At time t = 1 ms a breakdown starts to take place, the load resistance Rload is shunted by the circuit of the short-circuited discharger D and the connected ballast resistor
The original design was modified to accommodate HBTs with ballast resistors
, and performance was improved slightly.
Thankfully, if cost is of more concern than perfect matching, an inexpensive low-dropout (LDO) linear regulator can provide enough of a benefit to avoid tweaking the ballast resistor
value with each new batch of LEDs.
Unique internal circuitry allows paralleling of multiple LT3086s for higher load current and heat spreading without needing external ballast resistors
Illuminated models that feature bright or superbright LEDs available in blue, white, red, green, or amber, with matching color caps and built in ballast resistors
Bright LEDs are available in red, green and amber, with matching color caps and built in ballast resistors
Several design and production enhancements contribute to the success of the TGH29 line including an HBT unit cell that incorporates integrated emitter ballast resistors
to minimize thermal runaway.
The driver's typical constant current output accuracy of 5%, irrespective of source voltage and LED chain length, is more than sufficient to meet the needs of low cost lighting products, ensuring uniform LED brightness and good inter-lamp matching without the need for ballast resistors