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| 型号： | MAX17061ETI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 20/26页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 4.5 V ~ 26 V |
| 输出电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
8-String White LED Driver with
SMBus for LCD Panel Applications
( V OUT ( MAX ) + V DIODE IN ( MIN ) ) × R S
2 × 24 . 7 mV × f OSC ( MIN )
D =
L × I LIM OSC × η
× f
2 × ( V OUT + V DIODE ? V IN )
LDCM ( MAX ) = ? 1 ? ?
V IN ( MIN ) 2 × η
2 × f OSC ( MAX ) × V OUT ( MAX ) × I OUT ( MAX )
24 . 7 mV × ( 0 . 75 ? D )
To ensure the stable operation, the MAX17061 includes
slope compensation, which sets the minimum inductor
value. In continuous-conduction mode (CCM), the mini-
mum inductor value is calculated with the following
equation:
? 2 × V
L CCM ( MIN ) =
where 24.7mV is a scale factor from the slope compen-
sation, the L CCM(MIN) is the minimum inductor value for
stable operation in CCM, and R S =12m Ω (typ) is the
equivalent sensing scale factor from the controller’s
internal current-sense circuit.
The controller can also operate in discontinuous con-
duction mode (DCM). In this mode, the inductor value
can be lower, but the peak inductor current is higher
than in CCM. In DCM, the maximum inductor value is
calculated with the following equation:
? V IN ( MIN ) ?
? V OUT ( MAX ) + V DIODE ?
×
where the L DCM(MAX) is the maximum inductor value
for DCM, η is the nominal regulator efficiency (85%),
and I OUT(MAX) is the maximum output current.
The output current capability of the step-up converter is
a function of current limit, input voltage, operating fre-
quency, and inductor value. Because the slope com-
pensation is used to stabilize the feedback loop, the
inductor current limit depends on the duty cycle, and is
determined with the following equation:
I LIM = 1 . 9 A +
R S
where 24.7mV is the scale factor from the slope com-
pensation, 1.9A is a typical current limit at 75% duty
cycle, and D is the duty cycle.
The output current capability depends on the current-
limit value and operating mode. The maximum output
current in CCM is governed by the following equation:
where I LIM is the current limit calculated above, η is the
nominal regulator efficiency (85%), and D is the duty
cycle. The corresponding duty cycle for this current is:
V OUT ? V IN + V DIODE
V OUT ? I LIM × R ON + V DIODE
where V DIODE is the forward voltage of the rectifier
diode and R ON is the internal MOSFET’s on-resistance
(0.15 Ω typ).
The maximum output current in DCM is governed by
the following equation:
2
I OUT _ DCM ( MAX ) =
Inductor Selection
The inductance, peak current rating, series resistance,
and physical size should all be considered when selecting
an inductor. These factors affect the converter’s operating
mode, efficiency, maximum output load capability, tran-
sient response time, output voltage ripple, and cost.
The maximum output current, input voltage, output volt-
age, and switching frequency determine the inductor
value. Very high inductance minimizes the current rip-
ple, and therefore reduces the peak current, which
decreases core losses in the inductor and I 2 R losses in
the entire power path. However, large inductor values
also require more energy storage and more turns of
wire, which increases physical size and I 2 R copper
losses. Low inductor values decrease the physical size,
but increase the current ripple and peak current.
Finding the best inductor involves the compromises
among circuit efficiency, inductor size, and cost.
In choosing an inductor, the first step is to determine
the operating mode: continuous conduction mode
(CCM) or discontinuous conduction mode (DCM). The
MAX17061 has a fixed internal slope compensation that
requires minimum inductor value. When CCM mode is
chosen, the ripple current and the peak current of the
inductor can be minimized. If a small-size inductor is
required, DCM mode can be chosen. In DCM mode,
the inductor value and size can be minimized, but the
inductor ripple current and peak current are higher
than those in CCM. The controller can be stable, inde-
pendent of the internal slope compensation mode, but
I OUT _ CCM ( MAX ) = ? I LIM ?
?
?
0.5 × D × V IN ?
f OSC × L ? ?
there is a maximum inductor value requirement to
ensure the DCM operating mode.
20
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相关代理商/技术参数 |
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| MAX17061EVCMAXQU+ | 功能描述:LED 照明开发工具 Evaluation Kit/Evaluation System for the MAX17061 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: |
| MAX17061EVKIT+ | 功能描述:LED 照明开发工具 MAX17061 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: |
| MAX17062ETB+ | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:TFT-LCD STEP-UP DC-DC CONVERTER - Rail/Tube |
| MAX17062ETB+T | 功能描述:直流/直流开关转换器 TFT-LCD Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX17062EVKIT | 功能描述:电源管理IC开发工具 MAX17062 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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