ETI+T | 功能描述:显示驱动器和控制器 CCFL Backlight Controller w/SMBus RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX8709ETI-T | 功能描述:显示驱动器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX8709EVKIT | 功能描述:显示开发工具 MAX8709 Eval Kit 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 |
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