Summary:
MH94xx internal integration control, automatic temperature compensation when chip internal temperature over 130 degrees, the LED output current decreases with temperature rise, until the internal temperature of the chip to rise to 150 degrees, the LED will eventually stabilize output current in 40% of the set values, can effectively avoid the LED low frequency,
Features:
Working voltage: 6 v ~ 55 v
With automatic temperature compensation control
PWM and analog dimming (dimming voltage range: 0.5 V ~ 2.5 V)
Plus or minus 3% output constant current accuracy
Built-in LED open circuit and short circuit protection
Soft start time adjustable
Packaging: SOT23-6, SOP8
Recommended applications:
LED car headlamps, low voltage LED lamp, LED industrial lighting
Typical circuit diagram:
Foot a definition:
Soft start mode:
By outside access a capacitor in the DIM the feet, make the system startup DIM feet slowly rising voltage, this LED output current is also slowly rising, so as to realize the soft start, usually, soft start time and the size of the external capacitance relationship about 100 us/nF,
Load current thermal compensation:
High brightness LED sometimes need to provide the output current temperature compensation to ensure stable and reliable work, MH94xx can DIM/external thermistor NTC foot of negative temperature coefficient (NTC) or close to the LED diode, testing the temperature of the LED lights so as to adjust the output current of the LED load,
External set current attenuation temperature:
MH94xxB/MH94xxC a NTC thermistor NTC input pin can be external linkage to monitor the environment or lights, temperature, output current can be set up began to maintain temperature, temperature and decay, as shown in the typical application circuit diagram can be realized by changing the Rt1 and Rt2 resistance value,
Shenzhen Ming and grind xiang technology co., LTD.
Huang Sheng Tel: 13434351036
QQ: 3341254367