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参数资料
| 型号： | MAX16821BATI+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR HIGH BRIGHT 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 拓扑： | 高端，低端，PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 125kHz ~ 1.5MHz |
| 电源电压： | 4.75 V ~ 5.5 V，7 V ~ 28 V |
| 输出电压： | 5.1V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
High-Power Synchronous HBLED
Drivers with Rapid Current Pulsing
Current-Error Amplifier
The MAX16821A/MAX16821B/MAX16821C include a
transconductance current-error amplifier with a typical
g m of 550μS and 320μA output sink and source capa-
bility. The current-error amplifier output (CLP) is con-
nected to the inverting input of the PWM comparator.
CLP is also externally accessible to provide frequency
compensation for the inner current regulation loop
(Figure 2). Compensate CEA so the inductor current
negative slope, which becomes the positive slope to
the inverting input of the PWM comparator, is less than
the slope of the internally generated voltage ramp (see
the Compensation section). In applications without syn-
chronous rectification, the LED driver can be turned off
and on instantaneously by shorting or opening the CLP
to ground.
PWM Comparator and R-S Flip-Flop
An internal PWM comparator sets the duty cycle by
comparing the output of the current-error amplifier to a
2V P-P ramp signal. At the start of each clock cycle, an
R-S flip-flop resets and the high-side driver (DH) turns
on if MODE is connected to SGND, and DL turns on if
MODE is connected to V CC . The comparator sets the
flip-flop as soon as the ramp signal exceeds the CLP
voltage, thus terminating the ON cycle. See Figure 3.
Differential Amplifier
The differential amplifier (DIFF) allows LED current sens-
ing (Figure 2). It provides true-differential LED current
sensing, and amplifies the sense voltage by a factor of 1
(MAX16821A), 6 (MAX16821B), and 20 (MAX16821C),
while rejecting common-mode voltage errors. The VEA
provides the difference between the differential amplifier
output (DIFF) and the desired LED current-sense volt-
age. The differential amplifier has a bandwidth of 1.7MHz
(MAX16821A), 1.6MHz (MAX16821B), and 550kHz
(MAX16821C). The difference between SENSE+ and
SENSE- is regulated to +0.6V (MAX16821A), +0.1V
(MAX16821B), or +0.03V (MAX16821C).
60mV
PEAK-CURRENT
COMPARATOR
CLP
CSP
A V = 34.5
CSN
g m = 550 μ S
IN
PWM
COMPARATOR
MODE = GND
BST
RAMP
S
Q
DH
LX
V DD
CLK
R
Q
DL
PGND
SHDN
Figure 3. MAX16821A/MAX16821B/MAX16821C Phase Circuit
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16821BATI+ | 功能描述:LED照明驱动器 Synchronous HB w/Rapid Current Puls RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16821BATI+T | 功能描述:LED照明驱动器 Synchronous HB w/Rapid Current Puls RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16821BATI+TW | 功能描述:LED照明驱动器 High-Power Synchronous HBLED Drivers with Rapid Current Pulsing RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16821BATI+W | 功能描述:LED照明驱动器 High-Power Synchronous HB LED Drivers with Rapid Current Pulsing RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16821BEVKIT+ | 功能描述:LED 照明开发工具 MAX16821B Eval Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
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