2 MHZ, high brightness LED drive, integrated MOSFET and high side current detection

High pressure, high efficient LED driver, integrated MOSFET circuit board space and cost saving

An overview of the

MAX16832A/MAX16832C are step-down constant current high brightness leds (HB LED drive, for car internal/external lighting, buildings and environment lighting, LED lights and other LED lighting applications to provide cost-effective solutions.

MAX16832A/MAX16832C work from + 6.5 V to + 65 V input voltage range, in the highest + 125 ° C temperature range can provide maximum output current 700 ma, and at the highest + 105 ° C temperature range can provide 1 a output current. Gao Bianjian flow resistance to adjust the output current, and a dedicated pulse width modulation (PWM) input can achieve wide brightness range pulse type LED brightness control.

These devices are well suited for need wide input voltage range of applications. High edge detection and built-in current setting circuit reduced the number of external components, and provide precision of + / - 3% of the average output current. During load transients and PWM brightness control, hysteresis control algorithm guarantees the excellent performance of input power and rapid response. MAX16832A allow 10% of the current ripple and MAX16832C allows 30% of the current ripple. These two devices switch frequency up to 2 MHZ, which allows the use of small size elements.

MAX16832A/MAX16832C simulated brightness adjustment function, can reduce the output current, through TEMP_I to GND loading all the external dc voltage is lower than the threshold voltage within 2 v to implement this regulation. TEMP_I but also to the connection between TEMP_I &gnd negative temperature coefficient (NTC) thermistor source out 25 mu A current, provide simulation hot turn-back function, when the temperature of the LED string is beyond the specified temperature can reduce the LED current. In addition, the device also has shut off the heat protection function.

MAX16832A/MAX16832C work to 40 ° C to + 125 ° C auto level temperature range, enhanced heat dissipation type 8 pins SO encapsulation.

The key features

Efficient solution

The input voltage range of 6.5 V to 65 V

Output current up to 1 a

On-chip integration of 65 v, 0.45 Ω power MOSFET

Hysteresis control: switching frequency up to 2 MHZ

LED current precision: plus or minus 3%

200 mv galvanometer benchmark

Programmable constant LED current resistance

Integration of the high side current detection

Hot turn-back protect/linear brightness control

Overheating fault protection

Enhanced heat dissipation type 8 pins SO encapsulation

To 40 ° C to + 125 ° C temperature range