Unless otherwise noted Vin = 12.00 Volts DC, Ta = 25 oC and unit has been running for 5 minutes.
Control Input Bias Current
Input voltage to the inverter. The two pins should be connected for optimum reliability and efficiency.
Inverter ground. The four pins should be connected for optimum reliability and efficiency.
Analog voltage input to the onboard pulse width modulator. Decreasing this voltage increases the ON
time of the onboard PWM resulting in increased brightness. The inverter is full ON when this voltage is
near inverter ground.
Inverter Enable. Pull this pin low to disable inverter operation. This pin must be high to enable the
inverter. The onboard PWM is always utilized.
The DMD series of inverters is designed to power up to four cold cathode fluorescent lamps. An external analog
control interfaces with an onboard pulse width modulator to provide dimming control. The DMD inverter can reliably
dim to less than 5% duty cycle.
External shutdown of the inverter is accomplished using the Enable pin. Pulling this pin low (below Vthoff) disables
the inverter. Enabling the inverter is accomplished by pulling this pin high (above Vthon).
If analog voltage dimming is required, the analog voltage is applied to the Control pin. Figure 1 shows how to
connect the inverter for onboard PWM operation. Graph 1 shows the relationship of PWM duty cycle to input control
If an external PWM is used, connect the Enable pin to the PWM source and connect the Control pin to inverter
Ground. If the onboard PWM is used, connect the analog voltage to the Control pin.
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