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What are the unique characteristics of Macroblock's 8 bit and 16 bit LED drivers? |
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| Considering the current-mode control characteristics of LEDs, Macroblock's 8-bit and 16-bit LED drivers provide customers with stable and uniform constant current. Through these drivers, LEDs are driven with the best performance and lifetime. |
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What are the potential applications for these drivers? |
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| There are possible various applications. Typical examples may be seen in the indoor and outdoor LED displays, LED message boards or LED moving signs for banks, stock markets, hospitals, clinics, railways, highways, airports, gyms,...etc. |
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What is the advantage of using Macroblock's LED drivers? |
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| With using the Macroblock's LED drivers, the design and manufacturing of LED displays become easy, lower cost, and reliable, since very few external components are needed. More importantly, the maintenance is easy and would not cost a lot. |
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How to control the LED current while using the MBI's LED drivers? |
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| Customers only need one external resistor for each LED drivers to control the current of all output channels. Pin #15 is for 8-bit LED driver to connect the R-ext, while it is pin #23 for 16-bit LED driver. |
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Is there any difficulty in using Marcoblock's LED drivers if customer's original design is for constant voltage LED drivers? |
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| Compared to the voltage mode LED driver, MBI's LED driver provides constant current, and controls the LED current easily. Customers are encouraged to use 8-bit or 16 bit LED drivers for easy manufacturing and lower cost. Customers need to re-wire the PCB board while changing from the constant voltage mode LED driver. Customers may consult with MBI's FAE team if customers have any difficulty in designing the PCB board. |
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Is there any difficulty in using Macroblock's LED drivers if customer's original design is for Toshiba's LED drivers? |
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| Macroblock's LED drivers are fully pin and pitch compatible with Toshiba's 8-bit(TB62705CFN/CP) and 16-bit(TB62706BN/BF). There is no need for PCB modifications. Customers can use the LED drivers very easily. Only external resistors may need to be changed. |
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What are the main characteristics of Macroblock's LED drivers? |
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1. Constant output current invariant to load voltage change(  :<±0.1 %)
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Excellent output current accuracy
between channels: < ±3% (max.)
between ICs: < ±6% (max.)
3. Output current adjusted through an external resistor
4. Fast response of output current
5. 25MHz clock frequency
6. Schmitt trigger input for noise immunity 3-5V supply voltage
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How to control the LED current while using Macroblock's LED drivers? What is its advantage? |
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| Only one external resistor is required for LED driver to control the current of all output channels. Compared with the way of attaching one resistor to each pin, this way can ease the manufacturing process, simplify the process of preparing and purchasing materials and thus decrease the cost. |
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Will it be helpful to add a heat sink against the heat generated from power dissipation? |
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| Yes. To add a heat sink is a solution to power dissipation. This method also applies to various brands of IC to solve the heat problem. |
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Does Marcoblock's LED drivers pass the reliability test? |
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MBI LED Drivers process severe quality control tests.
<MBI R&D => Wafer in TSMCT Assembly => Test and Verification => Reliability Test>
Product Reliability
1. High temp. operating life test (HTOLT) (125°C/6V/1000hrs) dynamic stress
2. High temp. bias life test (HTBLT) (125°C/6V/1000hrs) static stress
3. Low temp. operating life test (LTOLT) (-30°C/6V/1000hrs)
Package Reliability
1. Pre-condition test (TCT/bake/seak/IR re-flow)
2. Pressure cooker test (PCT) (121°C/100%RH/168hrs)
3. Highly accelerated stress test (HAST) (130°C/85%RH/168hrs)
4. Temp. cycle test (TCT) (-65°C~150°C/1000cycles, 15min/cycle)
5. High temp. storage life test (150°C/1000hrs)
Process Reliability
1. ESD test (human body mode/machine mode) (2KV/200V)
2. Latch-up test (I>100mA)
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Can users adjust current only by Rtrim, not by Rext, when MBI5026 are connected in parallel?
If the answer is yes, can MBI5026 still remain constant current? |
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We suggest users still attach one additional resistor, Rext ,to each MBI5026 and MBI5026 can thus achieve excellent performance.
When ICs are connected in this way, no companies would suggest users to use only one external resistor shared by all ICs to adjust current.
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