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| 型号： | MIC3263YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER 6CH BKLT 24-MLF |
| 特色产品： | MIC3263 Boost Switching Regulator |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 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： | 400kHz ~ 1.8MHz |
| 电源电压： | 6 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘，24-MLF? |
| 供应商设备封装： | 24-MLF?（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 576-3663-6 MIC3263YML TRDKR MIC3263YML TRDKR-ND |
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Micrel, Inc.
MIC3263
OVP
An open LED in a channel will not trigger an OVP. OVP
monitors the boost output voltage. If an open o ccurs on the
load (all channels open) an OVP fault will trigger a n over-
voltage condition. When the OVP triggers, it turns off the
boost and starts an OVP cycle. If one, tw o, o r three
C o ndition
1 L ED Shorts
2 L EDs Shor t
in Same
Fault
NO
NO
Monitor
IO > 1.2V
1.2 < IO < 7.5
Result
All Channels
On
All Channels
On
channels open, they will not trigger an OVP . Fou r open
Channel
channels will trigger an OVP fault and will cycl e on an d off
at about 2Hz as long as there are four open chan nels. If
one of the LED channels is reconnected (not open), then
operation returns to no rmal for those three chann els th at
are reconnected with ou t having to go through a po wer on
reset.
M o re Than 2
LEDs Short
in Same
C h annels
1 LED Opens
in C hannel 1
YES
YES
IO > 7.5V
IO < 0.5V
1 Channel
Off; 5
Channels On
1 Channel
Off; 5
In t he even t of a load o pening (four or more ch annels
Channels On
open) the following will occur:
1. VIO will drop below 1V
2 . Charge pump will raise CRV during each DR pulse
on-time
3. CRV will increase to 2.4V
4. When CRV reaches 2.4V the bo ost output
maximum voltage will be; V OUT_MA X = 2.4*
(R2+R2)/R1.
2 or 3
C h annels
Op en LEDs
4 o r More
Ch annels
Open
All Channels
Open
YES
YES
YES
IO < 0.5V
IO < 0.5V
OVP
Threshold
Exceeded
3 Channels
Off; 3
Channels On
4 Channels
Off; 2
Channels On
OVP
Triggered
5. Feedback V OVP will reach 2.4V and the OVP
comparator will trip and turn off the boos ter.
6. With the booster off, V OUT and V OVP will discharge.
When feedback reduces to 1.7V the booster is
turned back on.
V OUT Shorted
YES Curren t Limit
Exceed ed
Table 1. Fault Summary
Output
Current is
Limited
7. The OVP circuit will switch 1.8V onto CR V
8. If the load is still open the cycle will co ntinue.
Power-O n Sequence
V IN needs t o be present before PWM pulses are applied to
the DRC pin. Some channels may not turn on if the power
up sequence isn’t followed. This is because the circuits
that monitor the IO pins may see transients during the turn
on-time and may interpret voltage spikes during turn on as
a fault, preventing that channel from turning on. When a
channel is off, its IO pin is at high impedance.
It is best to follow the sequence:
1. V IN
2. PWM dimming at DRC
3. Enable high
January 2010
14
M9999-012110
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC3287 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL |
| MIC3287_10 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL |
| MIC3287-24YD6 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC3287-24YD6 TR | 功能描述:LED照明驱动器 2x2mm White LED Driver w/ 24V OVP (Lead Free) 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 |
| MIC3287-24YD6TR | 制造商:RF Micro Devices Inc 功能描述: |
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