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MAX16838
Integrated, 2-Channel, High-Brightness LED Driver
with High-Voltage Boost and SEPIC Controller
Pin Description
TQFN
1
PIN
TSSOP
4
NAME
NDRV
FUNCTION
Gate Drive for Switching MOSFET. Connect NDRV to GATE directly or through a resistor
to control the rise and fall times of the gate drive.
5V Regulator Output. MOSFET gate-driver supply input. Bypass DRV to PGND with a
2
5
DRV
minimum of 1 F F ceramic capacitor. Place the capacitor as close as possible to DRV
and PGND.
3
4
5
6
6
7
8
9
V CC
IN
EN
SGND
Internal Circuitry Supply Voltage. Bypass V CC to SGND with a minimum of 0.1 F F
ceramic capacitor. Place the capacitor as close as possible to V CC and SGND.
Supply Input. Connect a 4.75V to 40V supply to IN. Bypass IN to PGND with a minimum
of 1 F F ceramic capacitor. For a 5V Q 10% supply voltage, connect V IN to V CC .
Enable/Undervoltage Lockout (UVLO) Threshold Input. EN is a dual-function input.
Connect EN to V IN through a resistor-divider to program the UVLO threshold.
Signal Ground. SGND is the current return path connection for the low-noise analog
signals. Connect SGND, LEDGND, and PGND at a single point.
Current Foldback Reference Input. Connect a resistor-divider between IN, CFB, and
7
10
CFB
ground to set the current foldback threshold. When the voltage at CFB goes below
1.23V, the LED current starts reducing linearly. Connect to V CC to disable the current
foldback feature.
8
9
10
11
12
13
OV
ISET
FLT
Overvoltage Threshold Adjust Input. Connect a resistor-divider from the switching
converter output to OV and SGND. The OV comparator reference is internally set to 1.23V.
LED Current Adjust Input. Connect a resistor R ISET from ISET to SGND to set the
current through each LED string (I LED ) according to the formula I LED = 1512V/R ISET .
Open-Drain, Active-Low Flag Output. FLT asserts when there is an open/short-LED
condition at the output or when there is a thermal shutdown event.
LED String Cathode Connection 2. OUT2 is the open-drain output of the linear current
11
14
OUT2
sink that controls the current through the LED string connected to OUT2. OUT2 sinks
up to 150mA.
12
15
LEDGND
LED Ground. LEDGND is the return path connection for the linear current sinks.
Connect SGND, LEDGND, and PGND at a single point.
LED String Cathode Connection 1. OUT1 is the open-drain output of the linear current
13
16
OUT1
sink that controls the current through the LED string connected to OUT1. OUT1 sinks
up to 150mA.
Oscillator Timing Resistor Connection. Connect a timing resistor (R RT ) from RT to SGND
14
17
RT
to program the switching frequency. Apply an AC-coupled external clock at RT to
synchronize the switching frequency with an external clock source.
15
Maxim Integrated
18
COMP
Switching Converter Compensation Input. Connect an RC network from COMP to SGND
(see the Feedback Compensation section).
9
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MAX16838EVKIT+ 功能描述:LED 照明开发工具 MAX16838 evaluation 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:
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MAX16839ASA+T 功能描述:LED照明驱动器 High-Voltage Linear w/LED Open Detect 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
MAX16839ATT/V+ 制造商:Maxim Integrated Products 功能描述:
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MAX16839ATT+ 制造商:Maxim Integrated Products 功能描述:HIGH-VOLTAGE LINEAR HIGH-BRIGHTNES - Bulk
MAX16839ATT+T 功能描述:LED照明驱动器 High-Voltage Linear w/LED Open Detect 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