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參數(shù)資料
| 型號： | MAX8901B |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package |
| 中文描述： | 效率最高的2至6只串聯(lián)WLED供電電源，2mm x 2mm TDFN封裝 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 310K |
| 代理商： | MAX8901B |
M
Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
_______________________________________________________________________________________
9
The MAX8901_ features:
Internal soft-start that gradually illuminates the
WLEDs to eliminate inrush current during startup.
Input overvoltage protection (6.5V max) that
prevents IC switching when exceeded.
WLED overvoltage protection (25V typ) that latches
off the IC.
Shutdown mode that reduces current to 0.01μA (typ).
No WLED current is present in shutdown or during an
overvoltage condition if the WLED forward voltage is
greater than the input supply voltage. Figures 2 and 3
show the block diagrams for the MAX8901A and
MAX8901B, respectively.
Input Overvoltage Lockout
When V
IN
exceeds 6.2V (min), input overvoltage
lockout (OVLO) is engaged to protect the MAX8901_
from high-input voltage conditions. Once input OVLO
occurs, the MAX8901_ stops switching and no WLED
current flows, provided the forward voltage of the
WLED string is greater than V
IN
. When V
IN
falls below
6V (min), the input OVLO condition is cleared, and the
IC is enabled and enters soft-start.
WLED Overvoltage Protection
WLED overvoltage protection (OVP) occurs when the
WLED output voltage rises above the WLED OVP
threshold. The WLED OVP protection circuitry latches
off the IC and the IC enters shutdown when the WLED
OVP threshold is exceeded. After OVP is engaged,
cycle V
IN
or toggle ON to reenable the IC and enter
soft-start.
THERMAL
SHUTDOWN
BOOST
CONTROL
LOGIC
IC
POWER
REF
GND
INTERNAL
750kHz OSC
SHUTDOWN
TIMER
MAX8901B
IN
LX
PGND
0.5V
Gm
OVP
CS
COMP
ON
PULSE
DIMMING
EP
Figure 3. MAX8901B Block Diagram
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8901BETA+ | 制造商:Maxim Integrated Products 功能描述:HIGHEST EFFICIENCY SUPPLY FOR 2 TO 6 SERIES WLEDS IN A - Rail/Tube |
| MAX8901BETA+CAR | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX8901BETA+T | 功能描述:LED照明驅(qū)動器 Supply for 2 to 6 Series WLEDs RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX8901BETA+TCAR | 功能描述:LED照明驅(qū)動器 Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX8901BETA+TCH8 | 功能描述:LED照明驅(qū)動器 Supply for 2 to 6 Series WLEDs RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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