R1208 Series
PWM Step-up DC/DC Converter for White LED

Download Datasheet

  • Description

    The R1208 Series are PWM step-up DC/DC converters for white LEDs. The R1208 includes an under voltage lockout circuit (UVLO), an overvoltage protection circuit (OVP), a thermal shutdown protection circuit, and current drivers for four white LED channels. By simply using an inductor, a resistor, capacitors and a diode, white LEDs can be driven with constant current and high efficiency. The LED current can be determined by the value of current setting resistor. The brightness of the LEDs can be adjusted quickly by applying a PWM signal (200 Hz to 300 kHz) to the CE pin. A 2.7-mm x 3.0-mm square compact DFN(PL)2730-12 package is available.

  • Spec
    Input Voltage Range 2.7 V to 22.0 V (24 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 600 µA
    Standby Current Typ. 1.5 µA
    Output Voltage Range Externally Adjustable: Max. 42 V
    Driver ON-resistance Typ. 0.28 Ω
    Oscillator Frequency Typ. 750 kHz / 450 kHz
    Maximum Duty Cycle 95% (750 kHz) / 97% (450 kHz)
    Package DFN(PL)2730-12
    LED電流精度 ±3% (Ta = 25°C)

    Protections / Functions

    TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust
  • Technical
    • Typical Application

      Typical Application

    • R1208x312B Efficiency vs. Output Current / 6LED × 4 Strings

      R1208x312B Efficiency vs. Output Current / 6LED × 4 Strings

    • Related Links

      • Prime Designer

        Online Design Tool

        Registration to myNISD is required to use some of the functions, such as simulations.

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  • Quality &
    • Refer to the datasheets for the details on the product.
    • The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

Download Datasheet

Functional Description

TSD Thermal Shutdown Function
ILX LX Current Limit Function
OCP Overcurrent Protection
OVP Overvoltage Protection
UVLO Undervoltage Lockout Protection
OVLO Overvoltage Lockout Protection
Reverse Reverse Current Protection Circuit
Shutdown Shutdown Function
Soft Start Soft Start Function
SSCG Spread Spectrum Clock Generator Function
PGOOD Power Good Output
Auto Discharge Auto Discharge Function
Anti-ringing Anti-ringing Switch Function
Sequencing Start-up Sequencing Control
Max Duty Maximum Duty Cycle
Ext. Phase Externally Adjustable Phase Compensation
LED Adjust LED High-speed Dimming Control

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