Introduction to drive ICS
The PT6913 chip uses linear constant current to control the output current, the internal set success rate MOS, the output current can be set to 10mA~60mA through the external resistance. PT6913 maximum input voltage up to 400V, using high-end drive mode, to provide LED open circuit,LED short-circuit Protection.
In any case, the excess voltage of the input power supply higher than the LED load is borne by PT6913, and the LED load is not exposed to overvoltage threats, which provides very high reliability and stability for the overall solution.
In order to prevent IC overheating damage, PT6913 integrated temperature compensation function, when the IC internal junction temperature rise to 130 ℃, PT6913 began to reduce the output current, when the junction temperature reached 150 ℃, the output current will be reduced to 0. This avoids the flickering problem of traditional over-temperature protection methods.
How it works ?
The PT6913A/B adopts linear constant current drive technology, and the circuit topology is simple and practical.
LED load, chip and rectifier after the power supply series connection, constitute the current circuit,
output current by the IC set.
When the input voltage is higher than the LED load voltage, the output current is constant, the input voltage exceeds the LED load voltage part by the IC bear, IC maximum input voltage up to 400V, to meet the vast majority of AC input applications.
Features of the programme
5V~400V operating Voltage
5~60Ma can set output current
±5% Output Current Accuracy
Can be used in parallel with multiple ICS to meet large current outputs
High power factor
Efficient
Very few peripheral components
No electrolytic capacitance required
LED Open circuit, short circuit protection
Temperature attenuation function
-TJ "130 ℃, the output current began to decrease;-TJ" 150 ℃, the output current reduced to 0
Temperature attenuation PT6913A/B integrated temperature attenuation function. When the internal junction temperature of the IC is higher than 130 ℃ (typical), the is pin voltage decreases with the 15mV/℃ coefficient, and the output current decreases as a result.
LED Short Circuit protection PT6913A/B uses linear constant current control mode, the input voltage is higher than the output voltage of the excess voltage by the IC to bear, IC input voltage up to 400V.
When a short circuit of a part of the LED, the voltage of the IC will increase, resulting in increased IC power consumption, IC temperature rise, if the IC internal junction temperature is still less than 130 ℃, the output current will remain constant.
The worst case scenario is LED load positive end and negative end short circuit, all input voltage is borne by IC, IC internal junction temperature will rise sharply to 150℃,IC off output.
Obviously, LED short-circuit protection is achieved by temperature attenuation.
Scope of application
LED Bulbs
LED Lamp
Compact LED Lighting Products
CHONDA group hope this LED Driver Solution - Isolated High Voltage Solution will help your work in the near future.