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参数资料
| 型号： | BD6581GU-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 12/35页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT BCKLGHT VCSP85H2 |
| 标准包装： | 3,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 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： | 44.7 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 23-VFBGA，CSPBGA |
| 供应商设备封装： | VCSP85H2 |
| 包装： | 带卷 (TR) |
| 工作温度： | -30°C ~ 85°C |
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BD6581GU
Datasheet
● Description of Functions
1) PWM current mode DC/DC converter
While BD6581GU is power ON, the lowest voltage of LED1, 2, 3, 4, 5, 6 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.
BD6581GU has many safety functions, and their detection signals stop switching operation at once.
2) Soft start
BD6581GU has soft start function.
The soft start function prevents large coil current.
Rush current at turning on is prevented by the soft start function.
After RSTB is changed L ? H, when PWMPOW is changed L ? H, soft start becomes effective for within 1ms and soft
start doesn't become effective even if PWMPOW is changed L ? H after that.
And, when the H section of PWMPOW is within 1ms, soft start becomes invalid when PWMPOW is input to H more than
three times. The invalid of the soft start can be canceled by making RSTB ? L.
3) FAILSEL pin
When the error condition occurs, boost operating is stopped by the protection function, and the error condition is avoided.
On that occasion, the way to stop of boost operating by the protection function can be selected with FAILSEL pin. Details
are as shown in Figure 26, 27.
After power ON, when the protection function is operating under about 1ms have passed, the stop state of the boost
operating can be held through FAILSEL is H, the stop state can reset through RSTB is L.
And, boost operating is stopped when the protection function is operating through FAILSEL is L, but when the protection
function becomes un-detect, boost operating is started again. It never keeps holding the stop state of boost operating.
In PWM control by PWMDRV can’t use this function.
When it is off over 10ms on PWM control by PWMPOW using this function, it may be stopped the boost operating
as over current protection work at off on PWMPOW=L.
Object of protect function is as shown below.
? Over-voltage protection
? External SBD open detect
? Thermal shutdown
? LED terminal over-voltage protection
? Over current limit
<FAILSEL=H>
RSTB
< When it is off on PWMPOW>
RSTB
FAILSEL
“H”
about 1ms
un-operating range
PWMDRV
PWMPOW
Output
Protection
un-detection
detection
un-detection
voltage
function
Coil current
Boost
operating
off
normal operating
boost stop
off
normal operating
FAILSEL
function
invalid
valid
<FAILSEL=L>
< When it is off on RSTB>
RSTB
RSTB
about 1ms
PWMDRV
FAILSEL
“L”
un-operating range
PWMPOW
Output
Protection
function
un-detectio
detection
un-detection
voltage
Coil current
Boost
operating
off
normal operating
boost stop
normal
operating
off
normal
FAILSEL
function
invalid
Figure 26. FAILSEL operating description
Figure 27. FAILSEL=H light off control
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
12/32
TSZ02201-0G3G0C400170-1-2
03.Dec.2012 Rev.001
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| BD6583MUV-AE2 | 功能描述:IC LED DRIVER WHIT BCKLGT 24VQFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
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