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参数资料
| 型号： | MAX8595XETA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 8-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 750kHz ~ 1.25MHz |
| 电源电压： | 2.6 V ~ 6 V |
| 输出电压： | 36V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
High-Efficiency, 36V Step-Up Converters
with T A Derating Option for 2 to 9 White LEDs
Design Procedure
Adjusting LED Current
Adjusting the output current of the MAX8595X/
MAX8596X changes the brightness of the LEDs. An
voltages near 5V, a larger value of inductance can be
more efficient. To prevent core saturation, ensure that
the inductor-saturation current rating exceeds the peak
inductor current for the application. Calculate the peak
inductor current with the following formula:
analog input (CTRL) and the sense-resistor value set
the output current. Output current is given by:
I LED = V CTRL / (5 x R SENSE )
I PEAK =
V OUT ( MAX ) × I LED ( MAX )
0 . 9 × V IN ( MIN )
+
V IN ( MIN ) × 0 . 9 μ s
2 × L
The V CTRL voltage range for adjusting output current is
0.24V to 1.65V (or 1.72V for the MAX8596X). To set the
maximum current, calculate R SENSE when V CTRL is at
its maximum as follows:
For the MAX8595X, R SENSE = 1.65 / (5 x I LED(MAX) )
For the MAX8596X, R SENSE = 1.72 / (5 x I LED(MAX) )
Power dissipation in R SENSE is typically less than 10mW,
allowing the use of a small surface-mount resistor.
PWM Dimming Control
CTRL is also used as a digital input allowing LED
brightness control with a logic-level PWM signal
applied directly to CTRL. The frequency range is from
200Hz to 200kHz, while 0% duty cycle corresponds to
zero current and 100% duty cycle corresponds to full
current. The error amplifier and compensation capaci-
tor form a lowpass filter so PWM dimming results in DC
current to the LEDs without the need for any additional
Schottky Diode Selection
The high switching frequency of the MAX8595X/
MAX8596X demands a high-speed rectification diode
(D1) for optimum efficiency. A Schottky diode is recom-
mended due to its fast recovery time and low forward-
voltage drop. Ensure that the diode ’s average and
peak current rating exceed the average output current
and peak inductor current. In addition, the diode ’s
reverse breakdown voltage must exceed V OUT . The
RMS diode current can be approximated from:
I DIODE ( RMS ) = I OUT × I PEAK
Applications Information
Compensation Information
The dominant pole (f DP ) of the error amplifier is given by:
RC filters; see the Typical Operating Characteristic s.
Capacitor Selection
Ceramic capacitors with X5R, X7R, or better dielectric
f DP =
1
4 M ? × C COMP
are recommended for stable operation over the entire
operating temperature range. The exact values of input
The output pole is given by
and output capacitors are not critical. The typical value
for the input capacitor is 2.2μF, and the typical value for
the output capacitor is 0.1μF. Higher value capacitors
f OUT =
1
2 π × R OUT × C OUT
can be used to reduce input and output ripple, but at
the expense of size and higher cost. C COMP stabilizes
the converter and controls soft-start. Connect a 0.1μF
capacitor from COMP to GND. For stable operation,
C OUT must not exceed 10 times C COMP .
where R OUT is the sum of R SENSE and the incremental
series resistance of the white LED string.
Continuous conduction introduces a right-half-plane
zero determined by
f RHPZ = ?
?×
Inductor Selection
Inductor values range from 10μH to 47μH. A 22μH
inductor optimizes the efficiency for most applications
while maintaining low 12mV P-P input ripple. With input
? V IN ?
? V OUT ?
R OUT
2 π × L
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8595YETA+ | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY 32V STEP-UP CONVER - Rail/Tube |
| MAX8595YETA+T | 功能描述:LED照明驱动器 36V Step-Up Converter 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 |
| MAX8595ZETA | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY 32V STEP-UP CONVER - Rail/Tube |
| MAX8595ZETA+ | 制造商:Maxim Integrated Products 功能描述:LED DRVR 8SEGMENT 3.3V/5V 8TDFN EP - Rail/Tube |
| MAX8595ZETA+T | 功能描述:LED照明驱动器 36V Step-Up Converter 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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