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| 型号： | MAX16831EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX16831 |
| 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： | 1A |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 28V |
| 特点： | 可调光 |
| 输入电压： | 9 ~ 40 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX16831 |
MAX16831
High-Voltage, High-Power LED Driver with
Analog and PWM Dimming Control
Reference Voltage Output
The MAX16831 includes a 5% accurate 3V (typ)
buffered reference output, REF. REF is a push-pull out-
REF
put capable of sourcing/sinking 100μA of current and
can drive a maximum load capacitance of 100pF.
Connect REF to DIM through a resistive voltage-divider
to supply an analog signal for dimming. See the
Dimming Input (DIM) section.
Dimming MOSFET Driver (DDR)
The MAX16831 requires an external n-channel
MOSFET for PWM dimming. Connect the MOSFET to
R 3
R 4
DIM
MAX16831
AGND
the output of the DDR dimming driver, DGT, for normal
operation. V DGT swings between V LO and V CLMP . The
DDR dimming driver is capable of sinking or sourcing
up to 20mA of current. The average current required to
drive the dimming MOSFET (I DRIVE_DIM ) depends on
the MOSFET’s total gate charge (Q G_DIM ) and the dim-
ming frequency of the converter, f DIM . Use the follow-
ing equation to calculate the average gate drive current
for the n-channel dimming FET.
I DRIVE_DIM = Q G_DIM x f DIM
n-Channel MOSFET Switch Driver (DRV)
The MAX16831 drives an external n-channel MOSFET.
Use an external supply or connect REG2 to DRI to
power the MOSFET driver. The driver output, V DRV ,
swings between ground and V DRI . Ensure that V DRI
remains below the absolute maximum V GS rating of the
external MOSFET. DRV is capable of sinking 2.5A or
sourcing 1.4A of peak current, allowing the MAX16831
to switch MOSFETs in high-power applications. The
average current sourced to drive the external MOSFET
depends on the total gate charge (Q G ) and operating
frequency of the converter, f SW . The power dissipation
in the MAX16831 is a function of the average output
drive current (I DRIVE ). Use the following equations to
calculate the power dissipation in the gate driver sec-
tion of the MAX16831 due to I DRIVE :
I DRIVE = Q G x f SW
P D = (I DRIVE + I CC ) x V DRI
where V DRI is the supply voltage to the gate driver and
I CC is the operating supply current. I DRIVE should not
exceed 20mA.
Dimming Input (DIM)
Figure 2. Creating a DIM Input Signal from REF
control signal is applied to DIM, the MAX16831 com-
pares the DC input to an internally generated 200Hz
ramp to pulse-width-modulate the LED current (f DIM =
200Hz). The output current duty cycle is linearly
adjustable from 0 to 100% (0.2V < V DIM < 2.8V).
Use the following formula to calculate the voltage, V DIM ,
necessary for a given output-current duty cycle, D:
V DIM = (D x 2.6) + 0.2V
where V DIM is the voltage applied to DIM in volts.
Connect DIM to REF through a resistive voltage-divider
to apply a DC DIM control signal (Figure 2). Use the
required dimming input voltage, V DIM , calculated
above and select appropriate resistor values using the
following equation:
R 4 = R 3 x V DIM / (V REF - V DIM )
where V REF is the 3V reference output voltage and
30k ? ≤ R 3 + R 4 ≤ 150k ? .
For proper operation at startup or after toggling ENABLE,
the controller needs three clock edges or an analog volt-
age greater than 0.3V on the DIM input.
Oscillator, Clock, and Synchronization
The MAX16831 is capable of stand-alone operation or
synchronizing to an external clock, and driving external
devices in SYNC mode. For stand-alone operation, pro-
gram the switching frequency by connecting a single
external resistor, R T , between RTSYNC and ground.
Select the switching frequency, f SW , from 125kHz to
600kHz and calculate R T using the following formula:
The dimming input, DIM, functions with either analog or
PWM control signals. Once the internal pulse detector
detects three successive edges of a PWM signal with a
R T =
500kHz
f SW
× 25 k ?
frequency between 80Hz and 2kHz, the MAX16831 syn-
chronizes to the external signal and pulse-width-modu-
lates the LED current at the external DIM input frequency
with the same duty cycle as the DIM input. If an analog
Maxim Integrated
where the switching frequency is in kHz and RT is in k ? .
The MAX16831 is also capable of synchronizing to an
external clock signal ranging from 125kHz to 600kHz.
11
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| MAX16831EVKIT+ | 功能描述:LED 照明开发工具 MAX16831 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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| MAX16832AASA+ | 功能描述:LED照明驱动器 Ic Led Drvr High Bright 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 |
| MAX16832AASA+T | 功能描述:LED照明驱动器 Ic Led Drvr High Bright 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 |
| MAX16832CASA+ | 功能描述:LED照明驱动器 Ic Led Drvr High Bright 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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