Datasheet

ILD4035
350 mA Step Down LED Driver
Product Brief
Data Sheet 9 Revision 2.0, 2011-08-17
2 Product Brief
The ILD4035 is a hysteretic step down LED driver IC for general lighting applications, which is capable to drive
high power LEDs with average currents up to 400 mA.
The IC incorporates a wide input voltage range and an internal power switch. The output current level can be
adjusted with an external sense resistor.
According to the multifunctional control pin the IC can be switched on and off by an external signal, which is also
suitable to regulate brightness of the LEDs by PWM or analog voltage dimming.
Depending on the value of the switching inductor the switching frequency and the voltage ripple can be set.
The precise internal bandgap stabilizes the circuit and provides stable current conditions over temperature range.
To ensure a long lifetime of the LED system, the ILD4035 incorporates an overvoltage and an overcurrent
protection.
In addition, the integrated thermal protection will reduce the output current to protect the LEDs and the IC against
thermal stress.
Figure 1 Block Diagram
ILD4035_ Block diagram.vsd
6
5
43
2
1V
S
GND
EN /
PWM
V
sense
GND
V
switch
ILD4035
Buck LED Converter
I / V
Vref
Vstab
Vstab
Vstab
Vstab
Vstab
Over Cur r ent Protecti on
TPC
Over Voltage Pr otection