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參數(shù)資料
| 型號： | MAX1912EUB |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5x/2x High-Efficiency White LED Charge Pumps |
| 中文描述： | 0.12 A SWITCHED CAPACITOR REGULATOR, 875 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | MO-187CBA, MICRO, SOP-10 |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 788K |
| 代理商： | MAX1912EUB |
M
1.5x/2x High-Efficiency White LED
Charge Pumps
6
_______________________________________________________________________________________
Applications Information
Adjusting LED Intensity
Figure 8 shows a circuit using a DAC to set the LED
intensity. Maximum intensity occurs when the output of
the DAC is zero. R
L
can be initially estimated from the
maximum load current:
R
L
≈
0.2/I
L(MAX)
Use this as a starting point to calculate R
A
and R
B
from
the formula below. The total LED current, I
L
, at different
DAC output voltages is determined by:
Figure 9 uses a digital input for two-level dimming control.
The LEDs are brightest when a logic-low input (V
LOGIC
=
0) is applied, and dimmed with a logic-high input.
The total LED current is determined by:
PC Board Layout
The MAX1910/MAX1912 are high-frequency switched-
capacitor voltage regulators. For best circuit perfor-
mance, use a ground plane and keep C
IN
, C
OUT
, C1,
C2, and feedback resistors (if used) close to the
device. If using external feedback, keep the feedback
node as small as possible by positioning the feedback
resistors very close to SET.
Chip Information
TRANSISTOR COUNT: 2497
PROCESS: BiCMOS
I
R
V
R
R
R
L
L
LOGIC
B
L
A
=
×
×
0 2
.
0. )
(
-
-
I
R
V
R
R
R
L
L
DAC
B
L
A
=
×
×
0 2
.
0. )
(
-
-
IN
GND
SW1
SW7
(REGULATING
SWITCH)
SW6
SW5
SW4
SW2
SW3
OUT
C1-
C1+
C2-
C2+
MODE
1.5x
1.5x
2x
2x
PHASE
Charging
Transfer
Charging
Transfer
SW1
OFF
ON
OFF
ON
SW2
ON
OFF
OFF
OFF
SW3
OFF
ON
ON
ON
SW4
OFF
ON
ON
ON
SW5
ON
OFF
ON
OFF
SW6
OFF
ON
OFF
ON
SW7
ON
OFF
ON
OFF
Figure 1. Functional Charge-Pump Switch Diagram (Switches Shown for 1.5x Charging Phase)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1912EUB+ | 功能描述:LED照明驅(qū)動器 1.5x/2x White LED 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 |
| MAX1912EUB+T | 功能描述:LED照明驅(qū)動器 1.5x/2x White LED 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 |
| MAX1912EUB-T | 功能描述:LED照明驅(qū)動器 1.5x/2x White LED 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 |
| MAX1916EZT | 制造商:Maxim Integrated Products 功能描述:LOW-DROPOUT CONSTANT-CURRENT TRIPLE WHITE LED BIAS SUPPLY - Rail/Tube |
| MAX1916EZT+ | 制造商:Maxim Integrated Products 功能描述:CONSTANT-CURRENT TRIPLE WHITE LED BIAS 制造商:Maxim Integrated Products 功能描述:LED DRVR 3SEGMENT 2.5V TO 5.5V 6PIN SOT-23 - Rail/Tube |
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