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参数资料
| 型号： | BD6066GU-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 7/18页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 17VCSP |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 800kHz ~ 1.2MHz |
| 电源电压： | 2.7 V ~ 22 V |
| 输出电压： | 40.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 17-VFBGA，CSPBGA |
| 供应商设备封装： | VCSP85H2 |
| 包装： | 标准包装 |
| 工作温度： | -30°C ~ 85°C |
| 产品目录页面： | 1371 (CN2011-ZH PDF) |
| 其它名称： | BD6066GU-E2DKR |
BD6066GU,BU6066EKN
Technical Note
● Description of Functions
1) PWM current mode DC/DC converter
While BD6066GU/EKN is power ON, the lowest voltage of LED1, 2, 3, 4 is detected, PWM duty is decided to be 0.5V and
output voltage is kept invariably. As for the inputs of the PWM comparator as the feature of the PWM current mode, one is
overlapped with error components from the error amplifier, and the other is overlapped with a current sense signal that
controls the inductor current into Slope waveform to prevent sub harmonic oscillation. This output controls external Nch Tr
via the RS latch. In the period where external Nch Tr gate is ON, energy is accumulated in the external inductor, and in the
period where external Nch Tr gate is OFF, energy is transferred to the output capacitor via external SBD. BD6066GU/EKN
has many safety functions, and their detection signals stop switching operation at once.
2) Soft start and off status
BD6066GU/EKN has soft start function and off status function.
The soft start function and the off status function prevent large coil current.
Rush current at turning on is prevented by the soft start function, and invalid current at turning off is prevented by the off
status function.
3) External SBD open detect and over voltage protection
BD6066GU/EKN has over boost protection by external SBD open and over voltage protection. This function will stop the
switching. Details are as shown below.
? External SBD open detect
In the case of external SBD is not connected to IC, the coil or external Tr may be destructed. Therefore, at such an error as
VOUT becoming 0.2V or below, the Under Detector shown in the figure works, and turns off the output Tr, and prevents the
coil and the IC from being destructed.
And the IC changes from activation into non-activation, and current does not flow to the coil (0mA).
? Over voltage protection
At such an error of output open as the output DC/DC and the LED is not connected to IC, the DC/DC will boost too much
and the VDET terminal exceed the absolute maximum ratings, and may destruct the IC. Therefore, when VDET becomes
sensing voltage or higher, the over voltage limit works, and turns off the output Tr, and the pressure up made stop. At this
moment, the IC changes from activation into non-activation, and the output voltage goes down slowly. And, when the
output voltage becomes the hysteresis of the over voltage limit or below, the output voltage pressure up to sensing voltage
once again and unless the application error is recovered, this operation is repeated.
This protection action is shown in Fig.29.
Cout
VDET
SW
OVER Detector
OVER VOLTAGE REF
SBD Open Detector
SBD Open VOLTAGE REF
Control
Fig.29 Block diagram of external SBD open detect and over voltage
4) Thermal shut down
BD6066GU/EKN has thermal shut down function.
The thermal shut down works at 175 ? C or higher, and while holding the setting of EN control from the outside, the IC
changes from activation into non-activation. And at 175 ? C or below, the IC gets back to its normal action.
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
7/15
2011.06 - Rev.B
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