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Atmel LED Driver-MSL1060

6-string PWM LED Driver with Digitally Compensated, 1.1MHz,

48V Boost Regulator and ±1.5% LED String Current Balance

Datasheet

Summary of content (20 pages)

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Atmel LED Driver-MSL1060 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator and ±1.
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Atmel LED Driver-MSL1060 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator and ±1.5% LED String Current Balance General Description The Atmel LED DriverMSL1060 is an LED driver with integrated boost regulator capable of driving 6 LED strings at 30mA up to 48V for lighting applications to 8W. In a typical backlighting system it can drive up to 72 white LEDs. ® The MSL1060 incorporates a current mode PWM boost regulator with 50V internal switch and a wide, 4.
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Atmel LED Driver-MSL1060 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator and ±1.5% LED String Current Balance Key Features • Drives 6 Strings of up to 12 LEDs per String • ALS Interface for Automatic Brightness Setting • Drives 72 White LEDs at 30mA for 8W Power • Temperature Sensor Interface for Temp Derating • Better than ±1.5% String Current Accuracy • Individual O/C and S/C String Fault Detection • 4.
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Table of Contents Quick Start Guide………………………………………………………………………………………………………………………………………………………………5 How Many LEDs Can Be Driven by the MSL1060/61/64…………………………………………………………......................................................................5 Differences between MSL1060, MSL1061 and MSL1064………………………………………………….…………….............…......................................5 Capabilities With and Without Using the Serial Interface…………………………………………………………………………………………………..........
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Atmel LED Driver-MSL1060 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator and ±1.5% LED String Current Balance Quick Start Guide This section summarizes the capabilities of, and differences between, the MSL1060 and the similar Atmel MSL1061 and Atmel MSL1064 with I²C interfaces. The MSL1060 and MSL1061/64 are LED string drivers with integrated boost regulators, which power, monitor, and dim multiple LEDs at high efficiency for backlighting and signage applications.
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Table 1. Atmel LED Drivers-MSL1060, MSL1061, and MSL1064 Comparison FEATURE MSL1060 MSL1064 MSL1061 I2C interface Not available 1 fixed slave address (0x62) 4 selectable slave addresses by AD0 (0x60, 0x61, 0x62, 0x63) Package 24-lead, 5mm x 5mm TQFN, 0.65mm pitch 28-lead, 5mm x 5mm TQFN, 0.5mm pitch Capabilities With and Without Using the Serial Interface The MSL1060/61/64 operates as standalone LED drivers with full digital (PWM) and analog (DAC) LED dimming control and fault reporting.
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Atmel LED Driver-MSL1060 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator and ±1.5% LED String Current Balance Packages and Connections VIN EN N/C SW SW N/C Atmel LED Driver-MSL1060 - 24 lead, 5mm x 5mm x 0.75mm TQFN package with 0.65mm lead pitch 24 23 22 21 20 19 VCC 1 18 OVP VDD 2 17 STR0 TEST1 3 16 STR1 TEST2 4 MSL1060 15 STR2 TEST3 5 (TOP VIEW) 14 STR3 TEST4 6 Figure 1. 24 – lead, 5mm x 5mm x 0.75mm TQFN (0.
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Connection Descriptions Table 3. Connection Assignments NAME 8 MSL1060 DESCRIPTION VCC 1 6V internal linear regulator output VCC powers the internal power FET switch driver. Bypass VCC to GND either with a 10µF or greater ceramic capacitor. If the voltage at VIN is less than 6.5V, connect VCC directly to VIN to bypass the internal linear regulator, and power the driver directly from VIN VDD 2 2.85V internal linear regulator output VDD powers internal logic Bypass VDD to GND with at least a 4.
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Atmel LED Driver-MSL1060 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator and ±1.5% LED String Current Balance NAME MSL1060 DESCRIPTION OVP 18 Overvoltage detection input Connect to a resistive voltage divider from the boost output voltage to OVP to set the overvoltage protection set point.The OVP threshold is 1.28V N/C 19 No internal connection. Leave unconnected SW 20, 21 N/C 22 No internal connection.
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Electrical Characteristics (Circuit of Figure 16, VVIN = 12V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C) (Note 1) PARAMETER CONDITIONS AND NOTES MIN TYP MAX UNIT DC ELECTRICAL CHARACTERISTICS VIN operating supply voltage VVIN = VVCC 4.75 6.5 V VCC unconnected 6.5 36 V VIN quiescent supply current VEN = 3V, VPWM = 0V VIN shutdown supply current VEN = VPWM = 0V VVIN = 12V 4 14 mA VVIN = 6V, VVCC = 6V 4 14 mA 1 4 10 µA 5.6 6 6.
