Analog Devices Inc. LT8386 Synchronous Step-Up LED Driver
Analog Devices LT8386 Synchronous Step-Up LED Driver is a monolithic step-up DC-to-DC converter that utilizes fixed frequency and peak current control. The device provides PWM dimming for a string of LEDs. The LED current is programmed by an analog voltage or digital pulses at the CTRL pin. The LT8386 will maintain 2% current regulation through an external sense resistor over a wide range of output voltages.
The LT8386 features Silent Switcher® technology designed to minimize EMI/EMC emissions with high efficiency. The switching frequency is programmable from 200kHz to 2MHz by an external resistor at the RT pin or an external clock applied at the SYNC/SPRD pin. With the optional spread spectrum frequency modulation enabled, the frequency varies from 100% to 125% to reduce EMI.
The Analog Devices LT8386 includes a driver for an external high side PMOS for PWM dimming. The 60V rated LT8386 is pin-to-pin compatible with the LT3922 and LT3922-1.
Features
- 2% LED current regulation
- 2.5% output voltage regulation
- 50,000:1 PWM dimming at 100Hz
- 512:1 internal PWM dimming
- Spread spectrum frequency modulation
- Silent Switcher architecture for ultra-low EMI
- Operates in boost, buck mode, and buck-boost mode
- 4V to 56V input voltage range
- Up to 52V LED string voltage
- Adaptive peak switch current limit up to 5A for low VIN
- 200kHz to 2MHz with SYNC function
- Analog or duty cycle LED current control
- Open/short LED protection and fault indication
- Small 28-lead 4mm × 5mm LQFN package
- AEC-Q100 qualified for automotive applications
Applications
- Automotive and industrial lighting
- Heads Up Display (HUD)/machine vision
Typical Application
Related Development Tool
Analog Devices Inc. DC3008A Demo Circuit for LT8386
The demo circuit is a 60V 3A Silent Switcher synchronous step-up LED driver featuring the LT8386.
Publicado: 2021-07-09
| Actualizado: 2022-03-11