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参数资料
| 型号： | MAX16821BEVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/5页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX16821B |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 660mA |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 28V |
| 特点： | 可调光 |
| 输入电压： | 7 ~ 24V |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX16821 |
MAX16821B Evaluation Kit
LED Output Current
The MAX16821B delivers 660mA into an LED string
rated up to a maximum of 28V. Resistor R7 sets the
MAX16821B EV kit LED output current. Use the follow-
ing equation to calculate R7 when reconfiguring the
LED+ exceeds the programmed 33V threshold, the
low-side driver turns off to prevent current through the
LED string connected between LED+ and LED-. Use
the following equation to calculate R1 and R2 resistor
values for a new overvoltage threshold:
LED current:
R 7 =
100mV
I LED
R 1 = R 2 ×
( V OV _ LIM ? V OV
V OV
)
where V OV_LIM is the desired overvoltage threshold, R2
where 100mV is the MAX16821B regulated SENSE+
to SENSE- differential current-sense voltage and I LED is
the desired LED current.
Input Current-Limit Setting
Current-sense resistor R6 sets the EV kit’s circuit aver-
age input current limit to 3.75A. During an overload
condition at low line, the MAX16821B regulates the
average input current to 3.75A. Use the following equa-
is typically 10k Ω , and V OV is 1.276V.
Switching Frequency
The MAX16821B EV kit switching frequency (f SW ) is
configured to 500kHz by resistor R4. To reconfigure the
MAX16821B switching frequency from 125kHz to
1.5MHz, use the equations below to calculate the new
value for R4:
R 6 =
tion to calculate a new R6 value when reconfiguring the
input current limit:
26.4 mV
I IN
R 4 =
R 4 =
6 . 4 x 10 10
f SW
6 . 25 x 10 10
f SW
, for 40 k Ω ≤ R 4 ≤ 120 k Ω
, for 120 k Ω ≤ R 4 ≤ 500 k Ω
where I IN is the input current limit.
For additional information, refer to the Average Current
Limit section in the MAX16821A/MAX16821B/MAX16821C
IC data sheet for setting the input current limit when
configuring the MAX16821B in a boost configuration.
LED Brightness Dimming
The LED brightness can be dimmed using a PWM sig-
nal with a 5V logic-high level and frequency range of
100Hz to 5kHz. Connect the PWM signal to the
PWMDIM and SGND PCB pads to control the LEDs’
brightness.
Output Overvoltage Protection
The maximum voltage on the LED+ pin is limited to 33V,
with respect to GND, by a resistor feedback network
formed by resistors R1 and R2. When the voltage at
where f SW is the desired switching frequency.
When reconfiguring the MAX16821B EV kit switching
frequency, other components may need to be changed
for proper stable operation.
Clock Output
The MAX16821B EV kit also features a clock output sig-
nal that is 180° out-of-phase with respect to MOSFET
N5. The clock output is available at the CLKOUT PCB
pad. Use the SGND PCB pad as a reference ground for
the CLKOUT signal.
Output Enable (EN)
The MAX16821B is enabled through pullup resistor R5.
To disable the MAX16821B EV kit, connect the EN PCB
pad to the SGND pad.
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相关PDF资料 |
PDF描述 |
|---|---|
| MAX16822BEVKIT+ | KIT EVAL FOR MAX16822 |
| MAX16823EVKIT+ | EVAL KIT FOR MAX16823 |
| MAX16824EVKIT+ | KIT EVAL FOR MAX16824 |
| MAX16825EVKIT+ | KIT EVAL FOR MAX16825 |
| MAX16828EVKIT+ | EVALUATION KIT FOR MAX16828 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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: |
| MAX16821CATI+ | 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 |
| MAX16821CATI+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 |
| 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 |
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