explain
Lp8861-q1 is a low EMI and easy-to-use automotive LED Driver with integrated boost /sepic converter. The device has
There are four high-precision current traps, which can provide brightness control with high dimming ratio through pulse width modulation (PWM) input signal. The boost /sepic converter can provide adaptive output voltage control based on the LED current well residual voltage.
This feature can adjust the voltage to the lowest level to meet the needs under all conditions, so as to minimize power consumption. Boost /sepic converter supports spread spectrum for switching frequency and external synchronization through dedicated pins. With a wide range of adjustable frequencies, the lp8861-q1 can avoid interference in the amplitude modulated (AM) RF band.
The lp8861-q1 can optionally drive an external p-FET to disconnect the input power supply from the system in case of failure, thereby reducing surge current and standby power consumption. The device can reduce the LED current based on the temperature measured by the external negative temperature coefficient (NTC) sensor to prevent the LED from overheating and delaying
Long service life.
The input voltage range of lp8861-q1 is 4.5V to 40V, which supports vehicle start / stop and sudden load drop. Lp8861-q1 integrates
Rich fault detection and protection functions.
characteristic
• meet automotive application requirements
• have the following results according to aecq100 standard:
– device temperature level 1 ambient operating temperature range: -40 ° C to +125 ° C
• input operating voltage range: 4.5V to 40V
• four high-precision current traps
– current matching degree is 1% (typical value)
– LED string current up to 100ma/ channel
– 10 000:1 dimming ratio at 100Hz
• integrated boost /sepic converter for LED string power supply
– output voltage up to 45V
– switching frequency: 300kHz to 2.2MHz
– switch synchronization input
– spread spectrum reduces electromagnetic interference (EMI)
• power line field FET control can realize surge current protection and standby energy saving
• rich fault detection and Fault Tolerance Features
– fault output
– input voltage overvoltage protection (OVP), undervoltage lockout (UVLO)
And overcurrent protection (OCP)
– open and short led fault detection
– use the external temperature sensor to automatically reduce the LED current
– thermal shutdown
• minimize the number of external components
application
• provide backlight for the following applications:
– car infotainment system
– car dashboard
– smart mirrors
– head up display (HUD)
– central information display (CID)
– audio video navigation (AVN)
