Automotive High Accuracy LED Controller with Spread Spectrum Frequency Modulation.
SGM3775Q
SGM3775Q.pdf
SGM3775Q.pdf
No.14088
FEATURES
• AEC-Q100 Qualified for Automotive Applications
Device Temperature Grade 1
TA = -40℃ to +125℃
• 4.5V to 65V Wide Input Voltage Range
• Programmable Switching Frequency
• Support External Synchronized Frequency
• Frequency Spread Spectrum
• External Analog Dimming via IADJ Pin
• External PWM Dimming via DIM/PWM Pin
• Integrated P-Channel Dimming MOSFET Driver
• Flexible External Loop Compensation
• Flexible External Slope Compensation
• Support Boost, Buck-Boost, SEPIC and Flyback Topologies
• Short LED Protection
• Open LED Protection
• Thermal Shutdown
• Fault Indicator
• High LED Current Accuracy (< ±10%) over -40℃
to +150℃ Junction Temperature Range
• Available in a Green TSSOP-20A (Exposed Pad) Package
DESCRIPTION
The SGM3775Q is a peak current mode, asynchronous controller for LED lights. The device supports Boost, Buck-Boost, SEPIC and Flyback configurations to meet multi-purpose applications. The SGM3775Q features a wide 4.5V to 65V input voltage range and supports up to 65V output voltage.
The switching frequency can be set by the RT pin, or it can be synchronized by an external clock signal. The configurable frequency spread spectrum function is available to improve EMI performance.
The SGM3775Q provides both analog dimming and PWM dimming methods to modulate LED current independently. Adjust the IADJ input to set the regulated LED current with over 15:1 contrast ratio, and adjust the DIM/PWM input to get a dimming range over 1000:1. The PDRV output is used to drive an external optional P-Channel MOSFET, which provides the fast response to the PWM signal.
The device provides full protections including LED over-current, output over-voltage, output under-voltage, switch current limit, and thermal shutdown protections. The nFLT open-drain output indicates the logic low when fault occurs. The IMON output provides extra continuous LED current monitor, connecting IMON to external microcontroller for fault detection if necessary.
The device is AEC-Q100 qualified (Automotive Electronics Council (AEC) standard Q100 Grade 1) and it is suitable for automotive applications.
The device is available in a Green TSSOP-20A (Exposed Pad) package.
APPLICATION CIRCUIT
PIN CONFIGUTION
