FEATURES
High Efficiency, Eight-String, White LED Driver for LCD Backlight APPLICATIONS
ADD5201 BLOCK DIAGRAM STEP-UP SWITCHING REGULATOR White LED driver based on inductive boost converter Integrated 50 V MOSFET with 2.9 A peak current limit Input voltage range: 6 V to 21 V Maximum output adjustable up to 45 V 350 kHz to 1 MHz adjustable operating frequency Built-in soft start for boost converter Drives up to eight LED current sources LED current adjustable up to 30 mA for each channel Headroom control to maximize efficiency Adjustable output dimming frequency: 200 Hz to 10 kHz LED open/short fault protection Selectable brightness control interface modes PWM input SMBus serial interface Selectable dimming controls Fixed delay PWM dimming control with 8-bit resolution No delay PWM dimming control with 8-bit resolution Phase shift PWM dimming control with 8-bit resolution Direct PWM dimming control DC current dimming mode with 8-bit resolution General Thermal shutdown Undervoltage lockout 28-lead, 4 mm × 4 mm LFCSP EIGHT CURRENT SOURCES INTERFACE 8-BIT DIMMING CONTROL LOGIC Figure 1.
NXP Semiconductors
