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MX841
IXYS
AC Electrical Characteristics
V DD =3.0V, R SENSE =5 ? ; V CTRL =1.0V, L=6.8μH; C BYP =1μF, T A = -40 o C to +85 o C, Typical Values at +25 o C
Unless otherwise specified
Parameter
Oscillator Frequency
Condition
Min
0.6
Typ
1.0
Max
1.3
Unit
MHz
Duty Cycle
Pin Description
72.5
%
Pin No.
1, 4
2
3
5
6
7
8
Pin Name
SW
Analog GND
Switch GND
VDD
OVD
CTRL
Isense
Description
Power Switch. Connects the drain of the internal high voltage N-channel
MOSFET to the Inductor and Schottky Diode to generate the LED boost
voltage. This voltage is determined by the total forward bias voltage of the
LED series string and the Isense resistor value. (Note: Both pins must be
connected.)
Analog Ground (Note: Must be connected to a low noise ground source.)
Switch Ground (Note: Must be connected to a high current ground source.)
Input supply pin. Input range from 1.1 to 5.5 volts. Must be bypassed with a
low ESR capacitor to GND.
Over Voltage Detect input. Compares the LED boots voltage to the internal
voltage reference. If the boost voltage rises above 22V the OVD circuit
disables the oscillator and N-channel MOSFET until the boost voltage falls
below 18.5V. Must be bypassed with a low ESR capacitor to GND.
Shutdown and Intensity Control Input. A control voltage above 260mV
enables device operation. A control voltage below 100mV disables device
operation. LED intensity is linearly adjusted with voltages between 260mV
and V DD .
Current Sense Input. The LED bias current is set by connecting a carbon
composite or monolithic resistor from this input to Ground. I SENSE regulates
this current to 1/13 of the CTRL input voltage.
MX841
Drawing No. 17023
3
Preliminary
03/10/05
www.ixys.net
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