Page 1
HY6340
Laser Diode Driver
Switchable Constant Current Laser Diode Driver
The HY6340 Laser Diode Driver is designed for
applications requiring high constant current drive for the
operation of laser diodes such as pump sources for
EDFA's and diode pumped semiconductors. The
HY6340 provides selectable drive current from zero to 1
ampere (1.5 amperes with forced air cooling). The
HY5640 includes outputs for monitoring and control of
over-current and laser diode over-temperature conditions.
The HY6340 comes in a 22 pin dual in-line ceramic
package. An aluminum heat spreader is included as a
part of the package for heat sinking the device.
TEC Controllers Laser Diode Drivers Micro-heaters
Features:
✦ Analog input, DC to 1MHz
✦ Adjustable modulation current to 1.5 amps
✦ Patented “backmatched” thermal
management
✦ Enable pin for switching
✦ Overtemp and over-current alarms
✦ Common anode isolated laser diodes
✦ Thru-hole or surface-mount packaging
Figure 1
Figure 2
30 • 400 Hot Springs Road, Carson City NV 89706 • (775) 883-0820 • Fax (775) 883-0827 • www.hytek.com
Page 2
HY6340
Laser Diode Driver
Input Specifications
Power Supply Input (VEE): Pins 9,10, 1 1, 16 –9 to –15V @ 1 amp max. (1.5 amp with forced air cooling)
Drive Enable (EN): Pin 7 VEE (off, disable), Ground or Open (on, enable)
Modulation (MOD): Pin 21 10 to 1000mA for input voltage VEE to (VEE + 3V)
(10 to 1500mA with forced air cooling)
Ground (GND): Pins 18, 19, 20 Power supply ground
Feedback-Optical (FB): Pin 22 FB<MOD increases IOUT, FB>MOD decreases IOUT
VEE < FB < VEE + 5V
Over-T emperature Alarm Input (OTI+): Pin 1 with VEE < OTI+ < VEE + 5V
Over-T emperature Alarm Input (OTI-): Pin 5 with VEE < OTI+ < VEE + 5V
Over-Current Alarm Input (OCI-): Pin 6
T emperature Alarm Hysteresis: Pin 4 Use to increase temperature hysteresis
T emperature Alarm Hysteresis: Pin 3 Use to increase temperature hysteresis
Output specifications
Laser Diode Current Drive (IOUT): Pins 12, 13, 14 0 to 1 amp (1.5 amp with forced air cooling)
Reference Output (VREF): Pin 8 = VEE +5V at < 100mA
Over-T emperature Alarm Output (OT A): Pin 2 VEE (Alarm condition; normally grounded)
Over-Current Alarm Output (OCA): Pin 17 VEE (Alarm condition; normally grounded)
Environmental conditions
Operating T emperature –20°C to +100°C (case)
Storage T emperature –65°C to +150°C (case)
Signal descriptions
VEE Input power supply (–9 to –15 VDC).
GND Ground return for VEE (input power supply)
MOD The modulation voltage programs the laser diode drive current, IOUT. When the input is at VEE the modulation cur-
rent is zero. Maximum modulation current occurs when the voltage at MOD is +5.0 V with respect to the VEE input. The current is set by the voltage at the modulation input.
VREF The Reference voltage is a precision voltage reference with an output voltage of VEE + 5VDC. The Reference volt-
age supplies a voltage for the adjustment of the current. It can also be used to power a resistive bridge input to
the over-temperature alarm, and to provide an adjustable reference voltage to the current alarm input.
EN The Enable pin is used to enable/disable the output. When the Enable pin is connected to ground, or left open,
the output is enabled, allowing current to flow to the laser diode. When this pin is connected to VEE the laser
current is disabled.
IOUT The Output provides drive current to the laser diode (cathode/negative; connect anode to ground).
FB This high input impedance, voltage feedback, input is used with a photodetector to control Output Current.
OTI+ Positive over-temperature alarm input.
OTI– Negative over-temperature alarm input.
OCA Over-current alarm output. Alarm: VEE; No alarm: Ground
OCI Over-current input. OCI controls the set point for the over-current alarm detector. VEE<VOCI< VEE +5V
OTA Over-temperature alarm output. Alarm: VEE; No alarm: Ground
RH Resistor connected between pins 3 and 4 to vary the temperature detector hysteresis from 1 to 10%.
400 Hot Springs Road, Carson City NV 89706 • (775) 883-0820 • Fax (775) 883-0827 • www.hytek.com • 31
Loading...