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| 型号： | MAX8607ETD+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR PHOTO FLASH 14-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | 线性（LDO），PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 频率： | 800kHz ~ 1.2MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 5.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
1MHz PWM Boost Converter for 1.5A
White LED Camera Flash
Mode-Select Inputs (EN1, EN2)
Drive EN1 high and EN2 low to enable movie mode. In
Table 1. EN1 and EN2 Mode Selection
this mode, the current regulator regulates the current
through the LED to 1200 times the current set by the
MOV resistor. See the Setting the Movie-Mode Current
section for details on setting the movie-mode current.
Drive EN1 and EN2 high to enable flash mode. In this
mode, the current through the LED is regulated to 5000
EN1
0
0
1
1
EN2
0
1
0
1
Shutdown
Disco Mode
Movie Mode
Flash Mode
MODE
times the current set by the FLSH resistor. See the
Setting the Flash-Mode Current section for details on set-
ting the flash-mode current. The time duration of the flash
mode must be set using external circuitry or software.
Drive EN1 low and EN2 high to enable disco mode. In
this mode, the output of the boost converter provides a
regulated +5V at up to 1A for external circuitry, while
the LED current is regulated to 80mA. The LED current
is not adjustable in this mode.
Drive EN1 and EN2 low to place the IC into a low-
power shutdown mode. See the Shutdown section for
more details.
Overvoltage Protection
The output voltage of the MAX8607 is limited by internal
overvoltage-protection (OVP) circuitry, which prevents
the output from exceeding 5.7V under any conditions.
In flash and movie modes, if the output voltage nears
5.5V, the LED current is smoothly reduced through pro-
prietary means to prevent overvoltage without sudden
termination of the output current. In case of an LED with
very high forward voltage (V F ), this circuit provides
more reliable and repeatable flash than would a simple
on/off comparator. In disco mode, the output is limited
by the internal 5.0V regulation.
Undervoltage Lockout
The MAX8607 contains undervoltage-lockout (UVLO)
circuitry that disables the IC until V OUTS is greater than
2.38V. Prior to startup, V OUTS is one diode drop below
the input voltage. This ensures a great enough input
voltage for startup.
Soft-Start
The MAX8607 attains soft-start by charging C COMP
with a 100μA current source. During this time, the inter-
nal MOSFET is switching at the minimum duty cycle.
Once V COMP rises above 1V, the duty cycle increases
until output reaches the desired regulation level. COMP
is pulled to GND with a 140 ? internal resistor during
UVLO, OVP, or shutdown. See the Typical Operating
Characteristics for an example of soft-start operation.
Shutdown
Drive EN1 and EN2 low to place the MAX8607 into a
low-power shutdown mode. In shutdown, supply cur-
rent is reduced to 0.1μA (typ). C COMP is discharged
during shutdown, allowing the device to reinitiate soft-
start when it is enabled. The internal MOSFET and syn-
chronous rectifier are turned off during shutdown;
however, OUT is one body-diode drop below the input.
LED is high impedance so the external LED is off, but
any external circuitry on OUT is not disconnected and,
therefore, should include its own shutdown capability.
Typical shutdown timing characteristics are shown in
the Typical Operating Characteristi cs.
Ambient Temperature Derating Function
The MAX8607 limits the maximum LED current depend-
ing on its die temperature. Once the die temperature
reaches +40°C, the LED current decreases by 1.67%
per °C. This corresponds to approximately 0mA of LED
current at +100°C. Due to the package’s exposed pad-
dle, the die temperature is very close to the PC board
temperature. The temperature derating function allows
the LED current to be safely set higher at normal oper-
ating temperatures, thereby allowing either a brighter
flash or movie light to be used for normal ambient tem-
peratures. See the Typical Operating Characteristics
for a graph of LED Current vs. Ambient Temperature.
Applications Information
Setting the Movie-Mode Current
To set the LED current during movie mode, connect a
resistor from MOV to GND (R MOV ). V MOV is regulated
to 0.6V and the current through R MOV is mirrored to
LED with a gain of 1200. R MOV is calculated as:
R MOV = (0.6V x 1200) / I LED(MOV)
Setting the Flash-Mode Current
To set the LED current during flash mode, connect a
resistor from FLSH to GND (R FLSH ). V FLSH is regulated
to 0.6V and the current through R FLSH is mirrored to
LED with a gain of 5000. R FLSH is calculated as:
R FLSH = (0.6V x 5000) / I LED(FLSH)
_______________________________________________________________________________________
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相关代理商/技术参数 |
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| MAX8607EVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX8607 EVAL KIT - Boxed Product (Development Kits) |
| MAX8608YETD+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8608YETD+T | 功能描述:LED照明驱动器 26V 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 |
| MAX8608YETD-T | 功能描述:LED照明驱动器 26V 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 |
| MAX8608YEVKIT | 功能描述:LED 照明开发工具 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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