1 Introduction
The MAX16801A/B and MAXl6802A/B use a constant current to drive the HB LEDs in general lighting and display applications to provide the required control. The MAX16801A/B is suitable for general purpose AC input LED drivers, while the MAX16802A/B is specified for low voltage (10.8 to 24 V) DC input LED drivers. The HB LED driver circuit control IC consisting of MAX16801A/B and MAX16802A/B is mainly used in LCD TV and LCD monitor RGB backlighting, commercial and industrial lighting, decorative and architectural landscape lighting.
2 main features
The main features of the MAX16801A/8 and MAX16802A/8 are as follows:
Suitable for use as a Buck, Boost, Flyback, SEPIC and other circuit topologies; output power up to 50 W or more; internal error amplifier with 1% accuracy; PWM or linear dimming; 262 kHz (1±12%) fixed switching frequency operation; provides thermal shutdown and digital soft-start, programmable input startup voltage; startup supply current is typically 45μA, operating supply current is typically 1.4 mA; thin 8-pin μMAX Package.
3-pin function and internal structure
The pinouts of the MAX16801A/B and MAX16802A/B are shown in Figure 1.
Figure 1: Pinout
Table 1 lists the functions of their individual pins.
Table 1: Function Table of Pins
The MAX16801A/B and MAX16802A/B integrate a 1.23 V bandgap reference, digital soft-start, UVLO, voltage regulator, 262 kHz oscillator, error amplifier, CPWM comparator, current limit comparator, thermal shutdown, and MOS gate Unit circuit such as driver, as shown in Figure 2.
Figure 2: Functional Block Diagram