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| 型号： | MAX16834EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/23页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX16834 |
| 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： | 7 ~ 28V |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX16834 |
MAX16834
High-Power LED Driver with Integrated High-Side LED
Current Sense and PWM Dimming MOSFET Driver
configuration, the input current is the inductor current
minus the LED current. But for both configurations, the
ripple current that the input filter capacitor has to sup-
ply is the same as the inductor ripple current with the
condition that the output filter capacitor should be con-
nected to ground for boost-buck configuration. This
source and discharged at the beginning of each switch-
ing cycle to generate the slope compensation ramp.
The value of the slope compensation capacitor C2 is
calculated as shown below:
Boost configuration:
reduces the size of the input capacitor, as the inductor
current is continuous with maximum ±30% ripple.
Neglecting the effect of LED current ripple, the calcula-
tion of the input capacitor for boost as well as boost-
C2 =
3 × L × 100 × 10 - 6
(V LED -V INMIN ) × R8 × 2
C IN ≥
3 × L × 100 × 10 - 6
(V LED ) × R8 × 2
buck configurations is the same.
Neglecting the effect of the ESL, the ESR, and the bulk
capacitance at the input contributes to the input voltage
ripple. For simplicity, assume that the contribution from
the ESR and the bulk capacitance is equal. This allows
50% of the ripple for the bulk capacitance. The capaci-
tance is given by:
? I L
4 × ? V IN × f SW
where ? I L is in amperes, C IN is in farads, f SW is in hertz,
and ? V IN is in volts. The remaining 50% of allowable
ripple is for the ESR of the output capacitor. Based on
this, the ESR of the input capacitor is given by:
where C2 is in farads, L is the inductance of the induc-
tor L1 in henries, 100μA is the pullup current from SC,
V LED and V INMIN are in volts, and R8 is the switch cur-
rent-sense resistor in ohms.
Boost-buck configuration:
C2 =
where C2 is in farads, L is the inductance of the induc-
tor L1 in henries, 100μA is the pullup current from SC,
V LED is in volts, and R8 is the switch current-sense
resistor in ohms.
Selection of Power Semiconductors
Switching MOSFET
ESR CIN <
? V IN
? I L × 2
The switching MOSFET (Q1) should have a voltage rat-
ing sufficient to withstand the maximum output voltage
together with the diode drop of the rectifier diode D1
where ? I L is in amperes, ESR CIN is in ohms, and ? V IN
is in volts.
Use the below equation to calculate the RMS current
rating of the input capacitor:
and any possible overshoot due to ringing caused by
parasitic inductances and capacitances. Use a
MOSFET with a drain-to-source voltage rating higher
than that calculated by the following equations:
Boost configuration:
I CIN(RMS) =
? I L
2 3
V DS = ( V LED + V D ) × 1 . 2
Slope Compensation
Slope compensation should be added to converters
with peak current-mode control operating in continuous
conduction mode with more than 50% duty cycle to
avoid current loop instability and subharmonic oscilla-
tions. The minimum amount of slope added to the peak
inductor current to stabilize the current control loop is
half of the falling slope of the inductor.
In the MAX16834, the slope compensating ramp is
added to the current-sense signal before it is fed to the
PWM comparator. Connect a capacitor (C2 in the appli-
cation circuit) from SC to ground for slope compensa-
tion. This capacitor is charged with a 100μA current
14
where V DS is the drain-to-source voltage in volts and
V D is the forward drop of the rectifier diode D1. The fac-
tor of 1.2 provides a 20% safety margin.
Boost-buck configuration:
V DS = ( V LED + V INMAX + V D ) × 1 . 2
where V DS is the drain-to-source voltage in volts and
V D is the forward drop of the rectifier diode D1. The fac-
tor of 1.2 provides a 20% safety margin.
The continuous drain current rating of the selected
MOSFET, when the case temperature is at +70°C,
should be greater than the value calculated by the fol-
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16834EVKIT+ | 功能描述:LED 照明开发工具 MAX16834 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: |
| MAX16835ATE/V+ | 制造商:Maxim Integrated Products 功能描述:HIGH-VOLTAGE, 350MA, ADJUSTABLE LINEAR HIGH-BRIGHTNESS LED D - Rail/Tube |
| MAX16835ATE/V+T | 制造商:Maxim Integrated Products 功能描述:HIGH-VOLTAGE, 350MA, ADJUSTABLE LINEAR HIGH-BRIGHTNESS LED D - Tape and Reel |
| MAX16835ATE+ | 功能描述:LED照明驱动器 350mA Adj Linear HB 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 |
| MAX16835ATE+T | 功能描述:LED照明驱动器 350mA Adj Linear HB 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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