High-Power Synchronous HBLED
Drivers with Rapid Current Pulsing
V CC
V LED
V CC
R4
R10
R8
C3
ON/OFF
V IN
7V TO 28V
Q5
R3
PWM DIM
R9
C2
Q4
14
13
12
11
10
9
8
L1
C11
I.C.
OUTV
RT/SYNC
EN
MODE
CLKOUT
SGND
D1
V LED
15 OVI
N.C. 7
C10
R7
16 CLP
DH 6
Q1
LED
R6
STRING
C9
17 EAOUT
LX 5
C1
PWM DIM
Q3
C8
18 EAN
MAX16821A
MAX16821B
BST 4
PWM DIM
Q2
R5
MAX16821C
19 DIFF
20 CSN
21 CSP
DL 3
N.C. 2
PGND 1
R1
R2
SGND
22
SENSE-
23
SENSE+
24
SGND
25
IN
26
V CC
27
V DD
28
V IN
Figure 11. Boost LED Driver with PWM Dimming
C7
C6
C5
Power Dissipation
Calculate power dissipation in the MAX16821A/
MAX16821B/MAX16821C as a product of the input volt-
age and the total V CC regulator output current (I CC ).
I CC includes quiescent current (I Q ) and gate-drive cur-
rent (I DD ):
P D = V IN x I CC
I CC = I Q + [f SW x (Q G1 + Q G2 )]
where Q G1 and Q G2 are the total gate charge of the
low-side and high-side external MOSFETs at V GATE =
5V, I Q is the supply current, and f SW is the switching
frequency of the LED driver.
Use the following equation to calculate the maximum
power dissipation (P DMAX ) in the chip at a given ambi-
ent temperature (T A ):
P DMAX = 34.5 x (150 – T A ) mW
______________________________________________________________________________________
21
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相关代理商/技术参数
MAX16821EVKIT+ 制造商:Maxim Integrated Products 功能描述:HIGH-POWER SYNCHRONOUS HBLED DRIVER - Boxed Product (Development Kits)
MAX16822AASA/V+ 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822AASA/V+T 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822AASA+ 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822AASA+T 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822BASA+ 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822BASA+T 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822BEVKIT+ 功能描述:LED 照明开发工具 MAX16822B 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: