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参数资料
| 型号： | MAX17105ETG+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 21/26页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 24-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： | 500kHz ~ 2MHz |
| 电源电压： | 6 V ~ 28 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
8-String WLED Driver with Integrated Step-Up
Regulator and SMBus/PWM Dimming Capability
25.5mV O ( 0.75 - D )
I LIM = 2A +
0.5 O D O V S ?
V S
I OUT_CCM(MAX) = ? I LIM - ? O OE
(
)
L CCM(MIN) =
D =
V S(MIN)
L DCM(MAX) = ? 1- ?
V OUT(MAX) DIODE ? ?
?
2 O f SW(MAX) OUT(MAX) OUT(MAX)
O V
O I
2 O V OUT O ( V OUT DIODE S )
I OUT_DCM(MAX) =
Thermal Shutdown
The MAX17105 includes a thermal-protection circuit.
When the local IC temperature exceeds +150 N C (typ),
the controller and current sources shut down and do not
restart until the next enable signal is sent.
Design Procedure
All MAX17105 designs should be prototyped and tested
prior to production.
External component value choice is primarily dictated
by the output voltage and the maximum load current, as
well as maximum and minimum input voltages. Begin by
selecting an inductor value. Once the inductor is known,
choose the diode and capacitors.
Step-Up Converter Current Calculation
To ensure stable operation, the MAX17105 includes
slope compensation, which sets the minimum induc-
tor value. In continuous-conduction mode (CCM), the
minimum inductor value is calculated with the following
equation:
V OUT(MAX) + V DIODE - 2 O V S(MIN) O R S
2 O 25.5mV O f SW(MIN)
where 25.5mV is a scale factor from the slope com-
pensation, L CCM(MIN) is the minimum inductor value
for stable operation in CCM, and R S =13.7m I (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
V S(MIN) 2 OE
O
where L DCM(MAX) is the maximum inductor value for
DCM, E is the nominal regulator efficiency (85%), and
I OUT(MAX) is the maximum output current.
The output current capability of the step-up regulator is a
function of current limit, input voltage, operating frequency,
and inductor value. Because the slope compensation is
used to stabilize the feedback loop, the inductor current
limit depends on the duty cycle, and is determined with
the following equation:
R S
where 25.5mV is the scale factor from the slope compen-
sation, 2A is the current limit specified 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:
?
? f SW O L ? V OUT
where I LIM is the current limit calculated above, E is the
nominal regulator efficiency (85%), and D is the duty
cycle. The corresponding duty cycle for this current is:
V OUT -V S + V DIODE
V OUT -I LIM O 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 I
(typ)).
The maximum output current in DCM is governed by the
following equation:
L O I LIM 2 O f SW O E O ( V OUT + V DIODE )
+ V -V
Inductor Selection
The inductance, peak current rating, series resistance,
and physical size should all be considered when select-
ing an inductor. These factors affect the converter’s oper-
ating mode, efficiency, maximum output load capability,
transient-response time, output voltage ripple, and cost.
_______________________________________________________________________________________
21
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相关代理商/技术参数 |
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| MAX17105EVKIT+ | 功能描述:电源管理IC开发工具 MAX17105 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 |
| MAX17106ETN+ | 功能描述:PMIC 解决方案 PMIC for LCD RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX17106ETN+T | 功能描述:其他电源管理 Integrated Circuits (ICs) Power Management - Specialized - IC REG STEP UP/HV STEPUP 56-TQFN RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| MAX17106EVKIT+ | 制造商:Maxim Integrated Products 功能描述:STEP-UP REGULATOR HIGH-VOLTAGE STEP-UP WITH TEMPERATURE COMP - Boxed Product (Development Kits) |
| MAX17107ETI+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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