MDC3105LT1

http://onsemi.com

8

Designing with this Data Sheet

1. Determine the maximum inductive load current (at

temperature) that the MDC3105 will have to drive

and make sure it is less than the max rated current.

2. For pulsed operation, use the Transient Thermal

Response of Figure 12 and the instructions with it

to determine the maximum limit on transistor power

dissipation for the desired duty cycle and

temperature range.

3. Use Figures 10 & 11 with the SOA notes above to

insure that instantaneous operation does not push

the device beyond the limits of the SOA plot.

determine the max input current needed to achieve

that output current from Figures 2 & 6.

5. For levels of input current below 100

mA, use the

input threshold curves of Figure 4 to verify that

there will be adequate input current available to turn

on the MDC3105 at all temperatures.

6. For levels of input current above 100

mA, enter

Figure 3 using that max input current and determine

the input voltage required to drive the MDC3105

drive source family from those whose dotted lines

cross the solid input characteristic line to the right

7. Using the max output current calculated in step 1,

check Figure 7 to insure that the range of zener

clamp voltage over temperature will satisfy all

system & EMI requirements.

8. Using Figures 8 & 9, insure that “OFF” state

leakage over temperature and voltage extremes does

not violate any system requirements.

9. Review circuit operation and insure none of the

device max ratings are being exceeded.

Figure 13. A 200 mW, 5.0 V Dual Coil Latching Relay Application

with 3.0 V−HCMOS Level Translating Interface

+

74HC04 OR

EQUIVALENT

+

AROMAT

TX2−L2−5 V

GND (2)

GND (2)

74HC04 OR

EQUIVALENT

MDC3105LT1

MDC3105LT1

APPLICATIONS DIAGRAMS