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| 型号： | LT3482EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.28A 16QFN |
| 标准包装： | 121 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.24 V ~ 90 V |
| 输入电压： | 2.5 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 650kHz ~ 1.1MHz |
| 电流 - 输出： | 280mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3482
FU CTIO AL DIAGRA
V IN
L1
C FLY
11
V IN
7
SW
8
SW
6
PUMP
9 GND
D3
V OUT2
4
10 GND
D1
D2
V OUT1
5
C2
C1
R1
R2
FB
C PL
1.235V
REFERENCE
+
+
A1
DRIVER
MONIN
3
–
EAMP
R C
C C
A2
PWM
R S Q
Q1
APD
CURRENT
MIRROR
Σ
COMPARATOR
+
–
APD
2
C3
V IN
RAMP
GENERATOR
CURRENT
SENSE
AMPLIFIER
R S
12 SHDN
650kHz/1.1MHz
OSCILLATOR
NC 1
C S
13
CTRL
14
FB
15
f SET
16
MON
3482 BD
CONTROL
BLOCK
OPERATIO
R3
C4
The LT3842 boost converter uses a constant frequency
current mode control scheme to provide excellent line
and load regulation. Operation can be best understood by
referring to the Functional Diagram. 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 ampli?er A1, and is simply an ampli?ed version of the
difference between the feedback voltage and the reference
voltage of 1.235V, or externally provided CTRL voltage.
In this manner, the error ampli?er sets the correct peak
current level to keep the output in regulation. If the error
ampli?er’s output increases, more current is delivered to
the output; if it decreases, less current is delivered.
The LT3482 has an integrated high side APD current moni-
tor with a 5:1 ratio. The MONIN pin can accept a supply
voltage up to 90V, which is suitable for APD photodiode
applications. The MON pin has an open-circuit protection
feature and is internally clamped to 11.5V.
If an APD is tied to the APD pin, the current will be mir-
rored to the MON pin and converted to a voltage signal
by the resistor R3. This voltage signal can be used to
drive an external control block to adjust the APD voltage
by adjusting the feedback threshold of EAMP A1 through
the CTRL input.
3482fa
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3482EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:90V Boost DC/DC Converter with APD Current Monitor |
| LT3482IUD#PBF | 功能描述:IC REG BOOST ADJ 0.28A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LT3482IUD#TRPBF | 功能描述:IC REG BOOST ADJ 0.28A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3482IUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:90V Boost DC/DC Converter with APD Current Monitor |
| LT3482IUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:90V Boost DC/DC Converter with APD Current Monitor |
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