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Atmel LED Driver-MSL1060 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator and ±1.5% LED String Current Balance PARAMETER CONDITIONS AND NOTES MIN TYP MAX UNIT DC ELECTRICAL CHARACTERISTICS - LOGIC I/OS EN logic high input voltage 2.3 V EN logic low input voltage EN logic input current VEN = 3V EN logic input series resistance Between EN input and internal Zener clamp EN logic input Zener clamp PWM logic high input voltage V 20 µA 10.5 kΩ 5.
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Typical Operating Characteristics (Circuit of Figure 16, VIN=12V, 6 strings of 10 LEDs per string, TA = +25°C, unless otherwise noted) Figure 3. System Efficiency Vs LED Duty Ratio Figure 6. Operating Current Vs VIN Figure 4. LED Current Vs PWM Duty Ratio Figure 7. Figure 5. Shutdown Current Vs VIN Figure 8.
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Atmel LED Driver-MSL1060 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator and ±1.5% LED String Current Balance Typical Operating Characteristics (continued) Figure 9. IADJ Response Figure 12. Open-circuit LED String Response VOUT VFLTB VSW Figure 10. PWM Operation; Minimum D time Figure 13. PWM Operation; FPWM = 200Hz, D =10% Figure 11. PWM Operation; Minimum Off Time Atmel LED Driver-MSL1060 Figure 14.
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Block Diagram VIN 24 VCC 1 VDD 2 FLTB 8 PWM 7 IADJ 11 ILED 10 Figure 15.
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Atmel LED Driver-MSL1060 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator and ±1.5% LED String Current Balance Typical Application Circuit 4.7 Figure 16. Backlight Example Driving 60 White LEDs Table 4. Typ. Application Circuit Parameters PARAMETER Table 5. Typ. Application Circuit Bill of Materials VALUE COMPONENT 4.75V C4, C5, C6, C7* 30V C2 10µF, 10V, X7R or tantalum (see note) Number of LEDs 60 C3 33µF, 35V, X7R Number of LED strings 6 C1 4.7µF, 6.
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Detailed Description The MSL1060 is an integrated boost regulator plus LED driver solution for driving an array of LEDs with up to 8W of power. The MSL1060 is especially suited to drive up to 72 white LEDs for notebook computer backlighting. It is also suitable for industrial lighting and signage applications, and can for example drive a 6 string x 18 series LED array, totaling 108 red LEDs (2.5V LED forward voltage drop).
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Atmel LED Driver-MSL1060 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator and ±1.5% LED String Current Balance Boost Regulator Fault Management The MSL1060 includes a built-in boost regulator that supplies voltage to the LEDs. The boost output voltage ranges from the input voltage up to 48V. The boost regulator generates the voltage at the top (anode end) of each parallel LED string (Figure 15, Figure 16) anywhere between the boost input voltage and 48V.
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Application Information VCC and VDD Regulators Setting the Full-scale LED String Current - R5 The MSL1060 includes two linear voltage regulators to generate the internal voltage rails, VDD and VCC. The regulators allow the same higher voltage supply, VIN, which supplies the LED boost regulator to power the MSL1060 internal circuity. Only use the VDD and VCC regulators to power the MSL1060’s internal circuitry; do not draw any external current from the regulators.
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Atmel LED Driver-MSL1060 6-string PWM LED Driver with Digitally Compensated, 1.1MHz, 48V Boost Regulator and ±1.5% LED String Current Balance IADJ Input - LED Temperature Compensation and/or Ambient Light Sensing To select inductor use the following equations The MSL1060 analog control input, IADJ, allows reduction of the full-scale static LED current from the current set by resistor R5. IADJ controls the LED current proportionally to the voltage on IADJ, between 0V and 1.22V.
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Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: (+1)(408) 441-0311 Fax: (+1)(408) 487-2600 www.atmel.com Atmel Asia Limited Unit 01-5 & 16, 19F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong, Kowloon HONG KONG Tel: (+852) 2245-6100 Fax: (+852) 2722-1369 Atmel Munich GmbH Business Campus Parkring 4 D-85748 Garching b. Munich GERMANY Tel: (+49) 89-31970-0 Fax: (+49) 89-3194621 Atmel Japan 9F, Tonetsu Shinkawa Bldg.