參數(shù)資料
型號(hào)： LT3956IUHE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PQCC36
封裝： 5 X 6 MM, LEAD FREE, PLASTIC, QFN-36
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 1424K
代理商： LT3956IUHE#TRPBF
LT3956
3956f
Typical applicaTion
FeaTures
applicaTions
DescripTion
80VIN, 80VOUT
Constant-Current,
Constant-Voltage Converter
The LT3956 is a DC/DC converter designed to operate as
a constant-current source and constant-voltage regulator.
It is ideally suited for driving high current LEDs. It features
an internal low side N-channel power MOSFET rated for
84V at 3.3A and driven from an internal regulated 7.15V
supply. The fixed frequency, current-mode architecture
results in stable operation over a wide range of supply
and output voltages. A ground referenced voltage FB pin
serves as the input for several LED protection features,
and also makes it possible for the converter to operate
as a constant-voltage source. A frequency adjust pin
allows the user to program the frequency from 100kHz
to 1MHz to optimize efficiency, performance or external
component size.
The LT3956 senses output current at the high side of the
LED string. High side current sensing is the most flexible
scheme for driving LEDs, allowing boost, buck mode or
buck-boost mode configuration. The PWM input provides
LED dimming ratios of up to 3000:1, and the CTRL input
provides additional analog dimming capability.
94% Efficient 25W White LED Headlamp Driver
n
3000:1 True Color PWMTM Dimming
n
Wide Input Voltage Range: 4.5V to 80V
n
Output Voltage Up to 80V
n
Internal 3.3A/84V Switch
n
Constant-Current and Constant-Voltage Regulation
n
250mV High Side Current Sense
n
Drives LEDs in Boost, Buck Mode, Buck-Boost Mode,
SEPIC or Flyback Topology
n
Adjustable Frequency: 100kHz to 1MHz
n
Open LED Protection
n
Programmable Undervoltage Lockout with Hysteresis
n
Constant-Voltage Loop Status Pin
n
PWM Disconnect Switch Driver
n
CTRL Pin Adjusts High Side Current Sense Threshold
n
Low Shutdown Current: <1A
n
Programmable Soft-Start
n
Available in the 36-Lead (5mm
× 6mm) QFN Package
n
High Power LED
n
Battery Charger
n
Accurate Current Limited Voltage Regulator
VIN
SW
LT3956
22H
D1
GND
VC
INTVCC
EN/UVLO
PGND
VREF
ISP
332k
100k
INTVCC
332k
2.2F
2
2.2F
5
4.7nF
VIN, 6V TO 60V
(80V TRANSIENT)
47nF
100k
34k
28.7k
375kHz
4.7F
40.2k
CTRL
16.2k
1M
0.68
370mA
M1
INTVCC
25W LED STRING
3956 TA01a
VMODE
PWM
SS
RT
ISN
FB
PWMOUT
Efficiency vs VIN
VIN (V)
0
20
80
EFFICIENCY
(%)
84
88
92
96
100
40
60
80
3956 TA01b
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 7199560 and 7321203.
相關(guān)PDF資料
PDF描述
LT3957EUHE#TRPBF SWITCHING REGULATOR, PQCC36
LT3957IUHE#PBF SWITCHING REGULATOR, PQCC36
LT3958IUHE#PBF SWITCHING REGULATOR, PQCC36
LT3958EUHE#PBF SWITCHING REGULATOR, PQCC36
LT3958EUHE#TRPBF SWITCHING REGULATOR, PQCC36
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT3957 制造商:LINER 制造商全稱:Linear Technology 功能描述:Wide Input Voltage Range
LT3957A 制造商:LINER 制造商全稱:Linear Technology 功能描述:Boost, Flyback, SEPIC and Inverting Converter
LT3957AEUHE#PBF 功能描述:IC REG MULTI CONFIG ADJ 5A 36QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2
LT3957AEUHE#TRPBF 功能描述:IC REG MULTI CONFIG ADJ 5A 36QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LT3957AIUHE#PBF 功能描述:IC REG MULTI CONFIG ADJ 5A 36QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2
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