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High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
Functional Diagram
IN
V5
DIM
IN
REGULATOR
1 μ A
IN
EN
ENABLE
REFERENCE
GENERATOR
I_ REG
OUT
MAX16836
THERMAL
SHUTDOWN
DIFFERENTIAL
SENSE
AMPLIFIER
CS+
CS-
Detailed Description
The MAX16836 is a high-current regulator capable of
providing up to a total of 350mA of current to one or
more strings of HB LEDs. A wide operating input volt-
age range of +6.5V to +40V makes the MAX16836
ideal for automotive applications. A +5V regulated out-
put provides up to 4mA of current to power external cir-
cuitry. In addition, the MAX16836 features thermal and
output short-circuit protection. The wide operating volt-
age range helps protect the MAX16836 against large
transients such as those found in load-dump situations
up to 40V.
The MAX16836 uses a feedback loop to control the out-
put current. The differential voltage across the sense
resistor is compared to a fixed reference voltage, and
the error is amplified to serve as the drive to the internal
power series pass device (see the Functional
Diagram). The regulation point is factory-set at (V CS+ -
V CS- ) = 200mV ±3.5%. The regulated current is user
defined by the value of R SENSE .
The MAX16836 is a current controller internally opti-
mized for driving the impedance range expected from
one or more HB LEDs.
+5V Regulator
The MAX16836 includes a fixed +5V output regulator
that delivers up to 4mA of load current throughout the
+6.5V to +40V input voltage range. Connect a 0.1μF
compensation capacitor from V5 to ground. Shorting
V5 to ground disables the thermal shutdown. When EN
is low, V5 is off. V5 stays on during PWM dimming,
using the DIM input.
Thermal Protection
The MAX16836 enters a thermal-shutdown mode in the
event of overheating. This typically occurs in overload or
output short-circuit conditions. If the junction tempera-
ture exceeds T J = +159°C (typ), the internal thermal-pro-
tection circuitry turns off the series pass device. The
MAX16836 recovers from thermal-shutdown mode once
the junction temperature drops by 24°C (typ). The part
therefore protects itself by thermally cycling in the event
of a short-circuit or overload condition. Shorting V5 to
ground disables the thermal shutdown.
Applications Information
Programming the LED Current
The MAX16836 uses a sense resistor across CS+ and
CS- to set the LED current. The differential sense ampli-
fier connected across R SENSE provides ground-loop
immunity and low-frequency noise rejection. The LED
current is given by:
I LED = V SENSE /R SENSE
6
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MAX16838ATP/V+ 功能描述:LED照明驱动器 Integrated 2-Channel High-Brightness LED Drivers with High-Voltage DC-DC Controller 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
MAX16838ATP/V+T 功能描述:LED照明驱动器 Integrated 2-Channel High-Brightness LED Drivers with High-Voltage DC-DC Controller 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
MAX16838ATP+ 功能描述:LED照明驱动器 HB w/High-Voltage DC/DC Controller 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
MAX16838ATP+T 功能描述:LED照明驱动器 HB w/High-Voltage DC/DC Controller 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
MAX16838ATT+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
MAX16838AUP/V+ 功能描述:LED照明驱动器 HB w/High-Voltage DC/DC Controller 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
MAX16838AUP/V+T 功能描述:LED照明驱动器 HB w/High-Voltage DC/DC Controller 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
MAX16838AUP+ 功能描述:LED照明驱动器 HB w/High-Voltage DC/DC Controller 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