LD24BC Series - Contant Current LED Driver Board with Analog & PWM Control

is a highly effective continuous Step-Up converter optimized for managing one COB LED or string up to 10 High Power LEDs from a wide input range of 8V to 36V DC , nominal at standart 24V pover source. Control algorithm allows highly efficient and accurate control of COB LED or power LEDs . Depending on the components assembled on to board, supply voltage and confi- guration unit can provide up to 35 watts of output power . The device has a Two special entries ADIM and PWM to manage output. Depending on the input circuit allows to realize analog or digital version dimming ( Dimmer). Applying a voltage from 0.2V to 1.2V on the input ADIM you can control output current from 0% to 100 % of output current. A digital PWM signal on the PWM input control either directly or using a transistor with open collector ( OC ) and management of the microcontroller. To avoide visible flicker, the PWM signal should be greater than 100Hz (>200 Hz is recommended). Permanent applied voltage of 0.3 V or lower the EN input turns out to state and switches off the device from the current state to the low-power standby mode. Left open if not used.

Also suitable to mobile lighting system .

Specification

Model No.	LD24BC-xxx
Device Design	Constant Current, DC/DC Boost LED Driver	Efficiency 95%
Input	8V - 36VDC, 24V nominal	without protection
Output	13V - 42VDC, ask for max 60V VDC	One COB LED, or 10 HP LED
	Current Accuracy	+/- 5%
	Current Stability	+/- 5%
	Output Power	3 - 35 W
	Protection	regulated at Rated OUT Current
Functions	Remote ON/OF Control	Enable Input
	Analog Dimming	O.2V DC to 1.2V DC for 0% - 100% of Current Range
	PWM Dimming	0.1 - 100 kHz, max 0-5V DC
Enviromental	Operating Temperature	-40 C to + 85 C
	Storage Temperature	-55 C to + 125 C
	Humidity	95%
	Cooling	Free Air Convention
Feature	Dimension (L*W*H)	30.0*25.0* 5.4 mm
	Pins Pitch	125 mil
Programming	NO	current set at the factory
Functionatity	Assembled, Tested	ready to use
Suitable for COB	Citizen, Cree, Bridgelux, Philips, Osram, Seoul, ...	Uled = 32V - 40V
Produced	in Slovakia	ELPEK Electronics

Analog Dimming Application		For more information	LD24BC Series Datasheet

Connection Notes:

1.    The input components (C1, L1,L2, C2, C3) are used to meet the conducted emmissions requirements of EN 55022 class B. Components values may need to be changed slightly depending upon application variables.
2.    To comply with EN61000-4-5, a TVS should be instaled before the input filter components. The TVS max. clamping voltage (@ max peak pulse current Vc) must be less 38V.
3.     As showns in the table ( Analog Dimming ) above, the output current of the unit can be set by adjusting voltage level on the ADIM input to a value between 0.2V and 1.2V (Iout will vary from 0% to 100% of rated output current. Care must be taken not to exceed 5.0V on this input. Value larger than this level may be damage the driver. In the circuit above, the voltage level at the ADIM input is set by a simple resistor network (R1, R2, R3). The regulator(Z1) defined the voltage across R2 and R3 and will be less that 1.2V. The value of R1 is given for a 24V input

PWM Dimming Application		For more information	LD24BC Series Datasheet

Connection Notes:

Driving the PWM input via open collector transistor
   The diode and integrated resistor suppress possible high amplitude negative spikes on the PWM input resulting from the drain-source capacitance of the transistor. Negative spikes at the input to the device should be avoided as they may cause errors in output current, or erratic device operation.

   Another possibility is to drive the device from the open drain output of a microcontroller.

If you have questions regarding this product, feel free to contact us.