Maxim's MAX16836 is a current regulator that operates from 6.5V to 40V and can drive one or more strings of high-brightness LEDs (HBLEDs) with a total current of 350mA. This article will mainly introduce the main features of the MAX16836, functional block diagrams, and PWM dimming multiple HB Led Driver circuits.
The main features of the MAX16836 are as follows:
+6.5V to +40V operating voltage range Adjustable LED current (35mA to 350mA)
±3.5% output current accuracy High-voltage DIM pin for brightness control interface Built-in tuning element with very low dropout voltage (0.55V typical)
4mA current source output +5V regulator Parallel operation LED current > 350mA
Differential LED Current Sense Low Shutdown Current (typically 35μA)
200mV low current detection reference reduces power loss. Edges of waveform shaping reduce EMI emissions during PWM dimming
Thermal Shutdown Output Short-Circuit Protection Available in a tiny, thermally enhanced, 5mm x 5mm, 16-pin TQFN package -40°C to +125°C operating temperature range
2. Functional block diagram of the MAX16836
         The functional block diagram of the MAX16836 is shown in Figure 1. It consists of an enable module, a reference signal generator, a voltage regulator, a thermal shutdown, a differential sense amplification, and a current regulation module.
Figure 1: Functional Block Diagram of the MAX16836
Three. MAX16836 application circuit diagram
       The LED current of the MAX16836 is adjustable from 35mA to 350mA with an LED current accuracy of ±3.5%. The high-voltage DIM pin is used for the dimming interface. The parallel operation can make the LED current greater than 350mA, the differential LED current detection, and the shutdown current is 35uA. A typical PWM dimming multi-HB LED driver circuit application diagram is shown in Figure 2:
Figure 2: PWM dimming multiple HB LED driver circuit application diagram In Figure 2, if you do not need to use PWM control to adjust the output LED current, you can also connect the DIM pin to the input and enable pins. In addition, the MAX16836 uses the ICM7555's PWM dimming connection diagram as shown in Figure 3. Its LED current is as follows:
Figure 3: PWM dimming connection diagram of the MAX16836 using the ICM7555 Â Â Â Â Â Â Â Â Â Summary Maxim's MAX16836 is primarily used in automotive interior lighting, automotive exterior lighting, ambulance warning lighting, navigation and marine lights, and general lighting, as well as multiple HB LED driver circuits for LCD backlighting. With the development of LED technology and the decline in LED prices, the MAX16836 will be further widely used. (Edit: Technology) LED Drivers,High Quality LED Drivers,LED Drivers Details, Shenzhen Huayueke Technology Co., Ltd. HAURUI LIGHTING CO.,LTD , http://www.huaruileddriver.com (assuming Irt<