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| 型号： | ISL97693IRTZ |
| 厂商： | Intersil |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR BACKLIGHT 16TQFN |
| 标准包装： | 100 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 频率： | 400kHz ~ 1.5MHz |
| 电源电压： | 2.5 V ~ 5.5 V |
| 输出电压： | 26V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN（3x3） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
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ISL97692, ISL97693, ISL97694A
Theory of Operation
The reciprocal of this calculation gives the effective resolution of
the PWM control per Equation 4:
PWM Resolution = -------------------------------------------------------------------------------
PWM Boost Converter
The current mode PWM boost converter produces the minimal
voltage needed to enable the LED stack with the highest forward
1
80ns × Input PWM Frequency
(EQ. 4)
voltage drop to run at the programmed current. The
ISL97692/3/4A employs current mode control boost
For example, for a 200Hz input PWM frequency, the minimum
duty cycle is:
PWM Resolution = -------------------------------------- = 14286 = 13.5bits
architecture that has a fast current sense loop and a slow voltage
feedback loop. This architecture achieves the fast transient
response, which is essential for portable product backlight
applications where the backlight must not flicker when the
power source is changed from a drained battery to an AC/DC
adapter.
Min Duty Cycle = 350ns × 200Hz = 0.007%
The effective resolution at 200Hz is 13? bits:
1
80ns × 200Hz
(EQ. 5)
(EQ. 6)
The number of LEDs that can be driven by ISL97692/3/4A
depends on the type of LED chosen in the application. The
maximum output is 26V at 40mA from 2.7V input.
Enable
Take the EN input high to enable the ISL97692/3/4A for normal
operation and low to enter low-power shutdown.
Dimming Controls
The ISL97692/3/4A allows the LED current to be programmed in
the range 2mA to 40mA (ISL97692) or 2mA to 30mA
(ISL97693/4A) by R SET per Equation 1:
Phase Shift Control
The ISL97692/4A are capable of delaying the phase of each
current source. Conventional LED drivers exhibit the worst load
transients to the boost circuit by turning on all channels
simultaneously, as shown in Figures 21 and 23. In contrast, the
ISL97692/4A phase shift each channel by turning them on once
during each PWM dimming period, as shown in Figures 22 and
24. At each dimming duty cycle (except at 100%) the sum of the
phase shifted total current will be less than a conventional LED
drivers’ total current.
For ISL97692/4A, the channels are separated by 360°/N, where
N is number of channels enabled. For example, if 3 channels are
I LEDmax = ---------------
1066
R SET
(EQ. 1)
enabled, they will be separated by 120°.
If the channels are combined for higher current application, the
Where:
- R SET is the resistor from ISET pin to GND ( Ω)
- I LEDmax is the peak current set by resistor R SET (A)
For example, if the required LED current (I LEDmax ) is 40mA, then
the R SET value needed is:
phase shift function must be disabled by connecting the ENPS
pin to ground.
ILED1-20mA
ILED2-20mA
R SET = 1066 ? 0.04 = 26.65k Ω
(EQ. 2)
ILED3-20mA
Choose the nearest standard resistor: 26.65k Ω, 0.1%
Direct PWM Dimming
The ISL97693 always operates in Direct PWM dimming mode.
ILED4-20mA
ILED_Total_80mA
The ISL97692 and ISL97694A can be selected to operate in
5
10
15
Direct PWM dimming mode by connecting the FPWM pin to VIN
and the SCL pin of ISL97694A must be tied to GND.
With Direct PWM, the channel outputs follow the input PWM
signal’s frequency and pulse width, as provided to the PWMI pin.
When PWMI is high, all channels sink the current set by the R SET
resistor. When PWMI is low, all channels are high-Z.
The maximum allowed input PWM frequency at PWMI is 30kHz.
The minimum duty is calculated by Equation 3 according to the
input PWM frequency, and is set by the minimum channel
on-time of 350ns.
TIME (ms)
FIGURE 21. CONVENTIONAL 4-CH LED DRIVER WITH 10% PWM
DIMMING CHANNEL CURRENT (UPPER) AND TOTAL
CURRENT (LOWER)
Min Duty Cycle = 350ns × Input PWM Frequency
15
(EQ. 3)
FN7839.4
December 20, 2012
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97693IRTZ-T | 功能描述:IC LED DRVR BACKLIGHT 16TQFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| ISL97693IRTZ-TK | 功能描述:IC LED DRVR BACKLIGHT 16TQFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| ISL97694AIRTZ | 制造商:Intersil Corporation 功能描述:6 CH W/12-BIT PWM DIMMING SINGLE CELL LI-ION BATTERY POWERED - Rail/Tube 制造商:Intersil Corporation 功能描述:IC LED DRVR BACKLIGHT 20TQFN |
| ISL97694AIRTZ-T | 制造商:Intersil Corporation 功能描述:6 CH W/12-BIT PWM DIMMING SINGLE CELL LI-ION BATTERY POWERED - Tape and Reel 制造商:Intersil Corporation 功能描述:IC LED DRVR BACKLIGHT 20TQFN |
| ISL97694AIRTZ-TK | 功能描述:LED照明驱动器 6CH w/12Bit Dimming Li-Ion 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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