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參數(shù)資料
| 型號： | LT3465AES6 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.2MHz/2.4MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT |
| 中文描述： | 0.34 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 375K |
| 代理商： | LT3465AES6 |
LT3465/LT3465A
8
3465af
APPLICATIOU
W
U
U
Figure 8. Recommended Component Placement
Dimming Using Direct PWM (LT3465A)
Unlike the LT3465, the LT3465A does not have internal
soft-start. Although the input current is higher during start-
up, the absence of soft-start allows the CTRL pin to be
directly driven with a PWM signal for dimming. A zero
percent duty cycle sets the LED current to zero, while 100%
duty cycle sets it to full current. Average LED current
increases proportionally with the duty cycle of the PWM
signal. PWM frequency should be between 1kHz and 10kHz
for best performance. The PWM signal should be at least
1.8V in magnitude; lower voltage will lower the feedback
voltage as shown in Equation 1. Waveforms are shown for
a 1kHz PWM and 10kHz PWM signal in Figures 7a and 7b
respectively.
1
C
OUT
L
R
FB
2
3
6
5
4
C
IN
GND
3465A F08
V
IN
CTRL
minimize the input current. V
OUT
and input current during
output open circuit are shown in the Typical Performance
Characteristics.
Board Layout Consideration
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
To maximize efficiency, switch rise and fall times are made
as short as possible. To prevent electromagnetic interfer-
ence (EMI) problems, proper layout of the high frequency
switching path is essential. Place C
OUT
next to the V
OUT
pin. Always use a ground plane under the switching
regulator to minimize interplane coupling. In addition, the
ground connection for the feedback resistor R1 should be
tied directly to the GND pin and not shared with any other
component, ensuring a clean, noise-free connection. Rec-
ommended component placement is shown in Figure 8.
Figure 7a.
Figure 7b.
FB
100mV/DIV
CTRL
2V/DIV
200
μ
s/DIV (1kHz)
3465A F07a
FB
100mV/DIV
CTRL
2V/DIV
20
μ
s/DIV (10kHz)
3465A F07b
LT3465A
CTRL
PWM
Start-Up Input Current (LT3465A)
As previously mentioned, the LT3465A does not have an
internal soft-start circuit. Inrush current can therefore rise
to approximately 400mA as shown in Figure 9 when
driving 4 LEDs. The LT3465 has an internal soft-start
circuit and is recommended if inrush current must be
minimized.
Open-Circuit Protection
The LT3465 and LT3465A have an internal open-circuit
protection circuit. In the cases of output open circuit,
when the LEDs are disconnected from the circuit or the
LEDs fail, the V
OUT
is clamped at 30V. The LT3465 and
LT3465A will then switch at a very low frequency to
Figure 9.
FB
200mV/DIV
CTRL
2V/DIV
50
μ
s/DIV
3465A F09
I
IN
200mV/DIV
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3465AES6#PBF | 制造商:Linear Technology 功能描述:LED DRVR 6Segment 3.3V/5V/9V/12V/15V 6-Pin TSOT-23 制造商:Linear Technology 功能描述:LED DRIVER BOOST PWM/ANALOGUE 1.2MHZ 制造商:Linear Technology 功能描述:LED DRIVER, BOOST, PWM/ANALOGUE, 1.2MHZ, 制造商:Linear Technology 功能描述:SP-SWREG/LED Driver, CUT TAPE White LED Step-up Converter with Intl Schottky 制造商:Linear Technology 功能描述:LED DRIVER, BOOST, PWM/ANALOGUE, 1.2MHZ, TSOT-23-6, Topology:Boost (Step Up), No. of Outputs:1, Output Voltage:30V, Driver Case Style:TSOT-23, Input Voltage Min:2.7V, Input Voltage Max:16V, Dimming Control Type:PWM / Analogue , RoHS Compliant: Yes |
| LT3465AES6#TR | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-6 RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓撲:開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3465AES6#TRM | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-6 RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓撲:開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3465AES6#TRMPBF | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-6 RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:60 系列:- 恒定電流:- 恒定電壓:- 拓撲:線性（LDO），PWM，升壓（升壓） 輸出數(shù):8 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:RGB，白色 LED 頻率:500kHz ~ 1.5MHz 電源電壓:4.75 V ~ 26 V 輸出電壓:45V 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* 工作溫度:-40°C ~ 85°C |
| LT3465AES6#TRPBF | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-6 RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓撲:開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
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