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参数资料
| 型号： | MAX8790AETP+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 16/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 4.5 V ~ 5.5 V，5.5 V ~ 26 V |
| 输出电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
The PLL is disabled in DPWM mode; consequently, the
BRT frequency is not limited by f PLL . The maximum
BRT frequency is determined by the minimum BRT on-
time of 50μs and the minimum acceptable dimming
factor. If a 1% dimming factor is needed, the maximum
BRT frequency is 200Hz. If a 10% dimming factor is
acceptable, the maximum BRT frequency is 2kHz.
In analog dimming mode, load-current transients can
occur when the BRT frequency abruptly changes on the
fly. Large regulation transients induce a flash on the LED
load that is observable with the naked eye and should
therefore be avoided. Such annoying flashes can be
eliminated by dynamically changing the ENA pin setting.
When a capacitor is connected to the CPLL pin and the
ENA pin is grounded, the PLL continues to run but does
not affect the dimming. When fast PLL lockup transitions
are required, the ENA pin can be momentarily pulled to
Table 3. Component List
ground; after the PLL is locked up, ENA can be pulled
high to reenable PLL in dimming control.
Thermal Shutdown
The MAX8790A includes a thermal-protection circuit.
When the local IC temperature exceeds +170°C (typ),
the controller and current sources shut down and do
not restart until the die temperature drops by 15°C.
Design Procedure
All MAX8790A designs should be prototyped and tested
prior to production. Table 3 provides a list of power
components for the typical applications circuit. Table 4
lists component suppliers. External component value
choice is primarily dictated by the output voltage and the
maximum load current, as well as maximum and minimum
input voltages. Begin by selecting an inductor value.
Once L is known, choose the diode and capacitors.
CIRCUIT
Switching
Frequency
White LED
Number of
White LEDs
FIGURE 1
1MHz
3.2V (typ), 3.5V (max) at
20mA
Nichia NSSW008C
6 series x 6 parallel,
20mA (max)
FIGURE 1
750kHz
3.2V (typ), 3.5V (max) at
20mA
Nichia NSSW008C
8 series x 6 parallel,
20mA (max)
FIGURE 1
500kHz
3.2V (typ), 3.5V (max) at
20mA
Nichia NSSW008C
10 series x 6 parallel,
25mA (max)
FIGURE 3
750kHz
3.2V (typ), 3.5V (max) at
20mA
Nichia NSSW008C
6 series x 6 parallel,
20mA (max)
Input Voltage 4.5V to 5.5V, V CC = IN
7V to 21V
7V to 21V
2.8V to 5.5V, V CC = 5V
Inductor L1
2.2μH, 2.5A power inductor
Sumida CDRH5D16-2R2
4.7μH, 2.05A power inductor
Sumida CDRH5D16-4R7
4.7μH, 3.6A power inductor
Sumida CDRH8D28-4R7
0.9μH, 4.7A power inductor
Sumida CDRH5D16-0R9
Input
Capacitors
10μF ±10%, 10V X5R 10μF ±10%, 25V X5R 10μF ±10%, 25V X5R
ceramic capacitor (1206) ceramic capacitor (1206) ceramic capacitor (1206)
Murata GRM31MR61A106K Murata GRM31CR61E106KA Murata GRM31CR61E106KA
10μF ±10%, 10V X5R
ceramic capacitor (1206)
Murata GRM31MR61A106K
C OUT Output
Capacitor
2.2μF ±10%, 50V X7R
ceramic capacitor (1x)
Murata GRM31CR71H225K
2.2μF ±10%, 50V X7R
ceramic capacitor (1206)
(1x)
Murata GRM31CR71H225K
4.7μF ±10%, 50V X7R
ceramic capacitor (1210)
(1x)
Murata GRM32ER71H475K
2.2μF ±10%, 50V X7R
ceramic capacitor (1x)
Murata GRM31CR71H225K
60V, 2.8A n-channel
MOSFET N1
30V, 3A n-channel MOSFET
(6-pin SC70)
Vishay Si1402DH
MOSFET (6-pin TSOP)
Fairchild Semiconductor
FDC5612
Sanyo Semiconductor
60V, 6A n-channel MOSFET
(PowerPAK 1212-8)
Vishay Si7308DN
30V, 4.9A n-channel
MOSFET (6-pin TSOP)
Vishay Si3456BDV
CPH6424
Diode
Rectifier D1
Sense
Resistor
2A, 30V Schottky diode
Nihon EC21QS03L
50m Ω ±1%, 1/2W
IRC LRC-LRF-1206LF-01-
R050-F
2A, 40V Schottky diode
Toshiba CMS11
Nihon EC21QS04
56m Ω ±1%, 1/2W
IRC LRC-LRF-1206LF-01-
R056-F
3A, 60V Schottky diode
Nihon EC31QS06
40m Ω ±1%, 1/2W
IRC LRC-LRF-1206LF-01-
R040-F
3A, 30V Schottky diode
Nihon EC31QS03L
30m Ω ±1%, 1/2W
IRC LRC-LRF-1206LF-01-
R030-F
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8790AETP+ | 功能描述:LED照明驱动器 Six-String White LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8790AETP+T | 功能描述:LED照明驱动器 Six-String White LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8790AETP+X01 | 功能描述:LED照明驱动器 Six-String White LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8790AEVKIT+ | 功能描述:LED 照明开发工具 MAX8790A Eval Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX8790ETP+ | 功能描述:LED照明驱动器 Six-String White LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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