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SC5014EVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC5014EVB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 34 page  POWER MANAGEMENT SC5014 High Efficiency 4-Channel HB LED Driver with I2C Interface and Phase-Shifted PWM Dimming Revision 2.0 Features Input Voltage — 4.5V to 27V Output Voltage — Up to 50V Step-up (Boost) Controller Ultra-Fast Transient Response (<00μs) Programmable Switching Frequency Linear Current Sinks 4 Strings, up to 20mA/String Current Matching ±% Current Accuracy ±2% PWM Dimming String-by-String Phase Shifting Input Dimming Frequency 00Hz-30kHz User Selectable 9 or 0-Bits Dimming Resolution 5-Bits Analog Dimming I2C Interface Fault Status — Open/Short LED, UVLO, OTP Device Control: PLL Setting Protection Features Open/Shorted LED(s) and adjustable OVP Over-Temperature and UVLO Shutdown Protection 4mm X 4mm 20-pin QFN Package Applications UltrabooksTM, All-in-One PCs, Monitors, Automotive- Display Backlighting Backlighting for Mid-Size Displays Description The SC504 is a 4-channel, highly integrated, high-effi- ciency step-up (boost) HB LED driver designed to reduce the thickness of mid-size LCD displays. It features a wide input voltage range (4.5V to 27V), phase-shifted PWM dimming, analog dimming, a flexible output configura- tion, an I2C interface, and numerous protection features. The SC504 exhibits 2% to 4% higher efficiency when using the same size inductors as existing LED drivers. But, unlike existing devices, it can also operate with inductors that are up to 0x smaller without sacrificing efficiency. This part can also use very low-profile inductors (as small as 2.2µH, mm height), which allows LED drivers to be built directly into the LCD panel to enable ultra-thin displays. The boost controller, with programmable switching fre- quency from 200kHz to 2.2MHz, maximizes efficiency by dynamically minimizing the output voltage while main- taining LED string current accuracy. It provides excellent line and load response with no external compensation components. An external resistor adjusts the current from 20-20mA per string. It also features PWM dimming reso- lution of 9 or 0-bits (user selectable) over a dimming fre- quency from 00Hz to 20kHz, synchronized to the boost oscillator. String-by-string phase shifting reduces the demand on the input/output capacitance, decreases EMI, and improves dimming linearity. UVLO E-PAD ISET FSET CPLL SCP SC5014 R3 R6 FLT C3 REF FLT VCC PGND R11 R7 C4 R10 R1 R2 OVP IO4 R9 R8 VIN=4.5to27V Upto 120mA/String IO1 IO2 IO3 C5 R5 PWMI PWMI SDA SCL ForI2C EN EN L1 Q1 R4 NDRV CS D1 VOUTupto50V VCC=4.5to5.5V Typical Application Circuit |
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