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| 型号： | UBA3070T/N1,118 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHITE BCKLGT 8-SOIC |
| 标准包装： | 1 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光，通用 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 145kHz ~ 205kHz |
| 电源电压： | 9.3 V ~ 10.6 V |
| 输出电压： | 11.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 标准包装 |
| 其它名称： | 568-4924-6 |
NXP Semiconductors
UBA3070
LED backlight driver IC
7. Functional description
The UBA3070 is a monolithic driver IC for controlling the current through LED strings e.g.
45 green/blue/white LEDs connected in series making the UBA3070 IC especially suitable
as an LED driver.
The driver stage enables optimal performance for series connected LED strings in 0D, 1D
and 2D segmented Backlight Units (BLUs). Since the UBA3070 drives an external power
device, it can be used for all kinds of BLU designs ranging from high-power to low-power
LEDs, and high-voltage to low-voltage LED strings. Therefore, the UBA3070 is an
excellent driver solution for all types of LEDs and LCD screen sizes. Combining the
UBA3070 with suitable power devices means the quantity of drivers can be minimized by
optimizing the quantity of series LEDs.
Each driver stage consists of a buck converter operating in BCM with its peak level
determined by an external sense resistor. Since the peak and zero levels are fixed by
design, the converter behaves as a current source. This gives an average LED current
throughput that is half the peak value of that through the inductor. The ripple current
through the LEDs can be selected by connecting an external capacitor in parallel with the
LEDs.
7.1 Supply management and UVLO
As long as V CC is below the V CC(startup) level of typically 10 V, the supply current remains
below 600 μ A. The UBA3070 IC activates the converter as soon as the voltage on the V CC
pin passes the V CC(startup) level. When the voltage on V CC pin drops below the UVLO
voltage typically 8.7 V the UBA3070 IC stops switching.
7.2 Current control and PWM
If the PWM input is HIGH (> 2 V) the converter is disabled and does not switch and, LED
current remains at zero. When the PWM input pin is LOW (< 0.5 V) the converter is
enabled and operates as follows.
The external Field-Effect Transistor (FET) is turned on and current in the inductor begins
to build up. During the charging phase of the inductor the current is sensed across an
external sense resistor. The internal driver turns off the external FET on detecting a
voltage level of 0.52 V at the SENSE pin. The inductor now starts to freewheel its current
through the external diode and starts discharging.
Following the discharge period the switch node rings. On detection of a valley or zero
voltage on the switch node the internal driver turns on the external FET. As the FET is at
zero current and minimal voltage, this results in minimal power losses and
ElectroMagnetic Interference (EMI). The conversion cycle is repeated as described
above, until the PWM input signal is driven high to disable the converter and steers the
LED current to zero.
If the PWM pin is open circuit or not connected, a fault condition is assumed and the
converter stops switching. Operation restarts as soon as the fault condition is removed.
UBA3070
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 9 December 2010
? NXP B.V. 2010. All rights reserved.
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