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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)： | 5/12頁 |
| 文件大小： | 375K |
| 代理商： | LT3465AES6 |
LT3465/LT3465A
5
3465af
BLOCK DIAGRA
–
+
+
–
+
R
Q
S
0.2
SW
DRIVER
COMPARATOR
2
CTRL
4
6
V
OUT
1
V
IN
5
3
FB
200mV
–
+
Σ
RAMP
GENERATOR
OVERVOLTAGE
PROTECT
R
C
10k
40k
C
C
1.2MHz*
OSCILLATOR
*2.4MHz FOR LT3465A
GND
3465A F02
Q1
A2
A1
V
1.25V
Figure 2. LT3465 Block Diagram
APPLICATIU
Operation
The LT3465 uses a constant frequency, current mode
control scheme to provide excellent line and load regula-
tion. Operation can be best understood by referring to the
block diagram in Figure 2. At the start of each oscillator
cycle, the SR latch is set, which turns on the power switch
Q1. A voltage proportional to the switch current is added
to a stabilizing ramp and the resulting sum is fed into the
positive terminal of the PWM comparator A2. When this
voltage exceeds the level at the negative input of A2, the
SR latch is reset turning off the power switch. The level at
the negative input of A2 is set by the error amplifier A1,
and is simply an amplified version of the difference
between the feedback voltage and the reference voltage of
200mV. In this manner, the error amplifier sets the
correct peak current level to keep the output in regulation.
If the error amplifier’s output increases, more current is
delivered to the output; if it decreases, less current is
delivered. The CTRL pin voltage is used to adjust the
reference voltage.
The block diagram for the LT3465A (not
shown) is identical except that the oscillator frequency is
2.4MHz.
W
U
U
Minimum Output Current
T
he LT3465
can drive a 3-LED string at 1.5mA LED
current without pulse skipping. As current is further
reduced, the device will begin skipping pulses. This will
result in some low frequency ripple, although the LED
current remains regulated on an average basis down to
zero. The photo in Figure 3a details circuit operation
driving three white LEDs at a 1.5mA load. Peak inductor
current is less than 40mA and the regulator operates in
discontinuous mode, meaning the inductor current
V
5V/DIV
I
L
20mA/DIV
V
10mV/DIV
V
IN
= 4.2V
I
= 1.5mA
3 LEDs
Figure 3a. Switching Waveforms (LT3465)
0.2
μ
s/DIV
3465A F03a
Figure 3b. Switching Waveforms (LT3465A)
V
5V/DIV
I
L
20mA/DIV
V
10mV/DIV
V
IN
= 4.2V
I
= 0.2mA
3 LEDs
0.1
μ
s/DIV
3465A F03b
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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(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?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(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?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(biāo)準(zhǔn)包裝:60 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?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(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?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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