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參數(shù)資料
| 型號： | LQH32CN150K53 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN |
| 中文描述： | 20mA的LED驅(qū)動器和3毫米的OLED驅(qū)動器集成肖特基x 2mm DFN封裝 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 449K |
| 代理商： | LQH32CN150K53 |
LT3498
9
3498f
LED CURRENT (mA)
0
65
70
80
15
60
55
5
10
20
50
45
75
E
3498 F02
15uH Murata LQH32CN150K53
15uH Murata LQH2MCN150K02
15uH Cooper SD3110-150
15uH Toko D312C
15uH Coilcraft DO3314-153ML
The low noise boost of the LT3498 uses a novel control
scheme to provide high efficiency over a wide range
of output current. In addition, this technique keeps the
switching frequency above the audio band over all load
conditions.
The operation of the part can be better understood by
referring to the Block Diagram. The part senses the
output voltage by monitoring the voltage on the FB2 pin.
The user sets the desired output voltage by choosing the
value of the external topside feedback resistor. The part
incorporates a precision 182k
Ω
bottom-side feedback
resistor. Assuming that output voltage adjustment is not
used (CTRL2 pin is tied to 1.5V, or greater), the internal
reference (V
REF
= 1.215V) sets the voltage to which FB2
will servo during regulation.
The Switch Control block senses the output of the ampli-
fier and adjusts the switching frequency, as well as other
parameters to achieve regulation. During the start-up of
the circuit, special precautions are taken to ensure that
the inductor current remains under control.
Because the switching frequency is never allowed to fall
below approximately 50kHz, a minimum load must be
present to prevent the output voltage from drifting too
high. This minimum load is automatically generated within
the part via the Shunt Control block. The level of this current
is adaptable, removing itself when not needed to improve
efficiency at higher load levels.
The low-noise boost of the LT3498 also has an integrated
Schottky diode and PMOS output disconnect switch. The
PMOS switch is turned on when the part is enabled. When
the part is in shutdown, the PMOS switch turns off, allowing
the V
OUT2
node to go to ground. This type of disconnect
function is often required in power supplies.
OPERATION—OLED DRIVER
APPLICATIONS INFORMATION—LED DRIVER
Inductor Selection
A 15μH inductor is recommended for most applications
for the LED driver of the LT3498. Although small size and
high efficiency are major concerns, the inductor should
have low core losses at 2.3MHz and low DCR (copper
wire resistance). Some small inductors in this category
are listed in Table 1. The efficiency comparison of different
inductors is shown in Figure 2.
Table 1: Recommended Inductors
MAX
DCR
(
Ω
)
LQH32CN150K53
LQH2MCN150K02
LQH32CN100K53
LQH2MCN100K02
10
1.2
SD3110-150
15
0.764
PART
L
(μH)
15
15
10
CURRENT
RATING
(mA)
300
200
450
225
380
VENDOR
Murata
www.murata.com
0.58
1.6
0.3
Cooper
www.cooperet.com
1001AS-150M
(TYPE D312C)
D03314-153ML
15
0.80
360
Toko
www.toko.com
Coilcraft
www.coilcraft.com
15
0.86
680
Figure 2. Efficiency Comparison of Different Inductors
Capacitor Selection
The small size of ceramic capacitors makes them ideal for
LT3498 LED driver applications. Use only X5R and X7R
types, because they retain their capacitance over wider
temperature ranges than other types, such as Y5V or
Z5U. A 4.7μF input capacitor and a 1μF output capacitor
are sufficient for most applications.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LQH32CN150K53K | 制造商:MURATA 制造商全稱:Murata Manufacturing Co., Ltd. 功能描述:Chip Inductor (Chip Coil) Power Inductor (Wire Wound Type for Choke) LQH32C_53 Series |
| LQH32CN150K53L | 功能描述:固定電感器 15uH 10% RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| LQH32CN1R0M01L | 功能描述:固定電感器 1210 1.0uH +/-20% RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| LQH32CN1R0M11L | 功能描述:固定電感器 1210 1.0uH +/-20% RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| LQH32CN1R0M23L | 功能描述:固定電感器 1uH 20% RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
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