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參數(shù)資料
| 型號： | MAX8901A |
| 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)： | 7/15頁 |
| 文件大?。?/td> | 310K |
| 代理商： | MAX8901A |
M
Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
_______________________________________________________________________________________
7
Pin Description
PIN
NAME
FUNCTION
1
OVP
WLED Overvoltage Protection Input. OVP monitors voltage at the WLEDs. Connect OVP to the
positive terminal of the output capacitor. If an OVP condition is detected, the MAX8901_ latches off.
Cycle V
IN
or toggle V
ON
to restart the IC.
2
ON
Enable and Dimming Control Input. Drive ON high to enable the IC. Drive ON low for greater than
1.33ms (typ) to shutdown the WLED current regulator.
For the MAX8901A:
After V
IN
is above V
UVLO
and ON is driven high, the MAX8901A enters soft-start
and increases the WLED current to full brightness. Apply a minimum 30kHz (500kHz max) PWM
signal to ON to adjust the WLED brightness from 100% to off, proportional to the duty cycle of the
PWM signal. See the
PWM Dimming Control (MAX8901A)
section
for more details
.
For the MAX8901B:
After ON is driven high for 40μs (min), the MAX8901B enters soft-start and
increases the WLED current to full brightness. Subsequent pulses on ON cause the MAX8901B
WLED current to decrease in 32 equal steps. See the
Serial-Pulse Dimming Control (MAX8901B)
section
for more details
.
Power Supply Input. Bypass IN to GND with a 1μF ceramic capacitor placed as close as possible to
the IC. If V
IN
exceeds the input overvoltage lockout threshold (6.5V max, V
IN
rising), the IC stops
switching and no WLED current flows (if the forward voltage of the WLED string is greater than V
IN
).
When V
IN
falls below the overvoltage lockout hysteresis level (6.0V min, V
IN
falling), soft-start is
initiated and normal operation resumes
.
Boost Inductor Node. Connect an inductor between IN and LX. LX is high impedance in shutdown.
Power Ground. Connect to GND and the exposed paddle (EP) with a short, wide trace.
Analog Ground. Connect GND to the exposed paddle with a short, wide trace.
WLED Boost Compensation Node. Connect a 0.022μF ceramic capacitor from COMP to GND.
C
COMP
stabilizes the converter and sets the soft-start time. COMP discharges to GND when in
shutdown.
WLED Current Sense Input. For the MAX8901A, connect a current-sense resistor from CS to GND.
Voltage sensed at CS regulates the WLED current. For the MAX8901B, do not connect a sense
resistor from CS to GND. The MAX8901B provides an internal current source from CS to GND to
program the WLED current. The MAX8901B regulates V
CS
to 0.5V (typ) for all I
LED.
The MAX8901A
regulates V
CS
to 0.5V (typ) for maximum duty cycle only.
Exposed Metal Paddle. Connect EP to GND. For good thermal dissipation, the exposed paddle must
be connected to a large ground plane.
3
IN
4
5
6
LX
PGND
GND
7
COMP
8
CS
—
EP
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PDF描述 |
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| MAX8901AETA | Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package |
| MAX8901B | Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package |
| MAX8901BETA | Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8901AETA+ | 制造商:Maxim Integrated Products 功能描述:HIGHEST EFFICIENCY SUPPLY 8TDFN EP - Rail/Tube |
| MAX8901AETA+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+ | 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 |
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